Home

Frye 7000 Hearing Aid User Manual

1. 1 kHz gt 2 4 Source 60 dBSPL Use UP DOWN to select test level Use M1750E and HA coupler Press START to run test at selected curve Press MENU for local menu Fi F2 F4 F5 Fe Left Ear 1 Delete Composite OFF Prey 2003 05 29 Select Cru Select On Off Curve s Srce Select Auto Test Toggle derigr24 Figure 3 4 8 Measuring intermodulation distortion Basic Sound Chamber Tests 77 3 4 9 Battery Current Drain You can measure the battery current drain in the Coupler screen if you use battery pills instead of regular batteries in the hearing aid while performing your measurements To turn on the battery current drain measurement in the Coupler screen Li Set up the hearing aid in the sound chamber for testing You must use a FONIX battery pill to test for current drain Press the appropriate battery button inside the sound chamber Close the lid of the sound chamber and latch it Press MENU in the Coupler screen Use v a to select Battery Meas under Misc Settings You can use START to skip between groups of selections Use gt to turn ON the Battery Meas Use v to select Battery Size and use lt gt to select the hearing aid s bat tery size Press EXIT to return to the Coupler screen You should now see the bat tery current drain measurement below the Curve Characteristics box See Figure 3 4 9 Start a frequency response measurement to display the battery current
2. Source Composite ANSI Weighted Chamber Leveled Projected Noise Reduction 4k 1 kHz 2 4 Source 70 dBSPL Use UP DOWN to select test level Use MI750E and HA coupler Press START to run test at selected curve Press MENU for local menu FL F2 F5 F Fe Left Ear 1 Composite off OFF Prev 2003 05 29 Select Cru Select On Off Curvets Src Select Auto Test Toggle 12235215 Figure 2 3 2 3 Comparison of the ICRA shape and the ANSI shape 2 3 2 4 Composite type There are two types of the traditional Composite signal available on the 7000 test system They are known as Standard and Chirp The two signals differ in the manner that their phase is generated and this difference has an impact on the crest factor of the signals The crest factor of a waveform is the ratio of its highest amplitude to its RMS amplitude Human speech is often referred to as having a 12 dB crest factor For the needs of most clinicians the Standard and Chirp Composite signal are virtually identical The Standard Composite signal is composed of 79 different individual frequen cies that are each generated with a random phase pattern that results in the signal having a crest factor of 10 dB close to the crest factor of human speech If the phase components were not randomized or otherwise changed and if all the signal components were in phase the crest factor of the signal would increase to over 19 dB The Standard
3. 5 2 2 Running ANSI 92 1 Level the sound chamber and set up the hearing aid to full on gain as spec ified in Section 5 1 1 and 5 1 2 Press F4 in the Opening screen to enter the ANSI 92 screen Use F1 to select the desired ear Use F2 to select the settle time used for the test Use F3 to set the noise reduction used for the test See Section 2 3 2 1 for more information on composite noise reduction 6 Press START to begin the test sequence ao Fr WwW N 118 FONIX 7000 Hearing Aid Analyzer For some aids the analyzer will pause the test and tell you to turn the aid down to reference test gain Adjust the volume of the aid until it comes within 1 dB of the target gain Take care not to move the aid from its position If you must move it in order to adjust the gain control replace as close as possible to its original position Push START to complete the test To delete the displayed results press F4 and use v a to select DELETE ALL CRVS Press gt to perform the deletion 5 2 3 Viewing ANSI 92 Results 1 2 Family of composite gain curves made at 50 60 70 80 and 90 dB SPL NSPL90 Maximum RMS output sound pressure level SPL produced with a 90dB RMS speech weighted noise input SPL signal Full On Noise Gain Maximum RMS gain with a 60dB SPL noise input sig nal Note This test may not elicit a true reading of maximum gain for hear ing aids with an onset of non linear operation below
4. Figure 2 1 4 Local menu Some local menu selections are common across screens When this is the case selections made in one local menu will usually carry across any other local menu containing that selection For instance AID TYPE is a common selection in the local menus of the Coupler and Insertion Gain screens If you were to set the AID TYPE to AGC in the local menu of the Coupler screen it will automati cally be set in local menu of the Insertion Gain screen HINT Located between each option and its selection in the local menu is a series of dots or dashes For instance there are a series of dashes between AID TYPE and AGC in the local menu of the Coupler screen Dashes indi cate the selection can be saved as a default setting in the Default Settings screen Dots indicate that the selection cannot be saved as a default selec tion See Section 2 2 for details 28 FONIX 7000 Hearing Aid Analyzer 2 1 5 Using the EXIT and RESET buttons The EXIT and RESET buttons can be used to exit from any screen menu or window The RESET button resets the analyzer and returns it to the start screen By default this start screen is the Opening screen with the Frye logo However the user can change the start screen to be the Coupler Multicurve screen by chang ing the settings in the Default Settings see Section 2 2 1 All measurements are erased and the settings are returned to their default values It is recommended to use
5. Real Ear Measurements 141 FONIX TYPE 7000 ANALYZER Audi ogram lt Right gt TL UCL dBHL 101 02 02 OL 05 105 o5 70 115 u 0 u Pred Frye Pred REC dE 1ikHz 2 Right 1tkHz32 4 8 x 1 ikHz 2 Use UPTOWN to select frequency Use LEFT RIGHT to enter the dB Press MENU for local menu FL Fe Fa F4 Fa User 1 Left RECI Predict UCL Curve Adult 2003 08 12 Select Ear Select Crv Actions Select Age 17 30 41 Figure 6 3 5E Taking an RECD Measurement 6 3 6 Modifying a Target Once you input an audiogram in the Audiogram Entry screen a target will auto matically appear on the real ear measurement screens You can use the Real Ear Target screen to modify a target or to input your own target in dB insertion gain or dB SPL edit your clients HTL and UCL values in dB SPL and input a cus tom real ear to dial difference REDD 1 Enter the Real Ear Navigation screen by pressing F2 from the Opening screen or EXIT from a real ear screen such as the Audiogram Entry screen Press F2 to enter the Real Ear Target screen See Figure 6 3 6 If you have input an audiogram as described in Section 6 3 1 you should see targets in both the SPL and gain graphs Select the desired ear with F1 Use F3 to select the desired fitting rule Use F2 to select the data you want to edit The choices are e HTL re The client s audiogram
6. Select signal type with F5 Press F5 Use v a to select the desired sig nal type Press gt to complete the selection and close the pop up menu See Section 3 4 1 for details on signal types Press START to initiate the frequency sweep If you are using the LONG NORMAL or SHORT selections the test will stop when the sweep is com plete The COMPOSITE DIG SPEECH and FAST signals are continuous making it necessary to press STOP when you want the signal to stop 5 Use F2 to select the next curve to be measured 6 Repeat steps 3 5 to take additional measurements Figure 3 4 2 shows a completed normal pure tone sweep 70 FONIX 7000 Hearing Aid Analyzer FONIX TYPE 7000 ANALYZER Coupler Left Ear Curve Characteristics Cury lt Source gt RMS Cor NR Name Type Trans Amp Out Chamb Chamb Chamb Chamb Chamb Chamb Chamb Chamb Chamb CL CFP Chamb OFF Chamber Leveled Noise Reduction OFf Max 102 9 dB SFL Avg 98 5 dB SPL 1 kHz 2 Source Measurement Anpl Freq Ampl Dist dBSPL Hz dBSPL 65 1000 Use UP DOWN to select test level Use MI750E and HA coupler Press START to run test at selected curve Press MENU for local menu Source Puretone 1 12 Octave FL Fe Left Ear 1 Delete Off Prev F2 F4 F7 Select Cru Select OnOff Curvets Src Select Auto Test Toggle 2003 05 29 12 53 57 Figure 3 4 2 Pure tone measu
7. To delete the displayed results press F6 and use v a to select DELETE ALL CRVS Press gt to perform the deletion 5 1 7 Testing Digital Hearing Aids The ANSI S3 22 labeling standard for hearing aids was not designed with digi tal hearing aids in mind In fact most of the testing methods employed by ANSI have been around since the 1970s However since ANSI is a standard in order to conform to that standard it must use only the testing techniques outlined in the standard For this reason the 7000 test system has no provisions for incor porating composite or digital speech into the ANSI test sequences In order to test digital hearing aids with noise reduction or speech enhance ment features to the ANSI standards put the aid in test mode via its pro gramming software and do the steps outlined in Section 5 1 4 Contact your manufacturer to get further suggestions on performing an ANSI 96 specification test In order to get an accurate picture of the aid s actual performance when it goes home with your client put the aid in the mode you will use for that client and perform response curve measurements in the coupler and in the real ear via the procedures described in Chapter 3 and Chapter 6 using the digital speech DIG SPEECH signal source 5 1 8 Viewing ANSI measurements in the Coupler screen It s possible to copy ANSI response curves to the Coupler screen where they can be compared to other
8. Pure tone signals are usually flat weighted That is in a pure tone sweep each tone usually has the same amplitude as every other tone in the sweep In con trast the wideband Composite and Digital Speech signals are usually speech weighted That is the lower frequencies of the wideband signals have higher amplitudes than the higher frequencies simulating the long term average of speech When viewing measurements in output dB SPL the weighting of the signal is very important because the signal input is included with the measurement results of the output This could cause some problems when comparing pure General Operation 37 tone sweeps with speech weighted Composite or Digital Speech signals For this reason we have made it possible to weight the real ear pure tone sweeps on the 7000 hearing aid test system The TONE FILTER selection is available in the Setup Menu under Real ear set tings and in the local menus of the Real Ear Insertion Gain and Real Ear SPL measurements screens It has the following settings e FLAT Uses a flat weighted signal with equal amplitudes of all the tones in the sweep e ANSI Uses the ANSI weighting in the pure tone sweep e ICRA Uses the ICRA weighting in the pure tone sweep e AUTO Uses the ANSI weighting for measurements below 85 dB SPL and the FLAT weighting for measurements at 85 dB SPL and above Pure tone measurements made in the coupler measurement screens are always flat wei
9. The probe tube is inserted into the ear canal Section 6 2 3 The sound field speaker is leveled Section 6 2 4 The unaided response is measured Section 6 4 3 The hearing aid is carefully inserted into the ear The aided response is measured Section 6 4 4 CP Ns ee ees BS The insertion gain response is compared to the prescribed insertion gain tar get and any necessary adjustments are made to the hearing aid in order for the response to better match the target The Insertion Gain screen itself consists of two graphs See Figure 6 4 1 The bottom graph displays an unaided response and up to four aided responses in dB Gain or dB SPL The top graph displays a prescribed insertion gain target and up to four insertion gain curves Insertion gain is the difference between the patient s aided and the unaided responses 144 FONIX 7000 Hearing Aid Analyzer In other words the bottom graph of the insertion gain screen shows the differ ence between the sound field measured by the reference microphone outside of the ear and the probe microphone in the ear canal When the reference micro phone is disabled the estimated sound field is subtracted The top graph shows the insertion gain which are the values obtained when the unaided response is subtracted from the aided response Target Curve A displayed in the top graph in the Real ear Insertion Gain screen is automatically adjusted to the source type and amplitude of t
10. UCL 136 141 Unaided response 146 User mode 30 V VA CORFIG 3 115 Visible Speech 163 W Warranty 22
11. 6 3 4 Entering Bone Data The NAL NL1 target uses bone data in its calculations If the patient s bone thresholds are not entered it will assume average values No other fitting rules use the bone data To enter this data Press MENU in the Audiogram Entry screen to open the local menu Set the FITTING RULE to NAL NL1 using the arrow keys Press EXIT to exit the local menu Press F2 repeatedly until BONE is selected ao FW N e Use the arrow keys to enter the bone values into the appropriate column of data 6 3 5 Performing an RECD measurement The real ear to coupler difference RECD is the acoustical difference between a 2 cc coupler and the real ear occluded response of an individual It involves a coupler measurement and a real ear measurement Both measurements are usu ally performed with an insert earphone as the transducer It s also possible to use a linear hearing aid instead of an insert earphone to perform the RECD test In this case you would use the same hearing aid set with identical volume control and or other settings for both the coupler and real ear portions of the test The DSL Method does NOT recommend using a hearing aid as the RECD transducer Coupler Measurement The coupler part of the RECD is performed when you calibrate the insert earphone used in the measurement When this calibration is performed the coupler measurement is stored into permanent memory This saves a lot of time beca
12. To enter the Attack amp Release screen press F5 Other Tests from the Opening screen Then press F3 Attack amp Release Press START to run the Attack amp Release test Measurement results are displayed in graphical and numeric format See Figure 4 4 The top graph contains the response of the aid over time to the Attack test The bottom graph shows the response of the aid over time to the Release test These graphical displays let you see how the device performs over the attack and release phases Erratic performance during these critical phases could result in effects that are audible to a hearing impaired listener These effects could be annoying or even could obscure parts of a conversation The actual attack and release times determined by the analyzer are shown in a box to the right of the graph Automated Test Sequences 105 POR TL 00 ARATE Fiteck amp Haimre Bir Tye Yl Ap i da Ei LEELEE oe LEFMRADHT be waliot frequency Pread START te mun beat PEM for Distal pee aed EMT ta lert Fl Fe Fa Fa FS Fe Fi Fe SETIF Left Es AEL 36 Preti a hi D oat Pe i Salm Setini Se Tye ie Seale f Rel Seale Figure 4 4 Attack amp Release Test Attack graph Release graph Measured Attack amp Release times and test settings Bw N e Currrent Attack amp Release settings By default the Attack amp Release test uses the settings specified by the ANSI 96 test sequence at 2000 Hz If yo
13. a The equipment complies with IEC 60601 1 b The equipment complies with relevant IEC and ISO safety standards and is supplied from a medical grade isolation transformer c The equipment complies with relevant IEC and ISO safety standards and is kept at least 1 5 meters from the patient The allowable leakage currents of IEC 60601 1 1 must not be exceeded IEC 60601 1 1 should be consulted when assembling such a system Electromagnetic compatibility The 7000 complies with IEC 60601 1 2 The 7000 generates and uses radio frequency energy In some cases the 7000 could cause interference to radio or television reception You can determine if the 7000 is the source of such interference by turning the unit off and on If you are experiencing interference caused by the 7000 you may be able to cor rect it by one or more of the following measures 1 Relocate or reorient the receiving antenna 2 Increase the distance between the 7000 and the receiver 3 Connect the 7000 to a different outlet than the receiver In some cases radio transmitting devices such as cellular telephones may cause interference to the 7000 In this case try increasing the distance between the transmitter and the 7000 Disposal of the 7000 and accessories The 7000 and some of its accessories contain lead At the end of its useful life please recycle or dispose of the 7000 according to local regulations If you are located in the European Union please repo
14. e LEVELED Leveling has been achieved within 0 25 dB between 260 6000 Hz and 0 5 outside that frequency range for sound chamber level ing or within 1 dB between 260 6000 Hz and 2 dB outside that fre quency range for real ear leveling e SEMI LEVELED Leveling has been achieved between 0 25 dB and 0 5 dB between 260 6000 Hz and between 0 5 and 1 5 dB outside that frequency range for sound chamber leveling or between 1 dB and 2 dB between 260 6000 Hz and between 2 dB and 6 dB outside that frequency range for real ear leveling 54 FONIX 7000 Hearing Aid Analyzer e WEAK LEVELED Tolerances are the same as SEMI LEVELED but the max imum output for the speaker is less than 100 dB for coupler measurements or 80 dB for real ear measurements To achieve a louder signal the speaker needs to be moved closer to the analyzer microphone and re leveled If a leveling error occurs during sound chamber leveling check the connections of the sound chamber and the microphone and make sure that you are getting noise out of your sound chamber If those connections are good your microphone is probably in need of calibration or it is damaged It is also possible that your sound chamber speaker is damaged but this is a much less common problem If you are having problems leveling the sound field speaker for real ear measure ments check the connections of the microphones remote module and sound field speaker If you have been a
15. 2 SPKR 3 EARPHONE 4 SOUND CHAMBER 5 RS232 6 RS232 LEDs 7 MONITOR 8 GAIN 9 MICROPHONE 10 SCOPE 00000000000000000000 EA O TH uhei tal TTA 9 eae Fonix 7000 Serial No 1234 nN 0 CD FONIX 7000 i 5 RE 3 7 100 etectronicsmopue E A sek TEREA Maaa i Nigol orgon LSA Caa al 3 7 O A WO 2 j iS Connects an external printer to the 7000 test system Connects the sound field speaker for real ear measure ments Connect a insert earphone to the analyzer for RECD mea surements A 50 ohm earphone should always be used to avoid harm to the earphone Connects the main module to the sound chamber Connects the 7000 test system to a personal computer The red LED indicates the analyzer is sending a poll This will flash whether or not a computer is connected The green LED indicates the analyzer is receiving a command from a connected computer Connects the main module to a video monitor Adjusts the calibration of the M1950E microphone Connects the M1950E microphone Connects to an external scope for external measuring pur poses 14 FONIX 7000 Hearing Aid Analyzer 11 PROBE Connects the main module to the remote module used for real ear measurements KEYBD Not currently active AUX Not currently active The following safety symbols can be found on the back of the 7000 hearing aid analyzer K Type B Equipment The probe mic
16. SAFETY 044 1007 00 Per requirements of ANSI S3 22 1996 for adapting ear level aids to the HA 2 coupler 119 0204 07 13 059 2005 02 675 76 059 2004 02 312 059 2006 02 10A 230 059 2010 01 All with 12 cables 24 cables available on request 026 0006 00 010 0019 00 058 0077 00 VGA flat panel 15 color Shipping weight 21 lbs 10 kg 044 1004 03 NBS 9A for checking audiometer headphones 030 1002 04 Tubular steel stand which brings the testing area or the test chamber to convenient table height Blue color 030 0004 00 For calibration of microphone amplifier 1 kHz 114 dB SPL 043 1053 00 For checking response of aids in telephone mode ANSI S3 22 1996 120 1002 00 For checking hearing aid response to a magnetic loop field AA 059 1011 00 41 059 2009 02 5 059 2008 01 All with 12 cables 24 cables available on request 010 0020 00 On request at time of purchase Electronics module conforms to IEC 60601 1 GUARANTEE The FONIX 7000 and its accessories are guaranteed to be free from manufacturing defects which would prevent the products from meeting these specifications for a period of one year from date of purchase Appendix B 177 Calibration B 1 Calibrating the microphones To calibrate the 7000 Test System s microphones you will need a sound level calibrator such as the Quest CA 12 the 14mm to 1 inch microphone adapter provided with
17. Speech only 5 Selected noise reduction 6 Source Signal Statistics Box Displays the source amplitude 3 2 The Leveling Process Leveling is the process by which the response of the sound chamber is mea sured and computer corrected so that a flat sound field is achieved The level ing status can be saved into the 7000 test system s permanent memory so that you don t have to level the analyzer every time you turn it on However if you get your analyzer calibrated or if you get a software upgrade you should always level the chamber again and save the leveling To double check the leveling status of the analyzer place the microphone in the sound chamber at the reference point by itself and run a composite frequency response see Section 3 4 2 You should get a smooth flat curve If you are getting bad coupler frequency responses that you suspect are the fault of the analyzer rather than the fault of the hearing aid the first step of trouble shooting is to level the sound chamber Even if the screen says LEVELED the response of the measurement microphone may have altered since the analyzer was last leveled invalidating the leveling When in doubt level the sound chamber again See Section 2 8 for details on the leveling status and troubleshooting the level ing process 3 2 1 Leveling the sound chamber To level the sound chamber 1 IMPORTANT Be sure nothing is plugged into the battery voltage supply 2 Pl
18. drain FONE THRE Fit FAL YZER fourier Lett Cor Durer Co ce ide rd wh i ar EME Cor AA Pottery Curren Tae 15 Zir ires 2 et Lie LPO eo eee tet laual Lie ATS ed H coe Preia START to pun basi ok felected gute Freri MEM for E Ti HiP Toggle Figure 3 4 9 Battery Current Drain 78 FONIX 7000 Hearing Aid Analyzer 3 4 10 Telecoil Telecoil measurements can be performed in the Coupler screen using any of the source signals available on the 7000 Hearing Aid Test System During a telecoil measurement a magnetic field is used that is supposed to simulate the field of a telephone receiver A telecoil board capable of producing this field is built into every 7000 sound chamber When the analyzer has the ANSI option the external Telewand can also be used for the measurement Analyzer Setup It is very important to pick a testing location that is free of magnetic disturbanc es especially those caused by fluorescent lights and power lines To do this 1 Locate a wide range linear hearing aid with good low frequency response and a telecoil switch 2 Set the hearing aid to operate in the telecoil position and turn the gain con trol up to its full on position 3 Connect the hearing aid to a coupler Don t insert the measurement micro phone 4 Walk around your possible testing location and listen for raspy humming sounds from the hearing aid This will be the aid responding to magnetic fields i
19. from the Opening screen to enter the Real ear Navigation screen Then press F4 FORDE Tere PS ie TER Mead fer SL Gra Charice jie ca Cure t Sourte 3 RAE Probe AR Fie fiti hps Gree cl Ge P mir FUR GE i E FLZ REAR EP EF i M E ae ii E Ea ea E PEAR TP E Pe ie o FAR Po a HTL E LIHT He AT HE HIGT UT UEL Sources Ci aepescin AEL bbe ight Sound Field Liven bed Fis Tore OFF Prejpecied Hiis Reduction af Beieren Hipi On moot Log iradded Cuiton Cetout Limiti 140 oP Target Fortul WALL n x jLeFt iara DE ta red the F 4 1 Ue UPHAM ta balasi teat beel Fresa START ta run bart STW 1 eee ot ji ER Figure 6 4 2 Rear ear SPL screen The T curve represnts the patient s thresholds the L M and H curves represent the NAL NL1 targets Curve 1 shows the unaided response Curves 2 3 and 4 show the aided response at 50 65 and 80 dB SPL The patient s UCLs are just off the top of the graph 6 4 3 Measuring the Unaided Response REUG REUR The REUG REUR is a measurement of the unaided response of the patient s ear canal It can be measured in either the Real ear Insertion Gain screen or the Real ear SPL screen and any measurement performed in one of these screens will be automatically displayed in the other screen To measure the unaided response 1 Position the patient in front of the sound field speaker and place the earhook and reference microphone on the ear
20. resting against the lower edge of the tragus If neces sary reposition the body of the probe microphone lower on the Velcro button of the ear hanger If desired use surgical tape to hold the tube in position FONIX TYPE 7000 ANALYZER Real Ear Insertion Gain Curve Characteristics Curve lt Source gt PHS NR Name Titl Type Trans dB Out JEE PEUG CG S REAG PNP S REAG PNP S 5 S F 55 64 4 48 REAG PNP REAG PSP REIG REIG REIG Aided PL9 REIG Unaided fa TARG F F Fy F Source Composite ANSI Weighted Sound Field Leveled Projected Noise Reduction 4 Reference Mic On Smoothing Log Dut Limit 120 dESI an Target Formulat Mi Left Ear Source 55 dBSPL gt a 25 5 i tkHz 2 4 8 Use UP DOWN to select test level Use Probe and Reference microphones Press START to run test at selected curve Press MENU for local menu FL F2 FS F4 FS FE Fa User 1 Left Ear REUR 1 Curve Curve Composite 2003 08 12 Select Crv Select On OFF Actions Sre Select 1505431 Figure 6 2 3B Unaided response with correct insertion of the probe tube 6 2 4 Leveling the Sound Field Speaker The first step in making real ear measurements is to level the sound field speak er The sound field includes the room and everything in it the operator the cli ent and any ambient noise that may penetrate the room Leveling is important so that the input to the hearing aid is p
21. tions modified to take the smaller CIC volume into account The Basic Problem The ear is not a simple structure It is a biological coupling device that converts sound energy to nerve impulses It also has a pinna that helps to direct higher frequency sounds into the external canal The part of the structure we are con cerned with is the external ear canal or cavity which is terminated by the TM The ear canal can be considered to be fairly rigid when it is compared to the TM In the lower frequencies below 2000 to 3000 Hz the frequency related changes in impedance that we see in an ear can be thought to be mostly caused by the TM When we reduce the volume of the cavity between the hearing aid and the TM by moving the aid closer to it we should expect to see the TM play a more important part in determining the response of the aid For more shallow standard earmolds the volume of the central cavity of the ear reduces the effect of the TM s frequency impedance changes This is because the volume of the cavity is added to the equivalent volume of the TM If the cavity volume is large and does not change with frequency then the large changes in impedance of the TM are swamped by the large volume of the ear canal If on the other hand the TM is working into a very small volume then it would affect a large change in impedance across the frequency range CIC Hearing Aid Gain and Frequency Response Changes From the above discussion we see
22. to set the source amplitude to 50 dB SPL 4 Press START When the measurement has stabilized press STOP The measured curve is the reverse measurement of the directional test If the directional microphones of the hearing aid are working properly this curve should have less output or gain than the forward measurement The difference in the RMS Out of the two curves will give you the average over all advantage provided by the directional microphones See Figure 3 4 11D In this example the hearing aid has an 8 dB average directional advantage Basic Sound Chamber Tests 83 Curve Character delice Cary er5u geen PH Car WR i baron lipiprh MOL ipie Chamber Lela Disa Tone OFF Projected Haise Heduckion d LEX Battery Corre 0 R Sim Uap 2 4 Lo kH 2 4 G ara MEA aree 5 aR ps IMEN to lest tast level loe LeftBight to psle t biss tore on START bo rur tast HHO for local mma ond EEIT bo lera A F Fi ra TE F wW Lait Lar i tarva felate Dugtpsech Wire Figure 3 4 11D Directional measurement screenshot 84 FONIX 7000 Hearing Aid Analyzer 3 5 Digital hearing aids All digital aids can be tested but some of the high end models require a little more thought and care these aids have a noise suppression feature also known as speech enhancement This noise suppression not to be confused with the automatic compression of AGC hearing aids checks if the
23. 2 2 2 AM PM 24 Clock setting Choose between using AM and PM settings or the 24 hour clock Coupler RESET SOURCE The signal type selected in the Coupler screen when the RESET button is pushed NOISE RED TONE Amount of pure tone noise reduction used in coupler mea surements See Section 2 3 1 2 NOISE RED COMP Amount of composite noise reduction used in coupler measurements See Section 2 3 2 1 CURVE LABEL Label used for the two available ears Choose between LEFT RIGHT and A B BATTERY SIZE Size of battery used with the hearing aid being tested Used in battery current measurements COUPLER TYPE The type of coupler being used in making sound chamber measurements Selections of CIC and MZ turn on corresponding software cor rection factors see Sections 3 6 and 3 7 A selection of NONE or 2cc does not apply correction factors to the curve DISPLAY Display of the Coupler Multicurve screen Choose between Gain and SPL Real Ear Only available with the Real Ear Option RESET SOURCE The signal type selected in the real ear measurement screens when the RESET button is pushed RESET EAR The ear selected in the real ear measurement screens when the RESET button is pushed FIT RULE The selected real ear fitting rule also known as a real ear target REF MIC Status of the reference microphone during real ear measurements OUTPUT LIMIT The maximum dB SPL value that the analyzer will allow when taki
24. 3 3 1A Figure 3 3 1B Standard 2 cc Coupler HA 2 Direct access coupler HA 1 0 4 10 mm NUB CONNECTS TO TOP OF HA 2 COUPLER Figure 3 3 1C Ear level Adapter used with HA 2 The length and thickness of the tubing of the ear level adapter can have a sig nificant effect on the frequency response of an aid If an aid is being compared against the manufacturer s specifications the tubing should be carefully chosen 60 FONIX 7000 Hearing Aid Analyzer to duplicate that used by the manufacturer to obtain the original data For ANSI tests use 13 thick walled tubing with a length of 0 4 inches 10 mm When cutting tubing to length leave extra space at each end to go around the nubs of the ear level adapter and the hearing aid hook Both the HA 1 and the HA 2 couplers have an O ring located deep within them that reduces pressure on the inserted microphone thereby reducing damage to the microphone When inserting the microphone into the coupler you will feel a point of resistance when the microphone reaches the O ring You must contin ue to push the microphone into the coupler past that first resistance or incorrect data will be collected 3 3 2 In The Ear ITE and Canal Aids 1 Roll the Fun Tak provided with each instrument into a rod long enough to go around the transmitting end of the aid approximately 2 inches Modeling clay can also be used but it doesn t work as well 2 Bend the Fun Tak rod aro
25. 60dB Target Reference Gain This information is only displayed when the actual gain is greater than the calculated desired setting of gain This target is used to adjust the hearing aid s actual gain to a level of 1 dB of the target The figure is calculated by adding the 60dB SPL input 17dB and subtracting it from the NSPL90 RMS output NSPL90 D 77 desired setting of gain Actual Reference Gain The measured amount of gain when the hearing aid is set to the reference test position Noise I O Curve This demonstrates the compression or limiting of the non linear circuit For a more detailed explanation of these terms consult the ANSI S3 42 1992 standard Automated Test Sequences 119 kHz 2 5 1 Frequency Response Curves 5 50dE Br60dE 7 70dE 8r80db 9 90dE Test completed Press START to run test again 4 FOMIX TYPE 7000 ANALYZER ANSI 53 42 1992 Left Ear NSPLIQ 109 8 deS IA Full On Noise Gain 37 8 dB Target Ref Gain 32 8 dB Actual Ref Ga n 33 5 dB Test Specifications Meas Bandwidth 200 8000 Hz Settle Time 1000mS Noise Type Pseudo Random Measure Avg 16x Analysis Windou Rectangular Filter Smooth None Filter Bandwidth 100 Hz Crest Factor 12dB Analysis Method Single Channel FFT 70 B0 9 BIN 1 0 Curve LEVELED F4 Clear Test Tata F2 Fa 1000mS 16x Settle Time Moise Reduc F1 Left Ear F Curve Act ons 2003 06 02 11 47 13 i Figure 5 2
26. All Curves Delete all curves but keep the curve selections All Curves amp Settings Delete all curves and return them all to analyzer default settings 2 Use v a to make the desired deletion type 3 Press gt to perform the deletion and close the pop up menu Basic Sound Chamber Tests 73 3 4 5 Running a Single Frequency Measurement At times you may want to find out what the frequency response of the hearing aid is to a single pure tone signal See Figure 3 4 5 Pw N e Press MENU from the Coupler screen Use v a to select Static Tone under Source Settings Use lt gt to choose SINGLE Press EXIT to return to the Coupler screen The single tone will automati cally be running Adjust the frequency using the lt gt buttons Adjust the amplitude using the a v buttons PIRIT TIFE Fic nH LYZER map Lae Dar Durer h Gource EME Cor AA a om i ie im i oF oF i oF i uF L 7 Seca Single Tors Lemlaj Noite Feda igon W Has 28 5 L Lie LPI o talast bapt beuel Uis ATS a H aple Preis START to run bani p felected direi Preii HERU for bosil eii FI FS Ta n E a Lefe Ear Curve 1 Memes iy Pree mlet OrvtHt Curvelel oro Select Ago lert Toggle Figure 3 4 5 Measuring a single frequency 3 4 6 Running a Three Frequency Average The ANSI standard includes some three frequency average tests You can run a three frequency average test apart from
27. Composite signal is the standard signal used on the 6500 CX test system the predecessor to the 7000 The Chirp Composite signal is another type of composite signal with a low crest factor The phase of the individual frequency components of the Chirp Composite signal is determined in a way that makes the signal appear to be pre sented as a chirp or very fast sweep The Chirp has a crest factor of 6 dB The General Operation 41 Chirp Composite signal is the standard composite signal used on the FP40 and FP35 portable hearing aid test systems Although the Standard and Chirp Composite signals sound the same to most people an analysis tool such as Tempus3D will show the difference between them Both the Standard and the Chirp Composite signals are further speech weighted to agree with the user selected composite filter described in Section 2 3 2 3 2 3 2 5 Composite source levels The Composite signal and its Digital Speech counterpart is a complex signal consisting of 79 different frequency components When you set the source level of a composite signal 50 dB 60 dB etc you are actually setting its overall energy known as the RMS root mean square of the signal you are NOT set ting the amplitude of the individual frequency components The actual amplitude of each of frequency of the Composite signal is less than the overall RMS of the signal See Figure 2 3 2 5 for an example of the ampli tudes of each frequency of
28. EXIT instead of RESET when moving between screens to avoid the loss of data The EXIT button closes a popup or local menu When all such menus are closed the EXIT button exits the current screen without altering the settings measurements and test conditions of the analyzer 2 1 6 Using the remaining buttons Here is a description of the remaining buttons on the front panel of the analyzer and their use LEVEL Levels the sound chamber or sound field speaker See Sections 3 2 and 6 2 4 for details FEED Advances the internal thermal printer paper PRINT Prints the current screen See Section 2 4 for details STOP Stops a currently running test START Starts a test ARROW KEYS The arrow keys perform different functions depending upon the screen and previous buttons pushed In a test situation they adjust the source amplitude and frequency If you press one of the function buttons to bring up a pop up menu they are used to scroll through the available options and make selections In the Audiogram Entry and Target Edit screens they are used to edit the audiogram and targets 2 2 Setup Menu The Setup menu contains a number of different functions that set up your ana lyzer for testing These functions include saving and loading default settings setting the date and time setting the comfort level of the user and calibration functions This section contains instructions for several of these functions For cal
29. F5 Adult RIGHT to enter the dB Select Age 1 tkHz 2 User 1 2003 08 12 17 30 41 Figure 6 3 6 The Real Ear Target screen Real Ear Measurements 143 6 3 7 Entering an REDD transform The REDD transform affects how dB HL values are converted to dB SPL To enter a measured REDD value 1 Enter the Real Ear Navigation screen by pressing F2 from the Opening screen or EXIT from a real ear screen such as the Audiogram Entry screen Press F2 to enter the Real Ear Target screen Press MENU in the Real Ear Target screen Select REDD using v a Choose CUSTOM using lt gt Press EXIT to return to the Real Ear Target screen Use F1 to select the desired ear Use F2 to select REDD You may have to press F2 repeatedly The REDD column for the selected ear will now be highlighted a ee gee ee ee Ae 9 Use the arrow keys to input the REDD transform The v a keys select the frequency The lt gt keys select the amplitude 6 4 Real Ear Measurements The 7000 Hearing Aid Test System has three real ear measurement test screens Insertion Gain Real ear SPL and Visible Speech The Insertion Gain and Real ear SPL screens are explained in this section See Section 6 7 for operation of the Visible Speech screen 6 4 1 Measuring in the Insertion Gain screen Insertion Gain is the most conventional method used for performing real ear measurements In the typical insertion gain procedure
30. Figure 3 4 11A It is important to keep this in mind when positioning the directional hearing aid for measurements Figure 3 4 11A 7000 sound chamber speaker placement Forward measurement The first step in doing a directional test is to position the hearing aid in the sound chamber so that the front of the hearing aid is pointing towards the right side of the chamber See Figure 3 4 11B Close the sound chamber lid and per form the following steps 1 Enter the Coupler Multicurve screen by pressing F1 from the Opening screen 2 Use F5 to set the source type to Digital Speech Use v a to set the source amplitude to 50 dB SPL 4 Press START After the measurement has stabilized press STOP The measured curve is the forward measurement of the directional test 82 FONIX 7000 Hearing Aid Analyzer Figure 3 4 11B Forward directional measurement Reverse measurement Next open the sound chamber and position the hearing aid so that the front of the hearing aid is pointing towards the left side of the chamber See Figure 3 4 11C Different hearing aids have different null points so you will want to adjust the positioning so that the sound chamber speaker is pointing towards what should be the null point of the directional aid Close the sound chamber lid when finished and perform the following steps 1 Use F2 to select the next curve 2 Use F5 to set the source type to Digital Speech 3 Use v a
31. I O test at the selected frequency Turn the test ON or OFF I O Start The delay after the first tone is presented in the I O sweep and before the first measurement is taken I O Meas The delay between frequencies in the I O sweep Attack Window The amount of time the analyzer measures the attack time of the hearing aid Select a time that is at least twice as long as the attack time specified by the manufacturer Release Window The amount of time the analyzer measures the release time of the hearing aid Select a time that is at least twice as long as the release time specified by the manufacturer Note ANSI 87 only measured I O at 2000 Hz and the Attack and Release win dow settings are not available Misc Settings e Print Label Status of the printing label Choose ON or OFF e Printer Printer used for printouts Choose INTERNAL or EXTERNAL See Section 2 4 Automated Test Sequences 117 5 2 ANSI S3 42 1992 ANSI 92 The ANSI Option includes a test sequence based on the ANSI S3 42 1992 stan dard This standard has been developed to test non linear hearing aids with a broadband noise signal The need for this standard stems from the importance of evaluating the performance of these circuits in a more real world environ ment ANSI 92 gives you noise saturation sound pressure level noise gain a family of frequency responses and a noise input output curve 5 2 1 Understanding ANSI 92 The original signal used
32. Loading amp Saving Groups You can use the 7000 Test System to program simple automated or semi auto mated test sequences that will help you test hearing aids more efficiently Each test sequence can contain up to 10 different response curves with your choice of source types source levels noise reduction and other adjustments In automatic mode the analyzer will quickly run through all designated tests without pausing In semi automatic mode the analyzer will automatically advance to the next curve and stop This curve will not be measured until you start the test but you are saved the step of using F2 to select the next curve number Tests are programmed into the analyzer using the PROGRAM function that is used to put the analyzer in Program mode In this mode you set up the source type source level noise reduction and any other adjustments you would like to make for each curve You can program any of the available 10 curve slots in the Coupler screen See Section 3 8 1 for more details 92 FONIX 7000 Hearing Aid Analyzer If there is a sequence of tests that you would like to perform frequently you can save it into the 7000 Test System s permanent memory using the SAVE GROUP function Three groups of up to 10 curves can be saved into SAVE GROUP 1 2 and 3 respectively When you want to load a group that has previously been saved you use the LOAD GROUP function See Section 3 8 2 3 8 1 Setting up a test sequence The
33. See Sections 6 2 1 and 6 2 2 2 Insert the probe tube into the patient s ear canal See Section 6 2 3 3 Input the patient s audiogram to generate a target if desired See Section 6 3 4 Press EXIT in the Audiogram Entry screen to return to the Real ear Navigation screen Real Ear Measurements 147 5 Enter the Insertion Gain or Real ear SPL screen by using F3 or F4 in the Real ear Navigation screen respectively 6 Level the sound field speaker See Section 6 2 4 7 Select the desired ear with F1 8 Look at the F2 setting to see which curve is selected If necessary use F2 to select REUR 1 Press F2 Use v a to select REUR 1 Press gt to com plete the selection and close the pop up menu 9 Use F5 to select Composite 10 Use v a to select the desired amplitude for the measurement We recom mend 65 dB SPL 11 Press START to start the measurement 12 Press STOP when the unaided response has stabilized Curve 1 in the bot tom graph of Figure 6 4 1 shows an example of the unaided response using the Gain display in the Insertion Gain screen To choose between Gain and SPL Output In the Real ear Insertion Gain screen the bottom graph contains the unaided and aided measurement curves as a function of gain REUG REAG or of output SPL REUR REAR The SPL display includes includes the input signal in the measurement The gain display subtracts the input signal in th
34. Sequences 99 It then continues through a complete cycle and terminates when it reaches the baseline again This signal although consisting of only a single pulse contains very few frequencies above 1 kHz and is one millisecond wide at its base The data collected from this measurement is displayed in a graphical format 20 milliseconds wide The system delay and the digital processing delay are noted for reference on the phase graph in the form of vertical lines 4 1 3 Procedure 1 Press F8 in the Opening screen to enter the Enhanced DSP screen 2 Set up the hearing aid for testing in the sound chamber See Section 3 3 Make sure the sound chamber is leveled 3 Use F1 to select the desired ear POM TYPE Fond Pe TE Erhai BSP Lert Ger ase F roa p Graph i Bevice Dele Sf eS i 1 Sele ba uilh PL Ges EP ree al H ple Petit START to Aun beat Figure 4 1 3 Enhanced DSP measurement results 4 Press START to perform the delay and phase tests for that hearing aid If the left ear was designated in Step 4 the results will be shown in the upper two graphs Otherwise they will be shown in the lower two graphs 5 Set up a second hearing aid in the sound chamber if desired and use F1 to select the other ear Press START to perform the measurements on this second aid This will allow you to compare the results of the two hearing aids See Figure 4 1 3 100 FONIX 7000 Hearing Aid Analyzer When
35. Standard Technical note Most of the IEC measurements are made with the aid set to reference test gain You can either set the aid to the reference test gain calculated by the 7000 ana lyzer or you can set it to the reference test gain specified by the manufacturer in IEC 118 7 We calculate the reference test gain by the following method The reference frequency is measured at 90 dB SPL value A and 60 dB SPL value B e If B gt A 68 the calculated reference test gain is A 75 e Otherwise the calculated reference test gain is B 7 5 3 1 Setting up for IEC 1 Set the controls on the aid to give the maximum output and gain For AGC aids this is usually accomplished by setting for the minimum compression 2 Set the aid for the widest frequency response range 3 Insert the appropriate battery simulator pill but do not yet plug it into the battery voltage supply 4 Attach the aid to the appropriate coupler See Section 5 2 for details When testing a BTE aid use the BTE adapter and a 0 6 15 mm length of 13 thick walled tubing The combined length of the BTE adapter and the tub ing is the right length to meet the specification once you have inserted the ear hook into the tubing Automated Test Sequences 121 5 6 Level the sound chamber if necessary see Section 5 1 1 Plug the battery simulator into the jack near the battery voltage supply 5 3 2 Running IEC 1 Press START from
36. Turn it ON or OFE EQUIV NOISE TEST Status of the equivalent input noise measurement Turn it ON or OFE TELECOIL Status of the Telecoil measurement Turn it ON or OFE 2 3 Source Types There are two main types of sources available on the 7000 test system pure tone and composite Four types of pure tone sweeps are available long normal fast and short Two types of composite signals are available Composite and Digital Speech The composite signal can have your choice of speech weight ings including ANSI and ICRA The type of signal you should choose for a particular test or type of hearing aid depends upon the situation Here is a description of each of the source types and when you would want to use them 2 3 1 Understanding Pure tone Signals A pure tone sweep is a test involving a progression of pure tone signals pre sented at a specified level When the sweep is complete the aid s frequency response at those frequencies is displayed on the graph or data column There are four types of pure tone signals long normal fast and short e LONG Contains 64 different frequencies and only does one sweep before ending the test e NORMAL Contains 43 different frequencies and only does one sweep before ending the test e FAST Contains 16 different frequencies and continually sweeps through them until you stop the test The fast sweep is meant to be used as a real time continuous signal convenient for use while adjusting
37. and FLAT Flat is generally only used for specific research purposes it contains no speech weighting and is difficult for most hearing aid circuits to process See Section 2 3 2 3 for a discussion of the ANSI and ICRA speech weightings 38 FONIX 7000 Hearing Aid Analyzer A significant advantage of using a composite signal is that each frequency pres ent in the signal can be individually controlled in amplitude and phase As the analyzer goes through the leveling process each component is adjusted to produce a signal that is optimally accurate at the reference point where the lev eling microphone is located The 7000 test system is able to equalize the ampli tudes to within 0 25 dB for coupler measurements made with the Composite signal The spectrum limits are broadened to within 2 dB for real ear measure ments 2 3 2 1 Noise reduction Composite noise reduction is a little different than pure tone noise reduction discussed in Section 2 3 1 2 even though both are used for noisy testing envi ronments When a composite signal is running the analyzer takes several different mea surements a second and displays them on the screen Composite noise reduc tion performs a running average of these composite measurements This means it averages together several of the previous measurements with the cur rent measurement to produce the next curve If you select 2X noise reduc tion it will average the last two measuremen
38. apply this figure to the response of the 0 25 cc cavity between the hearing aid and the TM When the calculated volume variation of the TM is applied to the smaller vol ume of the CIC coupler the total response variation comes out to be from 8 6 dB at 200 Hz to 5 5 dB at 8000 Hz for a total variation of 14 1dB Summary Using the CIC coupler with its software option gives the dispenser an immediate idea of how much gain that this new type of hearing instrument is going to give the hearing impaired individual It is nice to see that the CIC hearing aid can really produce significant amounts of gain in spite of its apparently poor perfor mance in the 2cc world of the ANSI standard test The user must remember that an actual ear may produce differences from the predicted values Acknowledgment Mead Killion Mahlon Burkhard and Elmer Carlson are to be thanked for help ing assemble the data from which the CIC corrections were derived 188 FONIX 7000 Hearing Aid Analyzer CIC CORRECTION FACTORS Appendix E 189 Fitting Formula Tables The conversions used by the FONIX 7000 Test System to convert audiograms to target gain curves are the following NAL RP FITTING FORMULA CALCULATION The insertion gains at each frequency are calculated according to the following formulas Freq Hz 250 500 750 1000 1500 2000 3000 4000 6000 8000 Insertion Gain dB X X X X X X X X X X 31 HTL 17d
39. are red The long term average speech spectrum LTASS is also displayed as three dotted l m and h curves The LTASS is the average real ear unaided response The m curve is the real ear unaided response at 70 dB SPL The h curve is 12 dB above this curve and the l curve is 18 dB below it The three curves of the LTASS are used as a comparison tool to the aided measurement curves to demonstrate the amplication advantage provided by the hearing aid During a typical real ear measurement using the SPL method 1 The probe tube AND hearing aid are inserted into the ear canal Section 6 2 3 2 The sound field speaker is leveled Section 6 2 4 3 The hearing aid is carefully inserted into the ear 4 The aided response is measured Section 6 4 4 with an input signal of 50 dB SPL and compared to the patient s HTLs 5 The aided response is measured with an input signal of 65 dB SPL and com pared to the real ear target 6 The aided response is measured with an input signal of 90 dB SPL and com pared to the patient s UCLs Most of the operations of the Real ear SPL screen are identical to the opera tions of the Insertion Gain screen Therefore most of the instructions found in 146 FONIX 7000 Hearing Aid Analyzer this section apply to measurements performed in both screens Any differences between operations in the two screens are noted To enter the Real ear SPL screen press F2
40. baat PEMU Fee Decal mirni ded EXD ta biset z F Te Figure 3 4 7 Measuring Harmonic Distortion FONIX 7000 Hearing Aid Analyzer 3 4 8 Intermodulation Distortion The composite signal is helpful for identifying intermodulation distortion IM a type of distortion that sometimes occurs in a hearing aid response IM distortion occurs when more than one frequency is present in the source signal and those frequencies combine to create new frequencies not actually present in the source IM distortion is disturbing to the client often more so than harmonic distortion When viewing a graph run with the composite signal look for points along the graph where the line breaks up Such an appearance indicates the presence of intermodulation distortion As IM distortion increases the curve becomes more disconnected See Figure 3 4 8 for an example of IM distortion This type of distortion is only apparent when the composite signal source is used because pure tone source types do not contain more than one frequency at the same time FONI TYPE 7000 ANALYZER Coupler Left Ear Curve Characteristics Curvy lt Source gt RMS Cor MR Name Type Trane Amp Out TEE CUF Chamb 60 101 1 4x CLe CFP Chamb CLs CFP Chamb CL4 CFP Chamb CLS CFP Chamb CLE CFP Chamb CL CFP Chamb CLE CFP Chamb CLIS CFP Chamb CL CFP Chamb Source Composite ANSI Weighted Chamber Leveled Projected Noise Reduction 4
41. bly or the temple piece from the eyeglass frame if possible Should you be unable to remove the aid assembly or temple from the frame it is possible to place the entire frame in the test chamber for testing Be sure to fold the glasses first Insert the coupler microphone into the HA 2 coupler Couple the aid to the 2 cc coupler using the BTE aid adapter and the appro priate tubing as shown in Figure 3 3 6 The length and thickness of the tubing have a significant effect on the fre quency response of an aid especially in the 500 to 1000 Hz region If an aid is being compared against the manufacturer s specifications the tubing should be carefully chosen to duplicate that used by the manufacturer to obtain the original data For ANSI tests use 0 6 15 mm of 13 thick walled tubing exposed portion Position the microphone of the aid as close as possible to the reference point in the test chamber as shown in Figure 3 3 6 Close the lid if possible and then test as desired If the lid can t be closed measurements can be made with the lid open But we recommend that you first re level the chamber with the lid open and use the quietest possible location FONIX 7000 Hearing Aid Analyzer Figure 3 3 6 Eyeglass Aid Set up 3 3 7 Wireless CROS and BICROS Aids The key to testing these aids is to get the proper amount of separation between the transmitter and the receiver This separation may be vertical The transmit
42. button from the Real Ear Navigation screen You can use the function but tons found on the front panel of the 7000 test system or on the remote module e To exit from any of the real ear measurement screens press the EXIT button on either the front panel of the 7000 analyzer or the remote mod ule This will return you to the Real Ear Navigation screen 6 2 Real Ear Setup This section describes how to set up your client and your analyzer for real ear measurements It is important to follow these instructions carefully since your setup will have a direct impact on the accuracy of your measurements 6 2 1 Placing the Sound Field Speaker For the most accurate repeatable measurements we recommend a sound field speaker placement of approximately 12 inches from the client s head and point ing towards the ear to be tested The speaker should be at an azimuth angle of 45 degrees halfway between the client s nose and ear The height of the loud speaker should be level with or a little above the ear See Figure 6 2 1 NOTE It is especially important for accuracy that the speaker is within 12 if you are using a 90 dB signal Real Ear Measurements 129 Reference Mic Reference Mic Probe Mic N 8 12 L Probe L Speaker Speaker 45 degrees 45 degrees Top View Front View Figure 6 2 1 Sound field speaker setup 6 2 2 Placing the earhook and reference microphone 1 Place the wedge style earhook
43. cord into the three pronged jack on the rear panel of the main module Plug the power cords of both the main module and the video monitor into an AC outlet We recommend using a switchable multiple out let power strip Any voltage between 100 and 240 VAC is acceptable 50 or 60 Hz line frequency FONIX 7000 Hearing Aid Analyzer 7020 Sound Chamber M1950E Microphone Telecoil board optional Earphone Telewand optiona GAN 00000000000000 ATTENTION Ground reliability can be achieved ONLY when equipment is connected to HOSPITAL GRADE receptacles For service refer to qualified personnel only Consult accompanying documents MICROPHONE FONIX 7000 Serial No 1234 FONIX 7000 HEARING AID TEST SYSTEM ELECTRONICS MODULE Made in Tigard Oregon USA ELECTRICAL RATING by Frye Electronics Inc FRYE Frye Electronics products are protected by U S and or foreign patents and or patents pending V 50 60Hz 6A Computer not provided Quik Probe lt o remote module External printer i not provided Monitor Probe Reference mics Headphones Nw Figure 1 6 3 7000 test system setup 1 6 4 Connecting the Real Ear Equipment If you ordered the Real Ear Option connect the real ear equipment as follows See Figure 1 6 3 1 Plug the remote mod
44. earmold is in place Figure 6 2 3A Marking the probe tube Method 2 This method uses the Composite signal and the fact that there is a dip in gain inside the ear caused by a standing wave created by the 6 kHz frequency reflecting off the eardrum 1 2 Press F2 to enter the Real Ear Navigation screen from the Opening screen Press F3 to enter the Insertion Gain screen Real Ear Measurements 131 WARNING Choose OUTPUT LIMITING carefully see procedure below You don t want to damage your clients hearing or to cause them discomfort during testing To ensure safety and comfort the 7000 Test System reacts automatically when the OUTPUT LIMITING level is exceeded at the Probe Microphone When the level measured at the Probe Microphone exceeds the pre set limit the words OUTPUT OVER LIMIT appear on the screen and the signal source is automatically turned off and the measurement stopped The default setting for OUTPUT LIMITING is 120 dB SPL You can set the OUTPUT LIMITING to any level between 90 and 140 dB SPL in 5 dB increments see procedure below In special cases when you select 130 or 140 dB SPL be aware that extra care is necessary with any output that may exceed 132 dB SPL Keep in mind that the sound pressure level at the eardrum can be higher than that measured at the mid ear canal position especially at high frequencies For this reason EXTREME CAUTION is advised when performing real ear S
45. ede es oobi dee Roe ceed eth ie 120 5 3 2 JRUNNING TEC s fae ocatcdaniads tata e e aa ae bbe a a ta cin o aara wale halal O BAN 121 5 3 3 Viewing IEC Results 2 0 4 ccs cence satire EE T N E ee cleo cee 121 5 3 4 Viewing IEC measurements in the Coupler screen 00 cece cece ence ete e ee en eee eneees 122 5 3 5 Understanding the Menu Settings 00 cc cece cece cence eee tence tence tenn eee eees 122 BIS cnn achat wa ncaa r ne Mada oie dials Ivalodaahse nash alata 44 ul oie siclascbhtones a tlordaasti 123 SAAMRUANING JIS se uehe e se aeiheq ade SEG b aes as e eae SUT eels Sees E Ea ake ee ea sen ae 123 54 2 Viewing JIS Results 0 cece cece eee cece teen ee eee eee E EEIE EREE AA E aA 124 54 3 Viewing JIS measurements in the Coupler screen ccc cece eee e ence eee e ee een eee eaeees 125 544 Understanding the menu settings 0 cece cece cee e ene eect n eect ene eee eneeeeneees 125 Chapter 6 Real Ear Measurements 6 1 INtrODUCTION yy c555 4034 ads danger aE ine eeaeenn cana cece Chabad eeeahen legates r arr 127 6 1 1 Understanding the Real Ear Screens cc cece cece ete eee n eect enn e ee eeneeenn eens 127 6 1 2 Navigating through the Real Ear Screens 06 cece ccc e ence e eee n ence eee e eee en estan ser 128 6 2 Real Eac Seti pie sus ccccsccist so i exec cane taacueas ta naees ceases Reise eee A a aaa PEs eee ee 128 6 2 1 Placing the Sound Field Speaker cece cece enc
46. first step in running your custom automated test sequence is deciding on the source types and levels of the frequency response curves When finished these selections can be stored into the analyzer s permanent memory 1 S G Ot STO 10 11 Use F4 to delete ALL CURVES amp SETTINGS in the Coupler screen Press F4 Use v a to select ALL CURVES amp SETTINGS Use gt to complete the selection and close the pop up menu Use F6 to select PROGRAM This will open a pop up window with helpful programming instructions Use F1 to select the ear Use F2 to select the curve number Use F5 to select the desired source type Use v a to select the desired source level Press MENU and use the arrow keys to select the desired noise reduction output transducer and composite type if desired Press EXIT to return to the coupler screen Save and advance to the next curve This can be done two ways e Press START if you want the analyzer to be programmed to automati cally advance to the next curve and start measuring it Press STOP if you want the analyzer to be programmed to advance to the next curve but then pause and wait for user intervention before tak ing the next measurement Use this if you want to make an adjustment to the aid before taking the next measurement A horizontal line will be drawn across the Curve Characteristics box when a pause is inserted in this fashion Repeat steps 5 8 to se
47. handled At the risk of sounding negative the following is a list of the five microphone DON Ts 1 Don t bend the microphone cord at the connection of the cord and the body This is perhaps the most common cause of microphone damage The place where the cord and the body of the microphone meet is the most fragile part of their connection The less strain you put on this area the longer your microphone will last Don t hit the microphone against the sound chamber or any other object The microphone head is delicate and easily damaged Hitting the micro phone against anything will do you no good and the microphone much harm Similarly be careful not the drop the microphone on the floor Don t pull the microphone from the coupler by the cord When removing the microphone from the coupler grip the microphone body not the cord Pulling on the cord damages the connection Don t get Fun Tak on the grill of the microphone Fun tak that accumulates on the grill will fall into the microphone body and onto the diaphragm which will damage the microphone Don t touch the diaphragm of the microphone The diaphragm is located inside the grill of the microphone and is extremely sensitive If you need to take the grill off the microphone please do so with extreme care and be especially careful not to touch the diaphragm as this will cause damage Overall just be aware that your coupler microphone is a delicate instrument that nee
48. has stabilized Use F2 to select CRV 4 Use a to select a source level of 80 dB SPL Press START to run the fourth measurement Press STOP when the mea surement has stabilized You now have a family of curves Lie neo Cag pe Len Es Curve haer Durga Compoqite GL i Dber Lrerbed Peapecied Sat Fact ipec al Figure 3 4 3A Family of curves Notice how all the curves are on top of each other This aid has very little compression between 50 dB and 80 dB SPL 72 FONIX 7000 Hearing Aid Analyzer Lee USO io elect het bee Une HDL aed WA copter AONE TIFE Fic AHULYZER ap Lett Lar Cares Character ibe Ques Seurte RAS Cor AR ieee hps rere Ae UA AN GE i D a i red tle o Source Cospodidie AST hias Chatar Lea bed Projected Moise Reduction 40 Pen START fa Pun beet at aedeeteel ire Freee ARAL for baai mirni Figure 3 4 3B Family of curves Notice how the curves show less gain as the amplitude increases This aid shows a great deal of compression between 50 dB and 80 dB 3 4 4 Deleting measurements and settings Use the F4 key to permanently delete measurement curves When you press it there are four possible selections To delete a curve 1 Press F4 Selected Curve Delete only the selected curve but keep the curve selec tions usually source type and level Sel Curve amp Settings Delete selected curve and return curve to analyzer default setting
49. hearing aids It is an alternative to the composite signals e SHORT Contains 10 different frequencies and only does one sweep It is primarily used for testing loud levels in real ear measurements 34 FONIX 7000 Hearing Aid Analyzer 2 3 1 1 Pure tone settings There are several different settings available for pure tone sweeps You can change all of them in the Setup menu see Section 2 2 Some of these settings are also available in local menus Here is an explanation of the pure tone set tings NOISE RED TONE The amount of noise reduction used in pure tone mea surements This is set independently for real ear and coupler measurements See Section 2 3 1 2 SWEEP START DELAY The amount of time the 7000 test system presents the first tone in a pure tone sweep See Section 2 3 1 3 SWEEP MEAS DELAY The amount of time each subsequent tone is presented before the measurement is made in a pure tone sweep See Section 2 3 1 3 MISC START DELAY The amount of time the 7000 test system presents the first tone in one of the following measurements reference test gain measure ments in automated test sequences averaging harmonic distortion measure ments equivalent input noise and single frequency telecoil measurements See Section 2 3 1 3 MISC MEAS DELAY The amount of time each subsequent tone is presented before the measurements is made in one of the measurements listed above See Section 2 3 1 3 I O START DELAY T
50. in dB SPL e TARG SPL The mid level target in dB SPL e UCL re The client s uncomfortable levels in dB SPL 142 FONIX 7000 Hearing Aid Analyzer e REDD The real ear to dial difference only selectable when REDD is set to CUSTOM e TARG IG The mid level target in dB insertion gain 6 Use F5 to select the signal source if you are modifying the SPL target e Select the Source Type Choose between Tone and Composite Press START to make your selection without closing the pop up window e Select the Source Level Choose between 40 through 90 dB SPL Press gt to make your selection and close the pop up window 7 Use the arrow keys to make your modifications to the target The v a keys select the desired frequency and the lt gt keys modify the amplitude 1 dB at a time Note When you edit the Target IG the Target SPL will also be updated However when you edit the Target SPL directly it will not have an effect on the Target IG FONIY TYPE 7000 ANALYZER Audi ogran lt Left gt UCL 105 x u Frye Pred lt Right gt UCL dBHL 101 102 102 101 103 105 F0 115 0 u Frye Fred 1000 1500 2000 S000 4000 6000 1tkHz32 Use UPTOWN to select frequency Use LEFT Press MENU for local menu FL F2 FS Left RECI Predict UCL Select Ear Select Cry 8000 RECI d 16 17 7 E RECI dE F4 Curve Actions
51. in the 7000 test system is that of a speech weighted set of pure tones starting at 200 Hz and ending at 8000 Hz with a gradual high fre quency roll off of 6 dB per octave The knee point of the roll off is placed at 900 Hz The spectrum was developed from data supplied by the National Bureau of Standards and is the signal used for the testing of hearing aids submitted for use in the Veterans Administration hearing aid program In 1992 the ANSI standards committee for hearing aid test standards published S3 42 1992 This standard describes a noise signal that is very similar to the one we use in the 7000 test system There are some differences mostly in the low frequencies and in the way that the signal spectral shape is specified The committee wanted a system that could be built easily by anyone and assumed that a manufacturer who would develop equipment to make tests for this stan dard would use a white noise signal to produce the roll off above the 900 Hz knee point In order to produce a signal that met with the provisions of the 83 42 standard Frye Electronics decided to slightly modify the Composite signal for use in this ANSI 1992 test sequence This modified signal is not used in the normal com posite operation of the 7000 test system Only the most critical operator will see any significant difference in the hearing aid performance between the two signals The ANSI S3 42 signal may result in an increase in noise gain by about 1 dB
52. measuring a set of binaural hearing aids both the phase and the delay graphs should match fairly closely 4 2 Battery Current Test The Battery screen lets you perform extensive tests on the amount of battery current that the hearing aid uses These tests were designed to give you a com plete picture of the amount of battery current that the hearing aid drains when exposed to different situations There are three primary tests e Static Test This test estimates the battery life of the hearing aid by pre senting the hearing aid with a single static tone e mA Freq This test measures battery current drain as a function of fre quency This shows how the battery current varies as you present the hearing aid with different frequencies e mA Ampl This test measures battery current drain as a function of amplitude This shows how the battery current varies as you present the hearing aid with different amplitudes To run these tests toggle the test status with F4 F5 and F6 respectively Pressing START will run the mA Freq and mA Ampl tests The tests will auto matically stop when finished The Static test is always on when its status has been toggled to On In order to perform these measurements you need to insert a battery pill into the hearing aid plug the battery pill into the sound chamber and push the applicable button in the chamber To enter the Battery screen from the Opening screen press F5 Other Tests Then
53. oe EEEE 157 6 5 2 Choosing a speech weighting cc cece cee eee eee e eee ee eee en eee en eee eneeee 158 6 5 3 Testing the digital filters 0 0 0 0 ccc ccc cece ee eee nee e eee e eee e ee eee tet ebeeeeeeteenae 158 6 5 4 Testing digital noise suppression 6 cece cece cence eee eee eee ee ee ee eee eee e teen ees 159 6 6 Directional Hearing Aids eses ccc tocecdceui dtd Sos aid TE bes aaia TET E ob bes scant 160 6 6 1 Using the insertion gain technique 0 cece cece cee e nce e eee n ee eee ence een eee eneees 160 6 6 2 Determining the null 2 0 0 ccc cece teen ene NE een eect eee eee NR 162 6 7 Open Ear Hearing Aids reei oniinn tee cece teen nee enn a nen een EEE eee Eee o Eee EE EEE EE EE 162 6 8 Visible Speech eici Aare e a eh Ae ed E a eed es MAAS do RE oe La eed da E 163 6 8 1 Performing Visible Speech measureMent 0 cece cece cece eee e eee e ee eee eee eeeeeaaee 164 6 8 2 Viewing the Real time Visible Speech Display 00 ccc cece cece eee e eee e tence eeaeees 165 6 8 3 Viewing Completed Test Results 00 0 cece cece cece cence eee e erence tenet een eee ee eens 165 6 8 4 Measuring multiple envelopes ccc cece cece ence een cnn eect e nett nese sane eee eees 166 6 9 CROS BICROS Aids rna cctv eetiah doen E r ATR SAG ee ee ERs Pe a 167 6 9 1 Measuring the Head Baffle Effect 0 0 cece cece cece eee cece nee ee eee ee eneeeeeeeeaaee 168 6 9 2 Measuring th
54. press F1 Battery Test A short list of the functions of this screen can be displayed by pressing HELP Note Many hearing aids do not vary when exposed to signals of varying fre quency and amplitude For those hearing aids you will see a flat horizontal line when running both the mA Freq and mA Ampl measurements Automated Test Sequences 101 FISD MPE Pe Ee heey Laft E BH roe plita O cI BA frequency 208s Hr E J eee Intiery La V ciecAtr Cri baii Battery Lifa e ae GAJ Frequency 1000H Li Ulan i Pare i ep litude fo Fl LILI pt Ge fet pereetere Une AL eacrophcne and HA coupler Frer SIRRI te rum tert Fi Fe Fz Fi 4 FE Fr Fg SENF i Left Ear Prelims OF Dh On ors ae ae mee See hgs Genie Tet aF wait Beat Sine oc 07ra Figure 4 2 Battery Current Test mA Freq graph mA Ampl graph Static test estimated battery life Selected test settings Bw N e 4 2 1 Static Test Estimated Battery Life The Static test estimates the battery life of the hearing aid To turn on the test 1 Enter the Battery screen as described above 2 Use F7 to set the battery size Press F7 Use v a to select the battery size of the hearing aid Use gt to complete the selection and close the pop up menu 3 Use F4 to toggle the Static Tone to On The estimated battery life should now be displayed below the ma Freq graph See Figure 4 2 By default this test uses a pure t
55. refer ence test gain and harmonic distortion measurements This will increase the amount of time it takes for the test but it should increase the accuracy of the test for adaptive AGC aids Note The Adaptive aid type category was created for a specific type of adap tive AGC aid such as the model created by Telex 2 3 1 4 Harmonic distortion Harmonic distortion occurs when a hearing aid clips the peak of a pure tone input signal resulting in artifacts at harmonics integer multiples of that input signal For example if you present a 500 Hz tone to the hearing aid distortion artifacts could occur at 1000 Hz and 1500 Hz The harmonic distortion measurement is expressed as the percentage of the power of these distortion artifacts to the power of the input signal All hearing aids will have some amount of distortion Usually the strongest artifacts occur at the second and third harmonics of the frequency With the 7000 Test System you can test the amount of distortion available in the second harmonics the third harmonics or both harmonics considered total harmonic distortion Definitions 2nd Harmonic Energy of the second harmonic or twice the presented frequency 3rd Harmonic Energy of the third harmonic or three times the presented fre quency TOTAL Combined 2nd and 3rd harmonic distortion See Section 3 4 7 for instructions on performing the harmonic distortion mea surement 2 3 1 5 Pure tone Filter
56. sound going into the hearing aid is a continuous signal that could be regarded as noise If the aid decides that the sound is noise it lowers the gain at the corresponding frequencies Conventional testing techniques such as a pure tone sweep or the Composite signal can cause the high end digital aid to go into this noise reduc tion mode This means that the gain or output you see on the analyzer s display will not necessarily reflect the normal response of the aid in speech The Digital Speech signal was developed in order to test noise reducing digital hearing aids without fear of them going into noise suppression mode It does this by taking the standard Composite signal and interrupting it randomly The digital hearing aid responds to this modulated signal as it would respond to nor mal speech 3 5 1 Using Digital Speech The 7000 analyzer seamlessly incorporates the testing of digital hearing aids into its normal testing procedures To test a digital hearing aid follow the steps outlined in Section 3 4 2 choos ing DIG SPEECH in Step 3 Digital Speech can be used to accurately test any hearing aid so if you arent sure if the hearing aid is digital you can always use Digital Speech and be assured that the frequency response is correct 3 5 2 Changing the Speech Shape By default the Digital Speech and Composite signal use the ANSI S3 42 speech weighting This speech weighting rolls off the high frequencies at a rate of 6 dB p
57. source settings of REAR 3 Therefore to match the frequency response to a non NAL NL1 target use F2 to select REAR 3 and perform the measurement REAR 3 can be compared to the M tar get Make any necessary adjustments to the hearing aid fitting and use the START and STOP keys to make another measurement If desired use F2 to select 150 FONIX 7000 Hearing Aid Analyzer another measurement curve It is recommended to perform real ear measure ments as 50 65 80 and 90 dB SPL For this reason the default source levels of REAG 2 5 are set accordingly Use the up down arrow keys to change the select ed source amplitude at any time 6 4 5 Working with prescription targets The 7000 Hearing Aid Test System has the following fitting rules available NAL NL1 NAL RP 1 3 Gain 1 2 Gain 2 3 Gain Berger and POGO The NAL NL1 fitting rule is non linear and changes depending upon the amplitude of the input signal The other fitting rules are linear and provide the same amount of gain regardless of the input level To display a target the clinican must enter the patient s audiogram in the Audiogram Entry screen See Section 6 3 1 Values must be entered at 500 1000 2000 and 4000 Hz or the target will not be displayed The NAL NL1 target has a number of settings associated with it that will change the prescription Press MENU in the Audiogram Entry screen Insertion Gain or Real ear SPL screen to change the current sett
58. subtracting 20 dB F1 is where the RESP 50 curve crosses the response limit level on the way up F2 is where the RESP 50 curve crosses the response limit level on the way down HFA SPA Three frequency average chosen in the MENU TDH total harmonic distortion measurements and the frequencies and amplitudes at which they are taken HFA SPA SPLITS Three frequency average of the telecoil frequency response curve RSETS The difference between the HFA SPA of the microphone response curve and the telecoil response curve Battery Current measurement T O curves the input output measurements taken of AGC aids Only selected frequencies are tested 114 FONIX 7000 Hearing Aid Analyzer 18 I O curve selection box the key to the I O graph listing which frequencies go with which curve 19 Attack and release measurements including the frequencies at which they were measured Test Result Differences with ANSI 96 and ANSI 87 e In ANSI 87 and ANSI 96 the response curve 2 is sometimes measured at 50 dB SPL e In ANSI 87 I O 17 is only measured at 2000 Hz e In ANSI 87 attack and release 19 is only measured at 2000 Hz e In ANSI 87 AGC aids are measured at full on gain for the entire test sequence e In ANSI 87 the OSPL90 curve is called SSPL90 e In ANSI 96 RSETS 15 is called STS SPLITS e In ANSI 87 the telecoil measurement 3 14 15 is much different There is only one measurement called TCOIL 10 mA m
59. table from ANSI S3 6 1989 Table G 1 FREQ Hz 250 500 750 1000 1500 2000 3000 4000 6000 8000 TABLE 4 HTL HL to UCL HL prediction table from Pascoe 1988 Table 4 HTL UCL dBHL HL 0 5 10 15 20 25 30 35 40 45 50 55 60 HTL dBHL 65 70 75 80 85 90 95 100 105 110 UCL HL 114 115 117 120 120 124 130 127 133 134 137 140 196 FONIX 7000 Hearing Aid Analyzer Appendix G 197 Glossary of Terms AGC AIDED RESPONSE AMBIENT NOISE ANECHOIC CHAMBER AMPLITUDE ANSI ARTIFACT ASP AVG BATTERY SUBSTITUTION PILL BERGER BIAS FREQUENCY BIAS AMPL Automatic Gain Control or Automatic Volume Control A feature on a hearing aid that automatically adjusts the gain depending either on the input level AGC I or the output level AGC O Also known as Compression The response of a hearing aid in place on the ear Also called In situ Response Subtract the Unaided Response from the Aided Response to get the Insertion Gain Response When the Aided Response is measured in a real ear as opposed to a manikin it is called the Real Ear Aided Response or REAR The environmental sounds in a testing area A room with little sound reverberation a room constructed to be acoustically absorptive A measure of the magnitude of a signal American National Standards Institute A national organization that dete
60. ter may be in the chamber while the receiver is on top of it If you are using a CRT monitor it may be necessary to turn it off while testing these aids because CRT monitors create magnetic fields which may interfere with testing Either turn the monitor back on to view results or push PRINT to print LCD monitors should not cause interference Wireless CROS A CROS Contra lateral Routing of Signal aid consists of a transmitter and a receiver so that sound received on one side of the head can be transmitted to the other side without a wire connection You can test these units in the test chamber of the FONIX 7000 Test System See Figure 3 3 7 1 Place the microphone of the transmitter at the reference point in the test chamber Turn on the transmitter 2 Close the lid of the test chamber 3 Check the specification sheet of the aid under test to determine how far apart to place the transmitter and the receiver About 6 15 cm is usually sufficient Basic Sound Chamber Tests 67 Receiver Coupler Assembly located parallel to Transmitter at specified distance d see manuf specs Transmitter located at Reference Point Place foam under assembly if necessary to achieve specified distance d Figure 3 3 7 Testing Wireless CROS Hearing Aids 4 Place the receiver on top of the lid of the test chamber The total depth of the lid of the test chamber is about 5 inches 14 cm To increase the total separa
61. the IEC screen The instrument will run a measurement and then pause Turn the gain of the aid down to the reference test position Match the target value within 1 dB Press START to complete the test sequence Press PRINT to print test results 5 3 3 Viewing IEC Results 1 GOETS ae oe RDS OSPL 90 response curve RESP curve measured at reference test gain at 50 or 60 dB SPL Full on gain curve Output of 90 dB at reference test frequency Maximum output and its frequency Reference test gain calculated target FOMIX TYPE 7000 ANALYZER IEC 118 7794 14mm MIC Left Ear QUALITY INSPECTION METHOD AGC FOGS0 d Ref Freq 1600 Hz OSPLIO D lTotal Harm Distortion e 1600Hz 104 5 a Q O 1 2 LO00Hz 70 dB Max 1200Hz 119 9 dR G T Input Noise 23 2 dB Reference Test Gain Calculated 29 5 dB Battery 1600 Hz 60 dB Measured 29 5 d 13 Zine Air_ 1 19 mA 5 1 khz 2 O 0SPL90 F FOG5O R RESPEO F 1600 Hz 1 0 Curve 30 dBIN 70 BO LEVELED Test Completed Press START to run test again User 1 2003 08 11 15253319 FL Fa F4 Fa FE 50 1600 1000 Curve Fa FOG Ampl Ref Freg Dist Freg Actions Select Aid Type Figure 5 3 3 IEC test results 122 FONIX 7000 Hearing Aid Analyzer 7 Reference test gain measured actual 8 Reference frequency 9 Total harmonic distortion 10 Equivalent input noise measurement 11 Battery current drain 12 I O
62. the leveling process Press F2 from the Opening screen to enter the Real Ear Navigation screen Press F3 or F4 from the Real Ear Navigation screen to enter either the Insertion Gain screen or the SPL screen respectively Press LEVEL The instrument will attempt to level the sound field speaker There are three leveling statuses a LEVELED This indicates the leveling process was correct within 1 dB b LEVEL FAILED This indicates that the leveling process is incorrect by at least 6 dB c SEMI LEVELED This indicates that the leveling process was correct between 1 dB and 2 dB d WEAK LEVELED This indicates that the leveling process was correct between 1 dB and 2 dB but that the maximum output that the speaker can produce is less than 80 dB SPL To produce a louder signal move the speaker closer to the patient and re level Real Ear Measurements 135 If the instrument didn t successfully level there are several things you can try e Check the position of the sound field speaker It should be 12 to 15 inches from the client s head e Make sure the microphones are securely plugged into the remote module e Make sure the front of the reference microphone is as close to the client s head as possible e Check the calibration of the loudspeaker and microphones See Appendix B e Check the noise level in the room It may be necessary to change or cor rect the sound field environment See Section 2 8 fo
63. the position of the sound field speaker can be used to determine the null of the directional microphones The null is the azimuth at which the directional hearing aid provides the least amount of amplification To determine the null follow Steps 1 8 in Section 6 6 1 to measure the reverse curve While performing this measurement move the sound field speaker around the patient this is easier using a speaker on a swing arm than a floor stand Try to keep the speaker equal distance from the patient while moving the speaker in a semi circle behind him Look at the frequency response as the speaker is moved If the aid is direc tional its frequency response will decrease as the speaker is moved from the front of the patient to the back of the patient The angle at which the frequency response is at its lowest is the null of the directional hearing aid 6 7 Open Ear Hearing Aids Open ear hearing aids require additional consideration during real ear measure ments because of the special technology used by these aids to eliminate feed back This feedback suppression technology can interfere with the sound field measured by the reference microphone outside the ear Therefore in order to get an accurate real ear measurement of an open ear hearing aid the reference microphone of the 7000 Hearing Aid Test System should be disabled To set up the analyzer for open fit real ear testing Enter the Real ear Insertion Gain or Real ear SP
64. the test sequence in the Coupler screen See Figure 3 4 6 To do this 1 2 Press MENU from the Coupler screen Use v a to select Static Tone under Source Settings 74 FONIX 7000 Hearing Aid Analyzer Use lt gt to choose AVERAGE Use v a to select Avg Freqs under Aid Settings Use lt gt to choose the highest frequency of the three frequency average See Section 2 3 1 1 for a complete list of frequencies Press EXIT to return to the Coupler screen The three frequency average will automatically be running Adjust the amplitude using the v buttons FONIX TYPE 7000 ANALYZER Coupler Left Ear Curve Characteristics Curu lt Source gt RMS Cor NR Name Type Trans Amp Out Cle CLS CL4 CLS E Chamb C C E c CLE CHI C c E C Chamb Chamb Chamb Chamb Chamb Chamb Chamb Chamb Chamb CLF CLS Cla CLE DUD TDD ource Static Tone Avg Chamber Leveled Noise Reduction Off Max 47 8 dB Gain Battery Current 1 19 mA Source Measuremerr Type 13 Zinc Air Ampl Freq Ampl Dist dBSPL Hz dBGain 65 1000 28 6 Use UP TOWN to select test level Use ML 50E and HA coupler Figure 3 4 6 Measuring a three frequency average 3 4 7 Measuring Harmonic Distortion Harmonic distortion is when the hearing aid returns energy at frequencies not present in the source signal The 7000 analyzer allows you test for this phe nomenon ve
65. their circuits to settle This additional delay time can be changed in the MISC MEAS delay setting that is available in the local menu of the mea surement screens and in the Setup Menu The MISC MEAS setting is automati cally adjusted according to the aid type selected This setting is added to the 60 ms minimum measurement time The default settings are STANDARD linear 20 ms AGC 100 ms ADAPTIVE 2000 ms The signal off time is random between 100 and 300 milliseconds This time is not controllable by the user 2 4 Printing The 7000 test system comes equipped with an internal thermal printer The thermal printer prints a clear easy to read image of the display You can also hook up an external printer to print your results on normal office paper You can use any external printer that supports HP PCL Hewlett Packard Printer Computer Language version 3 0 or the Epson ESC P2 printer language 2 4 1 Choosing a printer You can set which printer to use in any local menu If you want to set the printer language or whether to print in color or black amp white you will need to use the Setup menu shown in the next set of instructions To choose the printer in the local menu 1 Press MENU from any measurement screen to open a local menu 2 Use v a to select Printer under Misc Settings You can use the START button to skip ahead sections in the local menu 3 Use gt to make your printer selection INTERNAL o
66. time each subsequent tone is presented before the measurements is made in one of the measurements listed above See Section 2 3 1 3 Misc Settings Battery Meas Status of the battery current measurement Choose ON or OFE Battery Size Size of battery used with the hearing aid being tested Print Label Status of the printing label Choose ON or OFF Printer Printer used for printouts Choose INTERNAL or EXTERNAL See Section 2 4 Chapter 4 97 Advanced Coupler Tests 4 1 Enhanced DSP The Enhanced DSP measurement screen was designed to give you more infor mation about digital hearing aids The new technology in digital hearing aids has added a great deal of capability such as increased clarity and flexible pro gramming However the same technology can also have its pitfalls This test will tell you the digital processing delay also known as group delay and the signal phase of the hearing aid The digital processing delay measurement will help you determine whether or not a hearing aid is suitable for a monaural fitting The phase measurement will help you determine whether custom binaural hearing aids are working properly together as a team 4 1 1 Digital Processing Delay One of the properties of digital technology not normally mentioned in the litera ture is that it always takes time to process digital data Imagine the digital hear ing aid as a miniature computer it takes an analog sound wave turns it into digital i
67. 0 Hearing Aid Analyzer 1 If desired follow the instructions in Section 3 8 2 to load a test sequence You can do this by following the directions in Section 3 8 1 to create a new sequence or by loading a previously saved sequence by following the direc tions in Section 3 8 2 2 Use F6 to select SEMI AUTOMATIC Press F6 Use v a to select SEMI AUTOMATIC Press gt to complete the selection and close the pop up menu 3 Use START to start the automated test sequence If you are using a source of type COMPOSITE DIG SPEECH or FAST press STOP to stop the mea surement when it has stabilized The 7000 analyzer will automatically advance the curve selection to the next curve 4 Make any desired adjustments to the hearing aid and repeat Step 3 until you have measured all your curves Use F6 to turn the AUTO TEST OFF when you want to return to normal test ing mode 3 9 Complete List of Menu Items The function of all items in the local menu of the Coupler screen are described in this section Enter the local menu by pressing MENU in the Coupler screen Selections are made by using v a to choose an item and lt gt to change the setting There is a dotted or dashed line in between an item and its selection If the line is dotted the selection will only effect the Coupler screen If the line is dashed the selection is global and will have an effect on other measurement screens The local menu is divid
68. 000 Hz measured data points from three consecutive fre quencies 100 Hz apart are averaged to get the curve point at the center frequency e From 2000 Hz 3000 Hz measured data points from five consecutive fre quencies 100 Hz apart are averaged to get the curve point at the center frequency Real Ear Measurements 155 e From 3000 Hz 8000 Hz measured data points from seven consecutive frequencies 100 Hz apart are averaged to get the curve point at the center frequency In normal pure tone log smoothing Each center frequency is smoothed by averaging it together with the out puts from the next upper and lower 12th octave frequency To turn on off log smoothing Enter the measurement screen Press MENU to enter the local menu Use v a to select Smoothing under Display Use lt gt to choose LOG or OFF Press EXIT to return to the measurement screen All measurements will have the chosen smoothing status BR N e e i lt 5 mero 4 3 Figure 6 4 11 A comparison of a smoothed top and unsmoothed bottom curve 156 FONIX 7000 Hearing Aid Analyzer 6 4 12 Using Output Limiting When performing real ear measurements it is very important not to expose your Client to noises that could conceivably further damage his hearing For this reason the 7000 test system has built in output limiting When the probe microphone reads a value above the output limit at any frequency the test will automatic
69. 03 ICRA 84 158 IEC 120 IEC 60601 14 IEC Option 3 IG DATA 153 Infant earhook 8 Insertion gain 143 149 150 160 Intermodulation distortion 38 76 ITE 60 J JIS 123 125 L Label 43 LEDs 12 LEVEL 12 28 Leveling 57 108 removing 58 saving 58 sound field 133 sound field speaker 133 Local menu coupler screen 94 Location of 7000 17 Loudspeaker Floor Stand 6 LTASS 145 M1750E microphone 20 mA Ampl 102 mA Freq 100 102 Maintenance 19 MENU 12 Menu local 27 pop up 24 26 setup 28 Microphone Adapter 5 Misc Meas Delay 96 116 123 125 Misc Start Delay 95 116 123 125 Monitor headset 7 MZ couplers 8 89 N NAL NL1 149 Navigation 24 25 128 Index 207 Noise reduction 35 38 88 Noise Red Comp 95 Noise Red Tone 95 115 122 125 Noise suppression 84 86 88 159 NORMAL 33 69 O Occluded ear simulator 89 Occlusion effect 156 OES 89 OES Option 3 Open ear 62 162 Option 115 OSPL90 115 Output 147 Output limit 156 Output limiting 156 Output Trans 95 P Phase 98 Powering 19 Prescription targets 150 PRINT 12 28 Printer 96 116 120 123 126 choice 42 error messages 44 external 48 internal 44 label 43 loading 45 Printing 42 Print Label 96 116 120 123 126 Probe tube 7 130 Program mode 91 Pure tone delay 35 display 55 FAST 69 fast 33 noise reduction 35 NORMAL 69 normal 33 settings 34 SHORT 69 short 33 Pure tone signals 33 R REAG 144 148 See REAR R
70. 2 5 1 Viewing the Curve Characteristics Box Each measurement screen has a Curve Characteristics Box that tells you differ ent information about each measured curve It has several different columns of data Curve Name Curve Title real ear only Source Type Source Transducer Source Amplitude RMS Out Correction Factors COR coupler only and NR Noise Reduction Figure 2 5 1 shows an example Figure 2 5 1 Curve Characteristics Box FONIY TYPE 7000 ANALYZER Coupler Left Ear Curve Characteristics Curvy lt Source gt RMS Cor NR Name Type Trans Amp Out p P F P P P P P P P Chamb Chamb 70 70 1 4x 7 63 5 CIC 4x Chamb 60 Chamb Chamb Chamb Chamb Chamb Chamb Chamb 50 FONIX 7000 Hearing Aid Analyzer Curve Name This identifies the name of each curve The first letter is derived from its measurement type coupler C or probe P The second letter is derived from its ear left L or right R Coupler curves can also be labeled A and B The third letter is the number of the curve CR1 is the first coupler curve for the right ear PL2 is the second probe curve for the left ear Curve Title This identifies the title of the real ear curve It is only available in the real ear measurement screens Here are the possible titles REUR real ear unaided response REAR real ear aided response REIG real ear insertion gain TARG real ear target HTL hearin
71. 2 for the following explanation of test results OSPL90 response curve Full on gain response curve measured at 50 or 60 dB SPL Response curve measured at reference test gain at 60 dB SPL Output with a 90 dB input at 500 Hz Output with a 90 dB input at the reference frequency Maximum output and the frequency at which it was measured Gain of the FOG curve at the reference frequency Reference test gain calculated target GO GOs a SOU a E a Reference test gain measured actual 10 Equivalent input noise 11 Response limit and the two frequencies F1 and F2 at which the response curve crosses its horizontal line 12 Total harmonic distortion at 500 800 and 1600 Hz 13 Battery current drain with 60 dB input at the reference frequency 14 I O curve measured at the reference frequency 15 Attack amp release measurements at the reference frequency Automated Test Sequences 125 5 4 3 Viewing JIS measurements in the Coupler screen It is possible to copy JIS response curves to the Coupler screen where they can be compared to other response curves To do this AeA wo N e 5 Run the JIS test sequence Press F7 Use a to select Store Crvs Coup if necessary Use gt to store the curves that is copy them to the Coupler screen and close the pop up menu The following is a list of where the curves are cop ied in the Coupler screen Any previous measurements stored in those curve locations will be overwri
72. 2100 2200 23001 24001 25001 26001 2700 2800 2900 S000 S100 S200 3300 3400 z500 z600 S700 z800 z900 400 4100 4200 4300 4400 4500 4600 4700 4800 4300 5000 5100 5200 5300 5400 s50 5600 5700 5500 5900 6000 84 1 84 0 Chamb Chamb Chamb Chamb Chamb Chamb Chamb Chamb Chamb Chamb 81 7 80 1 70 5 7 3 76 7 CL CLS Cla CL 76 9 TTA 70 4 TIF 79 8 70 6 Source Composite ANSI Weighted Chamber Leveled 4 3 72 94 Projected Noise Reduction 4k mo t OW Oe e Source 65 dESPL Use UP DOWN to select test Press START to run test at selected curve Press MENU level Use M1750E and HA coupler or local menu FA F2 Left Ear i Select Cry Select Dn OFF FS FE Composite off Src Select Auto Test Fa Off Prev Curvets Toggle 2003 05 29 12 46 13 Figure 2 5 2 Data display of a composite measurement 2 6 Computer Connection The 7000 test system is equipped with an RS232 connection that will allow you to connect to a personal computer and exchange data You will also need a software program such as WinCHAP on your Windows computer that can com municate with the analyzer It is possible to make your own program using the FRYERS protocol 2 7 Remote Module The remote module is a way of operating the 7000 away from the main module itself This is especially helpful for performing real ear measurements T
73. 3 ANSI 92 test results 5 2 4 Viewing ANSI measurements in the Coupler screen It s possible to copy ANSI response curves to the Coupler screen where they can be compared to other response curves To do this Run the ANSI 92 test sequence Press F6 1 2 3 Use v to select Store Crvs Coup if necessary 4 Press gt to store the curves and close the menu The following is a list of where the curves are stored in the Coupler screen Any previous measure ments stored in those curve locations will be overwritten 50 dB SPL CRV3 e 60 dB SPL CRV4 e 70 dB SPL CRV5 e 80 dB SPL CRV6 e 90 dB SPL CRV7 5 Press EXIT and F1 to enter the Coupler screen and view the ANSI response Curves 120 FONIX 7000 Hearing Aid Analyzer 5 2 5 Explaining the Menu Settings 5 3 IEC There are only a couple of menu settings in the local menu of the ANSI 92 screen Misc Settings e Print Label Status of the printing label Choose ON or OFF e Printer Printer used for printouts Choose INTERNAL or EXTERNAL See Section 2 4 The International Electro technical Commission IEC standard in the interna tional community is analogous to the ANSI standard in the United States Press F6 from the Opening Screen to enter the IEC Screen The IEC 118 7 standard was amended in 1994 and in July of 1995 the IEC Option was changed to conform to that amendment The IEC standard is the equivalent of the Chinese National
74. 4 1 2 Signal Phase The signal phase measurement is a test of the pushing and pulling of the amplified sound of the hearing aid Vibrations in the air create sound these vibrations can be thought of as air pushing and pulling against the ear If sound goes through a hearing aid the hearing aid might cause a phase shift turning a push of the sound wave into a pull This isn t necessarily a bad thing there may be good reasons for a phase shift of the sound wave The components of a custom hearing aid are usually wired by hand The receiver is typically wired into the amplifier in such a way that it may or may not cause a phase shift of the signal If care is not taken it s entirely possible to wire one hearing aid of a custom binaural set one way and wire the other aid in the opposite way This could cause one of the hearing aids to be pulling while the other aid is pushing resulting in strange sound quality for the hearing aid wearer We propose that it could be very important to check the signal phase of the hearing aids when fitting a client with a binaural set in order to ensure that the aids are working together as a team Technical Details The signal phase measurement works by generating a 1 kHz cosine wave turn ing it into a test signal and delivering it to the aid The cosine wave signal is offset at the time of generation so that it starts at the baseline the zero point Automated Test
75. 5 1 for more details Signal type and leveling status Selected noise reduction Maximum output and three frequency average of the selected curve Source Signal Statistics Box Displays the source amplitude frequency dis tortion and output gain 3 1 2 Viewing a Composite Display FONIY TYPE 7000 ANALYZER 0 Coupler Left Ear Curve Characteristics Cury lt Source gt RMS Cor NR Name Type Trans Amp Dut Chamb Chamb Chamb CL4 Chamb CLS Chamb P CL2 CHF P P F CLE CFP Chamb F F P P CL3 CL Chamb CLS Chamb Cla Chamb CL Chamb Source Composite ANSI Weighted Chamber Leveled Projected Noise Reduction 4k 5 kHz 2 4 Source 65 dESPL 6 Use UP DOWN to select test level Use M1750E and HA coupler Press START to run test at selected curve Press MENU for local menu FL F2 FS FE F FE Left Ear i Composite off OFF Prey 2003 05 29 Select Cru Select On Off Curvets Src Select Auto Test Toggle 12355239 Figure 3 1 2 Coupler screen with a Composite source Refer to Figure 3 1 2 for the following explanation of the graphical display 1 Type of display This will be either dB SPL coupler output or dB Gain cou pler gain Selected ear Curve Characteristics box See Section 2 5 1 for more details Basic Sound Chamber Tests 57 4 Signal type speech weighting leveling status and bias status Digital
76. 6 Press START to start the test If performing a SINGLE test use lt gt to adjust the frequency of the tone 7 Use v a to adjust the amplitude of the test signal 8 Press STOP when the measurement is complete 6 4 8 Using the reference microphone When determining the gain of a hearing aid the analyzer normally subtracts the response measured by the probe tube from the sound field measured by the ref erence microphone positioned outside the ear This occurs when the reference microphone is ON If you are in a particularly noisy environment or if you are testing an open fit hearing aid the reference microphone measurement could introduce unwanted artifacts into your testing When the reference microphone is disabled the analyzer uses the information determined during the leveling process to determine the signal outside the ear during the measurement It is very important that the patient remain still after leveling and that the sound field is undisturbed particularly if the reference microphone has been disabled To enable disable the reference microphone 1 Enter the Real ear Insertion Gain or Real ear SPL screen Press MENU to enter the local menu Select Reference Mic using v a under Measurements Use lt gt to choose ON or OFF Press EXIT to return to the measurement screen a FF WwW N 6 4 9 Viewing numerical curve data The frequency response curves measured by the 7000 test system can be vie
77. 7000 Hearing Aid Analyzer 3 3 3 Behind The Ear BTE Aids 1 Insert the coupler microphone into the HA 2 2 cc coupler 2 Couple the aid to the HA 2 coupler using the ear level adapter There should be 0 4 inches 10 mm of tubing between the nub of the ear level adapter and the nub of the coupler adapter See Figure 3 3 1 C 3 Place the microphone of the hearing aid at the reference point in the cham ber as shown in Figure 3 3 3 4 Close the lid and test as desired af ee Figure 3 3 3 Behind the Ear Aid with Ear level Adapter 3 3 4 Open Ear Hearing Aids Open ear style hearing aids have boomed in popularity over the past couple of years Unfortunately the ANSI standards have not yet caught up with them At the moment there is no standardized method of performing a coupler mea surement on an open ear style hearing aid Hearing aid manufacturers have independently developed different mechanisms for attaching an open ear hear ing aid to an HA 1 or HA 2 coupler One such device pictured in Figure 3 3 4A is attached to the speaker unit of the open ear hearing aid and to the tubing of an HA 2 coupler Other connecting devices consist of a plate that attaches to an HA 1 coupler To perform a coupler measurement to the ANSI S3 22 standard we recommend using Fun Tak to connect the speaker unit of the open ear hearing aid to an HA 1 coupler as pictured in Figure 3 3 4B We believe that the HA 1 coupler is better than t
78. ANSI S3 22 standard 108 FONIX 7000 Hearing Aid Analyzer Here are the main differences between ANSI 87 and ANSI 96 AGC aids are tested at reduced reference test gain in ANSI 96 but tested at full on gain in ANSI 87 This will have an effect on nearly all measure ment results in the ANSI test sequence The input output and attack amp release measurements are performed at up to five different frequencies in ANSI 96 ANSI 87 only measures those functions at 2000 Hz ANSI 96 measures the telecoil function of all aids using a telecoil device with a stronger magnetic field than the telecoil device used by ANSI 87 and a whole frequency sweep of measurements is performed in ANSI 96 instead of only one measurement at a single frequency in ANSI 87 Here are the main differences between ANSI 96 and ANSI 03 In ANSI 03 the frequency response curve is always measured at 60 dB SPL In ANSI 96 AGC aids are tested at 50 dB SPL At the beginning of an ANSI 03 test AGC aids should be set to have mini mum compression Just before the I O and attack and release measure ments the analyzer will pause to let you turn on the compression con trols to maximum The EIN measurement uses a 50 dB SPL input instead of a 60 dB SPL input This should give better results of AGC aids with knee points between 50 and 60 dB SPL In ANSI 96 full on gain is measured at 50 or 60 dB SPL for linear aids and 50 dB SPL for AGC aids In ANSI 03 full on ga
79. Adapter 14 mm to 1 25 4 mm adapter for coupling the M1950E microphone and reference microphone to a 1 inch device such as a sound level calibra tor Test Chamber Cable Connects the main module to the test chamber Battery Substitution Pills Used to power hearing aids measure battery drain and estimate battery life Standard sizes 675 76 13 312 10A 230 Sound Chamber Replacement Feet Maintenance Manual upon request at time of purchase FONIX 7000 Hearing Aid Analyzer 1 4 2 Real Ear Accessories When the Real Ear Option is ordered the following accessories are included Remote Module and Microphones The remote module allows the user to control the analyzer while remaining close to the patient The probe and ref erence microphones used for perform ing real ear measurements are plugged into this module Sound Field Speaker Produces the output for most real ear measurements The Real Ear Option can be ordered with a floor stand remote module shelf or with a swing arm Loudspeaker Floor Stand The lightweight sturdy floor stand is adjustable and has a low profile tripod base Remote Module Shelf The shelf fits directly on the floor stand providing a stable convenient platform for operating and storing the remote module This is the default configuration Loudspeaker Swing Arm This swing arm may be substituted for the speaker floor stand amp shelf It is a convenient device that c
80. Ambient Noise Isolation Color Size Weight SHIPPING INTERNATIONAL 25 pin D female HP compatible Epson Stylus series HPCL3 and ESC P 2 FONIX FC 7020 7 x 7 5 x 1 5 deep 17 8 x 19 1 x 3 8cm SPL at test point will change less than 3 dB above 1 kHz when lid is raised w o feedback compensation 45 dB at 1 kHz allows THD measurement to within 3 at 60 dB source level and a 60 dB ambient Gray with black trim Black and white test area 13 5 W x 18 H x 11 5 D 34 3 x 45 7 x 29 2cm 36 lbs 16 3 kg Total Shipping Weight with Quik Probe Option 97 lbs 45 kg Total Shipping Weight without Quik Probe Option 77 lbs 35 kg STANDARD ACCESSORIES FONIX M1950E Low Noise 14 mm diameter pressure type Electret Microphone Microphone Adapter HA 1 Coupler HA 2 Coupler with add only memory chip 149 dB maximum SPL 044 1006 01 14mm to 1 25 mm 044 1003 03 Dimensions per requirements of ANSI S3 7 1995 for testing all in the ear aids and earmolds 044 1001 04 Dimensions per requirements of ANSI S3 7 1995 for testing ear level eyeglass and body aids 176 FONIX 7000 Hearing Aid Analyzer Ear Level Adapter Sound Chamber Cable Battery Pills Roll of Printer Paper Operator s Manual OPTIONAL ACCESSORIES Video Display Monitor 6 cc Coupler Test Chamber Stand Quest QC 10 Sound Level Calibrator Telewand Telecoil Induction Loop Battery Pills Maintenance Manual
81. B S 31 HTL 8dB S 31 HTL 3dB S 31 HTL 1dB S 31 HTL 1dB S 31 HTL 1dB S 31 HTL 2dB S 31 HTL 2dB S 31 HTL 2dB S 31 HTL 2dB S Where you calculate X and S Slope correction values as follows a T HTL 500Hz HTL 1000Hz HTL 2000Hz b If T is less than or equal to 180dB then X 05xT If T is greater than 180dB then X 05 x 180dB 116 x T 180dB If the HTL at 2000 Hz is less than 95dB S 0 If the HTL at 2000 Hz is greater than or equal to 95dB then apply the following slope correction factors at each frequency based on the 2000Hz measurement 2000Hz 250 500 750 1000 1500 2k 3k 4k 6k 8k HTL dB 95 100 105 110 115 120 1 2 2 190 FONIX 7000 Hearing Aid Analyzer POGO Prescription of Gain Output POGO for Hearing Aids by Geary A McCandless PhD amp Poul Erik Lyregaard MSc Hearing Instruments vol 34 1 1983 Required insertion gain is calculated as follows Frequency Hz Insertion Gain dB 250 1 2 HTL 10 dB 500 1 2 HTL 5 dB 750 1 2 HTL 2 5 dB 1000 1 2 HTL 1500 1 2 HTL 2000 1 2 HTL 3000 1 2 HTL 4000 1 2 HTL 6000 1 2 HTL 8000 1 2 HTL Note Frequencies preceded by an asterisk are interpolated because the article does not reference them BERGER A Method of Hearing Aid Prescription by Kenneth W Berger PhD Eric N Hagberg M A amp Robert L Rane PhD Hearing Instruments July 1978 Required
82. Board Testing with the Telewand When the ANSI Option is ordered with the 7000 Hearing Aid Test System the Telewand device is also included Otherwise you can order it from the factory as an optional accessory The Telewand is supposed to provide a more realistic test of the telecoil features of a hearing aid than the built in telecoil board in the sound chamber because it more closely simulates the magnetic field pro duced by a telephone receiver 1 2 Follow steps 1 5 in the section above Hold the hearing aid in one hand and the Telewand in the other hand Position the Telewand as you would position the receiver of a hearing aid That is hold the Telewand a few millimeters next to the hearing aid posi tioned parallel to the body of a BTE aid or against the faceplate of an ITE aid Look at the RMS OUT in the Curve Characteristics box This shows the cur rent output of the hearing aid to the magnetic field input Position the hearing aid with the Telewand held against it for maximum output For BTE hearing aids this usually occurs when the body of the aid 80 FONIX 7000 Hearing Aid Analyzer is in a vertical position If necessary use Fun Tak to help hold the aid in that position See Figure 3 4 10B 5 Use a v to change the intensity of the magnetic field The choices are OFF 1 00 1 78 3 16 5 62 10 0 17 8 31 6 56 2 and 100 mA m 31 6 is the default source intensity 6 Press STOP to stop the measur
83. CROS Aids When performing real ear measurements on a Body aid CROS or Bi CROS aid we suggest the following setups and procedures Four Goals 6 9 1 Measuring the Head Baffle Effect 6 9 2 Measuring the Overcoming of the Head Baffle Effect 6 9 3 Measuring the Overall Insertion Gain 6 9 4 Measuring the Insertion Loss to the Good Ear Each of these measurements uses the insertion gain measurement technique taking advantage of the fact that the insertion gain is a difference curve between two measured curves usually the unaided and aided response The techniques assign the label of unaided to one measurement and a label of aided to another measurement Take all measurements in the Insertion Gain Screen For measurements labeled Unaided even if they aren t unaided follow the instructions in Section 6 4 1 2 For measurements labeled Aided even if they aren t aided follow the instructions in Section 6 4 1 3 FONIX 7000 Hearing Aid Analyzer 6 9 1 Measuring the Head Baffle Effect The measurements described in this section are for both CROS and BI CROS hearing aids Unaided Real Ear response on bad ear side Set up the 7000 test system as follows e System UNLEVELED e Reference microphone OFF e Unaided CUSTOM e Probe microphone over the bad ear tube jutting just slightly forward of pinna e Loudspeaker at 90 12 inches from bad ear Aided Real Ear response on good
84. Composite signal and the Digital Speech signal can be used to see how much the aid lowers its gain when subjected to a noisy signal This is a test of the noise suppression technology on the hearing aid 1 Enter the Real ear Insertion Gain or Real ear SPL screen set up the patient for real ear measurements and level the sound field speaker 2 Use F2 to select REAR 2 Press F2 Use v a to select REAR 2 Press gt to complete the selection and close the menu 3 Use F5 to select Digital Speech 4 Use v a to set the source amplitude to 65 dB SPL 160 FONIX 7000 Hearing Aid Analyzer O u OP Press START to measure the frequency response of the hearing aid Press STOP when the measurement has stabilized Use F2 to select the REAR 3 Use F5 to select Composite Use v a to set the source amplitude to 65 dB SPL Press START to start the measurement After the measurement has sta bilized press STOP to stop the measurement Figure 6 5 4 illustrates an example of a digital hearing aid with noise suppresion Curve 2 shows the response of the aid to the Digital Speech curve and Curve 3 shows the response of the aid to the Composite signal lt lt 5 tax 4 3 Figure 6 5 4 Testing noise suppression of a digital hearing aid REAR 2 was tested using Digital Speech REAR 3 was tested using the Composite Signal 6 6 Directional Hearing Aids The directional advantage provided by a hearing aid c
85. FONIX 7000 Hearing Aid Test System Operator s Manual Version 1 51 FRYE ELECTRONICS INC P O Box 23391 Tigard OR 97281 3391 USA 503 620 2722 800 547 8209 Fax 503 639 0128 FRYE www frye com e mail sales frye com 2006 Frye Electronics Inc All rights reserved Oct 23 2006 Contents Chapter 1 Introduction amp Setup LT AHISLONY AERA EET sta EE shnd es TE eden ahha nk von dee aa taciae at 1 1 2 Basic Test FUNCIONS aei sena anactiete chili dia eels hacen pended eat S A iets 2 LI Options 322 a E A hes ieee ek ate GaN A AGS otha BERS a ee a ees 2 TH ACCOSSOLIES once ccetee ee Soa sss in REEE cece tas IEE EET EEEE TAE E ERSTE ETER S KGN 4 1A 1 Standard Accessories cece cece cece ee ee cece eee e eee e teen nee e eects ten tees aa 4 T42Real Ear Accessories lt 5 sciiseieae ahmed Sandia O A oa AAA EEE OA rA EREE EAA 6 14 3 Optional Accessories 0 cece cece cee a aaa a a aa a aaaea aana Ta Ee EEE ES 8 1 5 Layout Controls and Safety 0 cece ccc cece eee ee rsrsr eee ee ence eee eee tebe en eee Ee anaes 11l 1 5 1 Front Panel Layouts eenen dai EAE E ri PENNE OEE AATE E PENERE ll 1 5 2 Rear Panel Layout 222 023 wiv cc 4 pete cisions da bb bene E A 4 sR Eee Bane desetles 13 5 3 MSalet yn ooed cos eee PEENE B24 bo bet cot iss ad din oie Mohs eid add ot ok Ae 14 IRETI UT SEEE A ET A T E ANET tele 16 1 6 1 Unpacking the FONIX 7000 ccc cece cece cece eee e ee
86. Fully Automatic Mode 00 c cece cece eee cee e teen ee ee nee eenneennn teens 93 3 8 4 Testing in Semi Automatic Mode ccc cece cece cee eee e eee e nee nent en ne enen teens 93 3 9 Complete List of Menu Items 0 cece cece cence eee eee cence eee e eect eee eee eee eeeeeeeees 94 Chapter 4 Advanced Coupler Tests 4 1 Enhanced DSP oui Er Ea E N Lesa aide ds son ESN TAANE ELE TAAAK EEA AAEE AAAS 97 EEF Digital Processing Delay 22 2 hele rce dled deer n E EAE A E A 97 Hel Signal PhasErnreoni tr a a nies eye a AO os ann EEA O a E FEAR 98 TTS Proceduri orrera cite cas EE AE EE A MUNN Aso 8484 Meme Ee 99 4 2 Battery Current Test ocorran a aaa E aa A e aia eA EEE A EEE EANN ue date 100 4 2 1 Static Test Estimated Battery Life 0 c cece cece eee e eee e eee nee e nets teen ene 101 W212 MAL PLO eiie a E sia EE eae a Red EEE ATE edi Neal EAAS TERET 102 123 MA AMP ooo sedi rier bd 059844 Geen EEE KAE OE EWE ONO EEEAG EEE RAR Teed 102 43 Coupler O vice on eee eettetann adda esa aody ua a ideas sll a eA aieinanddes pel aandabensetian 3 103 WA Attack A Reeser acces AE APEE howl cose anak eo haa EE BiG Wace sea ree I aeae Ea 104 Chapter 5 Automated Test Sequences BL ANSIS3 223 orto eee ventas EEE 0 4 a duiere EAEE bacon twee ected eee esol 107 1 1 Leveling for ANSl goc 0 cc cick aiaa a eetas Sie baa bb cocece weds eed Sepeeaa eb BERLE eases Sete 108 5 1 2 Setting up the hearing aid for ANSI cc
87. L screen Press MENU to open the local menu Select Reference Mic under Measurements with v a Choose Off with gt Press EXIT to close the local menu Orr E R O A ES Level the sound field speaker as usual even though the reference micro phone is disabled for measurements it will still be used for leveling Real Ear Measurements 163 7 Test as usual With the reference microphone disabled it is even more criti cal than usual that the patient not move after leveling and that the sound field be undisturbed during testing 6 8 Visible Speech The Visible Speech screen shown in Figure 6 8 is a special screen used for per forming real ear measurements with live speech or other external source types The following features are displayed upon the Visible Speech screen before the test has started Visible Speech was designed to demonstrate the real time response of the hear ing aid to the speech signal the average response of the aid over the time of the test and the minimum and maximum amplitudes of each frequency These measurements can be compared to the patient s thresholds uncomfortable lev els real ear target s and the long term average speech spectrum When first entering the Visible Speech screen Figure 6 8 it has the following characteristics 1 Shaded areas below and above the patient s patient s threshold and uncom fortable values respectively The non shaded area in the center of the
88. REUR The output of an aid in dB SPL A miniature microphone with a thin flexible tube that is inserted into an ear canal to measure sound A burst of ten pure tones corresponding to standard audometric frequencies The entire signal lasts for less than two seconds A testing tone consisting of only one frequency A special test procedure using a probe microphone and a special instrument capable of measuring sound levels inside an ear canal The ability to view instantly the results of hearing aid tests Real Ear to Coupler Difference Measurement of the difference in decibels between the output of a hearing aid found with a probe microphone in the ear canal and the output of the aid found in a 2 cc coupler With the QUIK PROBE Option the microphone placed above the ear which provides a reference measurement that is compared to that of the probe microphone placed in the ear canal The location in a test chamber where the microphone of a hearing aid must be placed for accurate testing In the 7000 it is the small circle in the center of the test chamber Real Ear Aided Response See Aided Response Real Ear to Dial Difference This is the difference of the output of an audiometer in dB HL and the measured dB SPL value measured with a probe microphone in the ear Real Ear Insertion gain Response See Insertion Gain The tendency of an acoustic system to reinforce sounds of a certain frequency the frequency
89. SPL measurements When using pure tones set Noise Red Tone to OFF in the local menu of the real ear measurement screen to increase the test speed The pure tone SHORT signal is recommended when testing output levels at 90 dB SPL 1 Push MENU from the real ear measurement screen to enter the local menu 2 Use v a to select OUTPUT LIMIT under Measurements 3 Use lt gt to choose the desired limit 4 Return to the measurement screen by pressing EXIT 132 FONIX 7000 Hearing Aid Analyzer SANITATION NOTICE DO NOT REUSE PROBE TUBES Use a new probe tube for each ear to prevent the possible spread of infection Sterilization of probe tubes is not pos sible and germicidal solutions can leave a residue inside the tubing which can result in errors Do not cut off any portion of the tube Real Ear Measurements 133 Press F5 to select the Composite signal as the source type 4 Press START to start a measurement Insert the probe tube carefully looking at the composite measurement At some point there will be a large dip below the 0 dB level at 6 kHz caused by the standing wave inside the ear Keep inserting the probe tube until that dip goes away and the unaided response is above 0 dB gain between 6 kHz and 8 kHz See Figure 6 2 3B 6 Press EXIT to return to the Real Ear Navigation screen Hints To help keep the probe tube in place position the tube so that it runs through the tragal notch
90. TH Hiddle Target RIET HHHH High Target ua Lec Upper Comfort Leal Liei Dpto Dear pic KIDINI Lite LTS level assas Hid LTES level ihihih High LTRS leal A E iki 2 Pred START L glee mpacurceene lei otim util SOF ir preired FE T Figure 6 8 3 Completed Visible Speech test 6 8 4 Measuring multiple envelopes The clinician can measure up to three different Visible Speech envelopes For example it may be beneficial to perform measurements of the different pro grams on the hearing aid Another example of the usefulness of multiple measurements is when using the voice of the spouse of the patient Have the spouse stand a few feet from the patient when measuring Visible Speech Envelope 1 Then use F2 to select Visible Speech Envelope 2 Press F2 Use v a to select the desired envelope Press gt to complete the selection and close the pop up menu Repeat the test with the spouse standing across the room from the patient A comparison of the two envelopes can demonstrate to the patient and the spouse how close they need to be to each other in order for speech to be easily audible When multiple envelopes have been measured the selected envelope measure ments are brighter more visible than measurements of the other envelopes To view a different Visible Speech envelope use F2 to select it or use F3 to tem porarily turn off the display of the other envelopes Real Ear Measurements 167 6 9 CROS BI
91. The 7000 test system can be ordered with the Real Ear Option so that tests can be done on the hearing aid while it is in the client s ear These measurements are also commonly called probe measurements because they are performed Introduction and Setup 3 with a probe microphone Using real ear measurements makes it possible to individualize the fitting of a hearing aid since a coupler measurement can sel dom tell the operator exactly how what sound is received by the client Many factors affect the sound on its way to the ear drum When measuring with a probe microphone you will know what is happening in the real ear ANSI Option The ANSI Option gives the user access to the ANSI 03 ANSI 96 ANSI 87 and ANSI 92 test sequences These perform measurements according to the ANSI 3 22 2003 ANSI S3 22 1996 ANSI S3 22 1987 and ANSI S3 42 1992 stan dards respectively This option also includes the Telewand which is used for performing ANSI 96 telecoil measurements IEC Option The IEC Option gives the user access to the IEC test sequence which performs measurements in accordance with the IEC 118 7 the performance part of the IEC standard OES Option The Occluded Ear Simulator OES Option includes the MZ 1 MZ 2 and MZ 3 couplers and corresponding correction factors meant to simulate the results of a real ear simulator Zwislocki coupler when simulating occluded ear measure ments in the sound chamber The results
92. To measure a CIC hearing aid 1 Attach the CIC coupler to the CIC aid just as you would attach an HA 1 coupler to the aid and set the hearing aid up for testing as shown in Section 3 3 2 Press MENU in the Coupler screen Highlight Coupler Type under Measurement Settings with v a Select CIC with lt gt Press EXIT Select the desired source type with F5 Press F5 Use v a to select the desired source type Press gt to complete the selection and close the pop up menu Oe Let seek aby 7 Select the desired source amplitude with v a Basic Sound Chamber Tests 89 8 Press START to perform the measurement You should see CIC appear in the Curve Characteristics box in the Cor column of the selected curve If you are using the FAST COMPOSITE or DIG SPEECH signal press STOP to end the measurement once it has stabilized Figure 3 6 shows the difference between a CIC hearing aid tested with an HA 1 coupler and the same aid tested with a CIC coupler and correction factors E fib lL ad E IT i s I y k H i f ii OF g orori Coapite AWS Wsighbed Dhabi Levi Deed Projected Holis Reuetians AE source G8 oe Uie LPM to de ee baal bawel lie WITSE red H i imple Praha ERT E 10 Pun bari ai selected carve Freri MERU for bacal morn Fz Figure 3 6 CURVE 2 uses CIC coupler correction factors CURVE 1 uses 2 cc HA 1 coupler 3 7 Occluded Ear Simulator Opti
93. WEIGHTED GAIN WEIGHTED POWER WHITE NOISE WINCHAP A pure tone with slight but rapid frequency variations A measure of the amplification gain of an aid using an input signal source that has a spectral shape similar to that of the long term average of speech The measurement of amplitude in SPL of the output of an aid using an input signal source that has a spectral shape similar to that of the long term average of speech A signal composed of all frequencies which vary randomly in phase each frequency having equal long term energy levels Windows Computer Hearing Aid Program used for storing hearing aid tests and client information on a personal computer FONIX 7000 Hearing Aid Analyzer 205 Index A Adaptive AGC 36 AGC frequency 116 AIDED DATA 153 Aided response 148 Aid type 95 ANSI 84 158 ANSI 03 107 108 110 ANSI 92 117 ANSI Option 3 Arrow keys 12 28 Attack amp Release test 104 Attack Window 116 Audiogram 135 Automatic 151 Automatic testing 91 Average 73 Average unaided response 147 Avg Freqs 95 Azimuth 128 Battery 100 Battery current drain 77 Battery Meas 96 115 122 125 Battery Size 96 115 122 125 Battery substitution pills 5 9 Bias signals 85 Bias tone 95 159 BICROS 66 wireless 67 wiretype 68 Body Aids 64 135 BTE 62 Button operation 23 C Calibration 177 Calibrator 9 Chirp 40 CIC 88 115 CIC coupler 8 9 Cleaning 19 Composite 37 69 84
94. able 1 If Aided 2 is composite subtract 10 7 dB from each frequency If Aided 2 is Speech Weighted tone add 2 1 dB to each frequency If Aided 2 is Speech Weighted subtract the Speech Weighting in Table 2 The complete formula is then Target SPL Target IG CRV2 source AVG REUR If Aided2 is composite 10 7 dB Speech Weighting If Aided2 is speech tone Speech Weighting e To convert the HTL and UCL from HL to SPL Add the corrections in Table 3 e To predict UCL s HL given the HTL HL Use Table 4 to convert from HTL to UCL 194 FONIX 7000 Hearing Aid Analyzer TABLE 1 Average Real Ear Unaided Response REUR FREQ GAIN Hz dB TABLE 2 Speech Weighting FREQ Hz 2100 2200 2300 2400 2500 2600 2700 2800 2900 3000 3100 3200 3300 3400 3500 3600 3700 3800 3900 4000 GAIN dB 13 9 14 7 15 1 15 0 15 1 15 0 14 6 14 1 13 6 13 7 13 8 14 1 14 5 14 8 14 9 14 7 14 3 13 9 13 5 13 1 FREQ Hz 4100 4200 4300 4400 4500 4600 4700 4800 4900 5000 5100 5200 5300 5400 5500 5600 5700 5800 5900 6000 GAIN FREQ dB Hz 12 7 12 4 12 2 12 0 11 9 11 7 11 6 11 2 10 7 10 3 9 9 9 5 9 2 8 9 8 7 8 5 8 3 8 2 8 0 7 8 6100 6200 6300 6400 6500 6600 6700 6800 6900 7000 7100 7200 7300 7400 7500 7600 7700 7800 7900 8000 GAIN dB Probe SPL Mode Description 195 TABLE 3 HL to real ear SPL or SPL to HL conversion
95. able for performing an RECD measurement with the 7000 Test System 1 5 Layout Controls and Safety This section describes the basic layout of the front and rear panel of the 7000 test system and special information pertaining to safety regulations 1 5 1 Front Panel Layout The front panel of the 7000 test system consists of 8 function keys 4 arrow keys and 9 other keys with varying operations Together all of these keys are used to control all the operations of the 7000 test system A wide internal ther mal printer is located to the right of the front panel See Figure 1 5 1 F1 F2 F3 F4 F5 F6 F7 F8 MENU EXIT LEVEL STOP HELP FEED START PRINT q D POWER STANDBY T y m lt M m FONIX 7000 Hearing Aid Test System Figure 1 5 1 Front panel FUNCTION KEYS The top row of buttons on the 7000 front panel consists of function keys labeled F1 through F8 The function of these keys change from screen to screen according to the need of the screen There are three basic uses of the function keys 12 FONIX 7000 Hearing Aid Analyzer e To navigate from screen to screen e To toggle a selection To pop up up a selection menu For a more complete description of the operation of the function keys see Section 2 1 1 RESET HELP MENU EXIT LEVEL FEED PRINT STOP START ARROW KEYS LEDs Resets the analyzer and returns you to the openi
96. ace the microphone on the left side of the sound chamber with the micro phone grill over the reference point Figure 3 2 1 Close and latch the sound chamber lid Warning Leveling is valid only when the microphone position is not changed after leveling Each significant change in microphone location requires new leveling 3 Press F1 to enter the Coupler screen 4 Press LEVEL to start the leveling sequence The system responds by pre senting a complex composite signal consisting of tones from 100 to 8000 Hz It measures the signal and stores correction factors so that the sound field is flat for testing 5 Look at the display After a few seconds the video monitor should display a Leveled message under the Curve Characteristics box If the 7000 doesn t level it could be an indication that your microphone needs to be calibrated or replaced 58 FONIX 7000 Hearing Aid Analyzer Figure 3 2 1 Leveling the sound chamber Note See Section 5 1 1 for the ANSI standardized leveling procedures 3 2 2 Removing the leveling of the sound chamber In some instances you may want to look at the response of the sound chamber without the benefit of leveling In order to do this you will need to remove the leveling of the sound chamber To do this 1 Disconnect the microphone or the sound chamber 2 Push the LEVEL button The leveling will be removed If you don t save this new unleveled status the analyzer will
97. acy in a testing system It usually is expressed in units and or percent See Unaided Response A computer short cut of the FOURIER TRANSFORM method for determining the frequency content of a signal Same as UNWEIGHTED referring to a signal that has equal amplitude at every frequency A mathematical procedure that changes time information into frequency information The number of vibrations or cycles per second of a periodic wave The unit of measurement is Hertz Hz A measure of the output or gain of a device across a range of frequencies of the input signal The lowest frequency in a harmonic complex tone such as the FONIX Composite signal The fundamental frequency determines the pitch of a tone A brand name for a modeling clay like substance used to attach and seal hearing aids to couplers The amplification or increase in sound power in a hearing aid In testing it results from subtracting the level of the input from the level of the output of the aid FONIX 7000 Hearing Aid Analyzer GIFROC GRAPH HAIC HARMONICS HARMONIC DISTORTION HFA HEAD BAFFLE EFFECT HL Hz ICRA TEC INSERT EARPHONE INSERTION GAIN RESPONSE IN SITU The inverse of CORFIG GIFROC is the transformation that when added to a coupler response will give the estimated insertion gain response A grid of lines with the vertical lines representing one set of information a
98. aes 76 3 4 9 Battery Current Draing rnei ies ceed oe he oa sa he edie Le Ae ong ea hotles ead oe oda ea 77 SAO Wel COI eis ee asad fee ALE a Bo alert eee clan AOE E aN lute Re Cann ane OER bleh eee d traatet 78 3 4 11 Measuring directionality 0 c cece cece ee eee E AERE eee e ee eee SANEA OESE REANA 80 3 5 Digital hearing aidsiin o tesco dae 8 oa Ph eee oe dette do Tee a Rae ETEA de oa oo EREE 84 3 5 1 Using Digital Speech 6 ccc cee cere a e nn eee ee eben een eet bn beeen teens 84 3 5 2 Changing the Speech Shape 0 cece cece cece eee eee ee eee ne eeen eee eeneeenn teens 84 3 5 3 Testing with Bias Signals sisena terri E 005 ctl REEE E ia eaaindoeacGdeeaier et oes eit 85 3 5 4 Checking Noise SUPpression oriniai cece eee eee ee eee EEA ATENE ne eeen tenes 86 3 5 5 Understanding Terminology 0c ccc cece cece eee ee eee e eee ene ee ne tennetenn teens 88 3 6 CIC Feature siisi s ceuk de techn ne a oe a vin ah ney PUSS OM aid ona E AEE TOR Aa es east enn seae E 88 3 7 Occluded Ear Simulator Option 0 0 cece cece cee reece eee n ee ee ene eet n EE enn Ee EE 89 3 8 Automatic Testing Loading amp Saving GroupS 0c ccc cece cence eee e eect nee e ene e een eens 91 3 8 1 Setting up a test SEQUENCE 6 cece cee cece eee cee cnet e cence nent eee en eee eeeeneeneeees 92 3 8 2 Loading a Saved Test Sequence cece cect eee ee teen eee e eee nent teen beeen teens 93 3 8 3 Testing in
99. al Owner Comments _ Figure 2 4 2 Label with printed result 44 FONIX 7000 Hearing Aid Analyzer If you want to include a label on all printouts by default Press MENU from the Opening screen to enter the Setup menu Use v a to select Print Label Use gt to select ON Press MENU to close the Setup menu Press F8 to save the user defaults This will also save all the other selec tions in the Setup menu ao FW N e 6 Press EXIT to return to the Opening screen 2 4 3 Using the internal printer The internal printer of the 7000 test system is straight forward to use Make sure the internal printer is selected by following the instructions in the section above Press PRINT to print any displayed screen Press the FEED button to feed the thermal paper through the printer without printing General Information The following is useful information e Raise Head Up lever to the up position when paper is not loaded or when the internal printer is not in use for extended periods of time e Frequently inspect the printer for any residue or foreign matter and clean as required Paper residue or foreign matter may shorten the life of the thermal printer head or platen e The 7000 printer mechanism is equipped with a paper back tension device This feature is used to eliminate paper migration from side to side If paper migrates too far to one side the edge or the paper will kr
100. al Speech ICRA CRV1 Digital Speech ANSI CRV2 and the Composite signal CRV3 3 5 3 Testing with Bias Signals You can add a pure tone bias signal to the Digital Speech signal creating a con tinuous signal at the frequency of your choice This will allow you to see how the aid reacts to the presence of noise at different frequencies To add a bias sig nal 1 Select the DIG SPEECH signal with F5 in the Coupler screen 2 Press MENU to enter the local menu 3 Use v a to select Bias Tone under Source Settings Use the START key to skip ahead sections if necessary 4 Use lt gt to select the bias amplitude Press EXIT to return to the Coupler screen 6 Press START to start the frequency response measurement The Digital Speech signal will include a bias signal at the amplitude you specified in Step 4 86 FONIX 7000 Hearing Aid Analyzer po TIFE FOGG AMALTZER Durer Dh ite i Geute i Cor AA nore Caepeech AT hee igre Chambers Love bed Bise lore OFF Projected Mojde Retest bane dE Source GS cA Uie LPO o ie ee tapt Ima We Le R ight i lasl Dim bore Priit ATi i P at ot il lected iure Prien basil ioe Figure 3 5 3 Using the bias signal with Digital Speech CRV 1 3 have bias signals at 500 Hz 1000 Hz and 4000 Hz respectively CRV 4 was performed with Digital Speech and no bias signal 7 Use lt gt to change the frequency of the bias signal The current
101. al details about this test e Choose between showing test results in SPL Output and Gain in the local menu Use MENU to open the local menu the arrow keys to adjust the selections and EXIT or MENU again to close the local menu F2 sets the aid type This changes the length of time each stimulus is presented before the measurement is taken Suitable default delay times are set when the aid type is selected You can make further adjustments to the delay settings in the local menu See Section 2 3 1 3 for details e The settings used for the test displayed on the graph are shown above the data results on the right side of the screen The settings that will be used when START is pressed are shown below the data under Current Settings 4 4 Attack amp Release The Attack amp Release test demonstrates how the hearing aid reacts to noise at different intensity levels The test works by presenting a loud soft loud soft stimuli sequence to the aid The first loud soft tones are done to prepare the analyzer and the hearing aid for the test The second loud soft tones are used for the actual measurements The loud stimulus demonstrates the hearing aid s attack time That is how the hearing aid reacts to the test stimulus going from a soft level to a loud level The last soft stimulus demonstrates the hearing aid s release time That is how the hearing aid reacts to the test stimulus going from a loud level to a soft level
102. al hearing aid any differently than you would test a normal analog hearing aid Just choose Digital Speech as your testing signal using the F5 function key in one of the real ear testing screens 158 FONIX 7000 Hearing Aid Analyzer 6 5 2 Choosing a speech weighting By default the Digital Speech and Composite signal uses the ANSI S3 42 speech weighting Some clinicians however prefer to test using the ICRA speech weighting which was used in the development of some digital hearing aids The ICRA weighting available on the 7000 analyzer is based on the ICRA CD track 1 unmodulated moderate male weighted artificial speech devel oped by the International Collegium of Rehabilitative Audiologists ICRA See Figure 6 5 2 for a comparison of an aid being tested with the ANSI and the ICRA speech weightings To change the speech weighting 1 Press MENU from a real ear measurement screen Use v a to select Composite Filter under Source Use lt gt to choose ANSI or ICRA Press EXIT to return to the real ear measurement screen Any Digital Speech or Composite signal will use the new selected speech weighting Ae wo N i 25 5 1 kHz 2 4 8 Figure 6 5 2 A comparison of an aid being tested with Digital Speech using the ICRA CRV 3 and the ANSI S3 42 CRV 2 speech weightings 6 5 3 Testing the digital filters It is possible to add a bias tone to the Digital Speech signal in order to see how the aid responds in
103. ally stop The default setting for the output limit is 120 dB SPL In the real ear measure ment menu you can change this limit to any value between 90 dB SPL to 140 dB SPL in 5 dB steps Be aware that extra care is necessary with any output that may exceed 132 dB SPL Also keep in mind that the sound pressure level at the eardrum can be higher than that measured at the mid ear canal position especially at high fre quencies For this reason extreme caution is advised when performing real ear measurements with a source level of 90 dB SPL To change the output limit 1 Press MENU to enter the real ear measurement menu 2 Press v a to select Output Limit under Measurements 3 Use lt gt to choose the desired limit 4 Press EXIT to return to the real ear measurement screen 6 4 13 Measuring the occlusion effect You can use the Insertion Gain screen in order to measure the occlusion effect of a hearing aid By analyzing the spectrum of your client s own voice you can judge whether the occlusion effect will make the hearing aid uncomfortable and you can measure an improvement lessening of the occlusion effect after adjusting the vent opening To measure the occlusion effect 1 Enter the Real Ear Navigation screen by pressing F2 from the Opening screen 2 Follow the instructions in Section 6 2 3 to insert the probe tube into the cli ent s ear You do not have to level the sound field speaker for thi
104. amplitude 41 chirp 40 display 56 shape 84 standard 40 type 40 Composite Filter 84 95 Composite Type 95 Computer connection 52 Connections 17 COPY EAR 136 Couplers 59 6 cc 8 CIC 8 185 ear level adapter 4 HA 1 4 HA 2 59 MZ 8 90 open ear 9 63 Coupler I O 103 Coupler screen 55 local menu 94 Coupler type 95 Crest factor 40 CROS wireless 66 wiretype 68 CROS BICROS 167 Curve characteristics box 49 Curve label 94 D Data 51 152 Data Graph 94 153 Date 29 Default settings 29 Delay times 35 Delete 72 154 Digital filters 158 Digital hearing aids 114 157 coupler 84 Digital Processing Delay 97 Digital Speech 37 69 84 85 157 Display 94 154 DSL earphone package 11 DSP enhanced 97 Dummy Microphone 5 108 206 FONIX 7000 Hearing Aid Analyzer E Ear level adapter 4 59 Ear hook 7 129 Enhanced DSP 97 Equiv Noise Test 115 122 126 EXIT 12 28 Eyeglass 65 F Factory 22 FAST 33 69 FEED 12 28 Fitting formula tables 189 Fitting rules 150 FM kit 10 Frequency 151 Frequency sweep 69 Front panel layout 11 Fully automatic 151 Fully automatic mode 93 Function keys 11 23 G Gain 147 Glossary 197 GRAPH 153 Graph scale 94 Group delay 97 H HA 1 4 59 HA 2 4 59 Harmonic distortion 36 74 Head baffle effect 168 Headband 8 Hearing aid setup 58 HELP 12 History 1 HTL 136 141 T O Meas 116 T O Meas Delay 123 125 YO Start 116 I O Start Delay 123 125 I O Test 1
105. an be easily measured with real ear measurements This section describes a method of measuring directionality using the Real ear Insertion Gain screen 6 6 1 Using the insertion gain technique The Real ear Insertion Gain screen is ideal for performing real ear measure ments of hearing aid directionality To test directionality 1 Set up the patient for real ear measurements by inserting the probe micro phone and hearing aid Place the sound field speaker behind the patient at 180 or 135 azimuth Point the reference microphone of the probe microphone set towards the sound field speaker Enter the Real ear Insertion Gain screen Real Ear Measurements 161 4 Press LEVEL to level the sound field speaker 5 Use F2 to select REUG 1 Press F2 to open the pop up selection menu Use v a to select REUG 1 Press gt to complete the selection and close the menu 6 Use F5 to set the source type to DIG SPEECH 7 Use v a to set the source amplitude to 50 dB SPL 8 Press START to start the frequency response measurement When the mea surement has stabilized press STOP This is the reverse measurement curve 9 Use F2 to select REAG 2 10 Use F5 to set the source type to DIG SPEECH 11 Use v a to set the source amplitude to 50 dB SPL a oa a Source Hgh ART bie igrebed Soured Field Leva bed Bise Tore GFF Prejected Hoilis Peestions di teference Hic On Sencha Lo Uri de
106. an be mounted to a wall or desktop The four piece arm swivels and extends along five different dimensions to allow precise placement and aiming of the loud speaker Spring tension and friction keep the loudspeaker exactly where you put it Introduction and Setup Monitor Headset Plugs into the remote module and allows the user to listen to the signal being measured by the probe micro phone Model of headset may differ from one shown Wedge style Ear Hook Standard Size Holds probe and refer ence microphone during real ear test ing Probe Tubes Used for performing real ear measure ments Probe tubes are not reusable FONIX 7000 Hearing Aid Analyzer 1 4 3 Optional Accessories Infant Child Headband Includes infant child and adult head bands six bendable earhooks and two sets of animal ears 6 cc Coupler Enables checking the response of stan dard audiometer headphones It is designed around the NBS 9A coupler specifications MZ Couplers MZ 3 MZ 2 and MZ 1 couplers are supplied with the OES Option CIC Coupler Non standard 0 4 cc coupler used for realistic testing of CIC hearing aids This coupler is always used in con junction with the CIC software correc tion factors Introduction and Setup 9 Open Ear Coupler Non standard coupler used for realistic testing of open ear hearing aids 5 battery pill Provides battery current measurements for many CIC hearing a
107. asured but turned off Curve is partially off the bottom of the graph Curve is partially off the top of the graph Curve is on but is out of view above the graph Curve is on but is out of view below the graph Curve is partially off the graph in both directions 2 5 2 Viewing numerical data You can display the numerical data of the response curves made in the Coupler screen and the real ear measurement screens To display numerical data Press MENU from the Coupler screen or real ear measurement screen Select Data Graph using v a Use lt gt to select DATA Press EXIT to return to the measurement screen ao FW N e Use F2 to select the curve that you want to show See Figure 2 5 2 for an example of the data display of a composite curve Unlike the other measurement screens the Insertion Gain screen offers the following selections AIDED DATA and IG DATA A selection of AIDED DATA will display the data from the aided curves that are normally displayed on the lower graph of the screen A selection of IG DATA will display the data from the insertion gain curves that are normally displayed on the upper graph of the screen FONIX 7000 Hearing Aid Analyzer Coupler Left 1 Freq SPL Freq Hz dB Hz FONIY TYPE 7000 ANALYZER Coupler Left Ear Curve Characteristics Cury lt Source gt RMS Cor NR Name Type Trans Amp Dut HEL cup EL CHP L3 CFP CL4 CFP CLS CFP CLE CFP F F P P
108. ble to successfully level the sound field speaker in the past the most likely problem is the reference microphone needs calibration or is damaged although sound field speakers have also been known to go bad Sound field leveling however is more prone to user error than sound chamber leveling Make sure the sound field speaker isn t pointed at a wall or other sur face that may cause the sound field to bounce and interfere with the leveling process and measurements The client should be 12 15 inches from the speak er try moving him closer and see if that helps For troubleshooting purposes try leveling the sound field speaker by holding the microphone 6 inches from the speaker If the sound field levels with this technique then you probably have a positioning problem instead of a hardware problem This technique should NOT be used for leveling for actual real ear measurements Contact the factory or your local FONIX distributor if you continue to have prob lems with leveling Chapter 3 55 Basic Sound Chamber Tests In the Coupler screen you can view measurement curves in dB SPL or dB Gain and run them with Composite Digital Speech or pure tone signals You can dis play up to 10 curves on the Coupler screen at the same time From the Opening screen of the 7000 test system enter the Coupler screen by pressing F1 The Coupler Multicurve screen can be set as the screen that appears when the 7000 test system is powered o
109. c selection is used for the HA 1 and HA 2 coupler The MZ selection is used for the MZ couplers Press MENU and use the arrow keys to make any desired changes to the menu items See Section 5 4 4 for more details Press EXIT to close the local menu Press START to start the test sequence The instrument will run a measure ment and then pause Turn the gain of the aid down to the reference test position Match the target value within 1 dB 10 Press START to complete the test sequence 11 Press PRINT to print test results 124 FONIX 7000 Hearing Aid Analyzer 5 4 2 Viewing JIS Results ny FINED TWE ACD WL YEE BIS 2000 aple foo Left Der A ri 5 f a E i SE OSPLSOG BHs 127 308 teapore Limit 340 abi fs i S et bidi 125 8 E 300 W oy arene ly fey me Site Lae FZ zia PE y k APY po Teta Hirie Ditert iat ri Sarit ro a I a YOA ae Tuan dira S0 ii Pa ta min p w Fah a A i foreree Thri Gain Ol Di HE im ae al Riri ee LoT i he t ehir aE ha Battery 16 He ey mak T im Hois 2h Sa 1i finir Lil m Ta ow z w S E has r hy p Aik L 1 i Fe liiin T iad E Pi at 1600 Me 7 f ibis He S pr mn 7 z 1 Gur LEVELE Bit Completed Frese START 1o run berl again Fi Fe FI FI re Sd SC wS Fi FE FIFE Lets Esr feat E H 2 ee Curen K L St Bic Tga IT el Esr reg Crap lr Aot Loren IHH Figure 5 4 2 See Figure 5 4
110. c cece cece eee e cece eee ee eee ee eeeeee eee eeaaee 109 5 1 3 Setting up the analyzer for ANSI 0 0 0 cece cece eee e eee e cece n ene e eee e ee eeneen eee teaaae 110 5 144 Running an ANSI 96 or an ANSI 03 Test 00 cece cece eee ce eee eee tee ence eee eeeeeeeeeaee 110 5 1 5 Running an ANSI 87 Test 0 a cece cee cece cee eee e een cee EE ee een ANE 112 5 1 6 Viewing ANSI Results nnnneunnnnenneneenseerenerrsrerererrererrsrrresererrerrsessere 112 5 17 Testing Digital Hearing Aids 00 cece ccc cee cee teen eee eee eect tenes een eet en ee es 114 5 1 8 Viewing ANSI measurements in the Coupler screen ee cee eee cece e eee ee eee neeees 114 5 1 9 Explaining the Menu Settings 00 cece cece e ee eee eee cece ee eee ee eee een eee en ee es 115 5 2 ANSIS3 42 1992 ANSI 92 reer ed Fe baeseeee cag aw been dee dans E ceee bed oad unae REN 117 5 2 1 Understanding ANSI 92 enin a E a A aa Sa ES 117 5 22 RUNNING ANSI 925 e a Ea E E E shag E EE EES 117 5 2 3 Viewing ANSI 92 Results 0 0 cece cect eee eee eee e eee cette nett neste eee eneeee 118 5 24 Viewing ANSI measurements in the Coupler screen cece cence eee e ee eee eee e eee eaeee 119 5 2 5 Explaining the Menu SettingS 00 ccc ms pored aan E eee reece ene een teen SG 120 58 IEC Aare gs E E eNO OOS REL NG AS UG EE BO BS CORE arts 25 ced 120 5 3 Setting uprl EC anaren area ieee ed cei dt ee dena cece
111. ce 60 dBSPL Use UP DOWN to select test level Use M1750E and HA coupler Press START to run test at selected curve Press MENU for local menu Fi F2 F5 F F7 Fe Left Ear 1 Composite OFF OFF Prev 2003 05 29 Select Cru Select On Off Curvets Src Select Auto Test Toggle derids24 Figure 2 3 2 2 Example of IM distortion 2 3 2 3 Composite filter There are two main types of composite filters also known as speech weight ing ICRA and ANSI They differ in the speech spectrum they use The ANSI filter taken from the ANSI S3 42 standard rolls off the high frequen cies at a rate of 6 dB per octave starting with a 3 dB drop at 900 Hz The ICRA filter uses the ICRA speech spectrum developed by the International Collegium of Rehabilitative Audiology The ICRA spectrum is based on the Long Term Average Speech Spectrum LTASS and rolls off the high frequencies more rap idly than the ANSI spectrum Figure 2 3 2 3 shows a comparison of the spectra In general we recommend using the ANSI speech weighting for Composite and Digital Speech measurements 40 FONIX 7000 Hearing Aid Analyzer FONIX TYPE 7000 ANALYZER Coupler Left Ear Curve Characteristics Cury lt Source gt RMS Cor NR Name Type Trans Amp Out IEE CUP Chamb 7O 70 1 4x CLe CWP Chamb FO 70 1 48 CLS CFP Chamb CL4 CFP Chamb CL5 CFP Chamb CLE CFP Chamb CL CFP Chamb CLE CFP Chamb CLI CFP Chamb CL CFP Chamb
112. ch screen Insert the probe microphone into the patient s ear as described in Section 6 2 3 The reference microphone is not used in this measurement It can be placed on the earhook as normal or left hanging behind the patient s back Insert the hearing aid into the ear being careful not to move the probe tube Situate the patient in front of the person who will be providing the live speech stimulus or the loudspeaker providing the external signal Have the person start talking or start the external signal It is useful to have a handheld sound level to monitor the input level of the signal at the patient s ear Press START on the 7000 analyzer This will start the Visible Speech mea surement Real Ear Measurements 165 6 8 2 Viewing the Real time Visible Speech Display During the Visible Speech test the analyzer displays four changing measure ment curves Real time measurement curve showing the immediate response of the hearing aid Average frequency response of the hearing aid over the time of the test Maximum amplitude of the response per frequency Minimum amplitude of the response per frequency These measurements together give the clinician both the real time response of the hearing aid and information about its response over the time of the test Press STOP when the average response curve has stabilized This may take 30 60 seconds 6 8 3 Viewing Completed Test Results When the Visible Speech measure
113. curve measured at the reference frequency 5 3 4 Viewing IEC measurements in the Coupler screen It s possible to copy IEC response curves to the Coupler screen where they can be compared to other response curves To do this Run the IEC test sequence Press F6 Use a to select Store Crvs Coup if necessary Ae O N e Press gt to store the curves and close the menu The following is a list of where the curves are stored in the Coupler screen Any previous measure ments stored in those curve locations will be overwritten e Full on Gain CRV 5 e Response CRV 6 e OSPL9O0 CRV 7 5 Press EXIT and F1 to enter the Coupler screen and view the IEC response curves 5 3 5 Understanding the Menu Settings The following menu settings are available in the local menu of the IEC screen Measurement Settings e Noise Red Tone The amount of noise reduction used in the IEC mea surements See Section 2 3 1 2 for more details e Battery Meas The status of the battery current measurement Turns it ON or OFF Battery pill required for this measurement e Battery Size The size of the battery of the hearing aid being tested IEC Settings e Equiv Noise Test Status of the EIN measurement Turns it ON or OFE Aid Settings e Sweep Start Delay The delay after the first tone is presented in a pure tone frequency sweep and before the first measurement is taken e Sweep Meas Delay The delay between frequencies i
114. d Conc Output Limiti 120 ie Target Formula WiL L1 Source oer i aF a i kH 2 z Die UP IQMM ta gelesen teat eee Frica START to run beet Prev EN for bocal mee Preas CEIT to lare mrem I F Fa a Figure 6 6 1 Testing directionality REUR 1 was tested with the source at 135 azimuth REAR 2 was tested with the source at 45 azimuth Curve 6 illustrates the directional advantage of the hearing aid 12 Reposition the patient so that the sound field speaker is placed at 0 or 45 azimuth The reference microphone should be repositioned so that it is fac ing towards the sound field speaker 13 Press LEVEL to re level the sound field speaker This will temporarily clear but not erase the reverse measurement 162 FONIX 7000 Hearing Aid Analyzer 14 Press START to start the frequency response measurement The reverse measurement will reappear when the measurement starts When the for ward measurement has stabilized press STOP 15 Look at the difference between the forward REAG 2 and the reverse REUG 1 frequency responses Figure 6 6 1 The forward frequency response should show more amplification than the reverse frequency response Take note of the differences in the RMS OUT of the two curves This will tell you the average amount of amplification advantage that the directional microphones provide 6 6 2 Determining the null When performing a directional test
115. ded Custom Output Limit 120 dBSPL Target Formula NAL RP WO SMH A A He L OO i OOo So BOP TOE OTUN T A Nmn Ls 1 2 1 D 4 Q is J 0 0 0 2 3 as 4 4 3 cis WO a Oo O D O e 1 L X a 2 2 2 2 2 2 2 2 2 Right Ear Source 65 dBSPL Use UPTOWN to select test level Use Probe and Reference microphones Press START to run test at selected curve Press MENU for local menu FL F2 FS User 1 Right Ear REAR 2 Curve Curve Composite 2003 08 12 F4 F5 FE FF F5 Select Crv Select On OFF Actions Sre Select 1erari13 Figure 6 4 9 Insertion Gain data format display To view curve data in the Real ear SPL screen 1 2 3 Enter the Real ear SPL screen Press MENU to enter the local menu Select Data Graph under Display using v a 154 FONIX 7000 Hearing Aid Analyzer 4 Use lt gt to select DATA 5 Press EXIT to return to the Real ear SPL screen The numerical data dis play will be shown 6 Use F2 to select the curve data you want to display 6 4 10 Deleting and un displaying measurements It is often convenient to temporarily clear one or more of the measurement curves without deleting them To turn off on the display of a curve without deleting it 1 Press F3 to open the pop up menu with the curve selections 2 Use v a to select the curve you want to turn off or on 3 Use gt to toggle the display of the
116. des should be as specified by the manufac turer THE GAIN OF THE AID INCREASES AS THE TRANSMITTER AND RECEIVER MOVE CLOSER TO EACH OTHER EVENTUALLY THE RECEIVER WILL OVERLOAD 4 No other wireless CROS BICROS MultiCROS transmitters are to be turned on near the test box 5 Calculators should be kept at least a foot 300 mm from the test box 3 3 8 Wire Type CROS and BICROS aids CROS CROS aids are similar to ordinary hearing aids except that the microphone and amplifier are separate units connected by a wire Both units may be placed inside the test chamber during testing 1 Place the orifice of the microphone unit at the reference position in the test chamber 2 Connect the amplifier unit to the appropriate 2 cc coupler See earlier sec tions for details 3 Place the coupler with the amplifier unit at the left side of the test area 4 Test as desired BICROS Test wire type BICROS aids just as you would wireless BICROS aids except instead of separating the two units and keeping them parallel place both units as Close as possible to one another with the microphone openings as close as possible to the reference circle Otherwise follow the steps given in Section 3 3 7 for BICROS aids 3 4 Basic Measurements In the Coupler screen of the 7000 analyzer you can perform the following mea surements response curves single frequency measurements three frequency averages harmonic distortion and intermodulatio
117. determined by the shapes and sizes of the components of the system Real Ear Occluded Response See Occluded Response The high and low points of the frequency range found in the ANSI test sequence conditions Real Ear Saturation Response A special case of the REAR for which the hearing aid is operated at its saturation level This is akin to the coupler measurement known as the SSPL 90 Real Ear Unaided Response See Unaided Response Glossary of Terms for the FONIX 7000 203 RMS SATURATION SINE TONE SMOOTHING SOFTWARE SPA SPL SSPL OSPL SSPL 90 OSPL 90 SWEEP TARGET TELECOIL UNAIDED RESPONSE UNWEIGHTED GAIN Root Mean Square An overall measurement of the signal going in or coming out of a hearing aid When measuring with Pure tones the RMS level at each individual frequency will be the same as the level shown at each frequency on a response curve When measuring with a Composite Tone the overall RMS level will be several dB higher than the level at each frequency on a response curve since all the frequencies are presented at once The condition where any further increase in input level will yield no further increase in output level A testing tone consisting of only one frequency Same as Pure tone A rounding off of a curve removing minor peaks and valleys to create a more readable curve using a method that is equivalent to warbling the input signal T
118. dketient 4X linn UPVTORH to tolit tet ewe Lee Le Right bo apbeet biji bom Press START to rum teat WHO for Jocal esru and HIT to lams FL FZ Fi Fa FS FE FH TEMP 1 Loft Ear 3 rut Tie letn Ds ghenerh HF G fFe ae Talat re Salant rAr Drusi Gre Salat Wta Taar Tagle i7 gH Figure 3 3 4D Comparison of couplers with open ear hearing aid Curve 1 was measured using the Open Ear coupler Curve 2 with an HA 1 coupler Curve 3 with an HA 2 coupler and Curve 4 is the KEMAR real ear response 3 3 5 Body Aids 1 Insert the coupler microphone into the HA 2 coupler The most consistent results for body aids can be obtained by locating the 2 cc coupler outside the test chamber preferably on a foam pad to isolate it from vibration 2 Snap the earphone receiver of the body aid onto the 1 4 recessed end of the coupler Figure 3 3 5A 3 Place the aid in the test chamber with its microphone opening as close to the reference point as possible See Figure 3 3 5B 4 Turn the gain volume control to the desired setting and set the switch for microphone operation not telephone coil or T 5 Close the lid and test as desired The aid s cord will not be damaged by closing and latching the test chamber lid Basic Sound Chamber Tests 65 Figure 3 3 5A Coupler setup Figure 3 3 5B Body Aid in test chamber 3 3 6 Eyeglass Aids 1 Follow the manufacturer s instructions for removing the hearing aid assem
119. ds to be treated with care and respect If you do so the two of you will be rewarded with a long happy relationship 1 7 3 Locating the serial number and software version When contacting the factory it is very useful if you have your serial number and software version handy This information will help us help you regarding repair upgrade and technical questions The serial number of your 7000 test system can be found on the back of the main module just to the right of the power switch See Figure 1 7 3A Introduction and Setup 2l ATTENTION Gai mia bility capit behind OHLY When mpage ip na a HOSPITAL GRADE prepac For seyii do qualified Bere ay Tr iif 1 ing Gauri FONIX 7000 Serial No 0003 FONIX 7000 HEARING AID TEST SYSTEM ELECTRONICS MOOGULE ELECTRA AA ri foto y S00 H ik Figure 1 7 3A Serial number location The software version of your 7000 test system can be found on the Opening screen See Figure 1 7 3B Press HELP to open a help window with more detailed service information This data may be requested if you call in with a repair related question Press HELP again to close the help window Fonix 7000 Hearing Aid Analyzer Copyright 2003 Frye Electronics Inc Frye Electronics Inc PO Box 23391 Tigard OR 97281 3391 USA Prone 503 620 2722 Fonix 7000 800 547 8209 Hearing Aid Analyzer Faxt 503 639 0128 Web wow Frye com CPU 100 4 RTEMS 0 58 na
120. e aid as described in Section 5 1 2 and setting up the analyzer as described in Section 5 1 3 follow these instructions 1 2 Press START from the ANSI 87 screen to start the test If you have enabled the telecoil test do the following when the sequence stops for the telecoil measurement Otherwise skip to step 3 a Open the lid of the sound chamber b Switch the aid to telecoil mode c While viewing TCOIL 10 mA m near the upper right corner of the screen try many positions for the hearing aid near the reference point until you find the position that gives the highest output with the least variability Usually the best position is with the hearing aid held in the vertical posi tion d Hold that position and press START This measures the telecoil output e Switch the aid back to normal microphone mode f Press START to resume testing Depending on the aid type selected and the gain of the hearing aid the ANSI sequence may stop for you to adjust the gain control to the reference test If the sequence stops a Open the lid of the sound chamber b While viewing the HF AVG readings in the lower center of the screen turn the gain control on the aid down until the MEASURED value match es the TARGET value within 1 dB c Close the lid If the MEASURED number is still correct press START to complete the test sequence 5 1 6 Viewing ANSI Results The test results for ANSI 03 ANSI 96 and ANSI 87 have a s
121. e Overcoming of the Head Baffle Effect c ccc ee ccc e ce eee eee eeeeeaaee 169 6 92 1 CROSS reer 45S on ea cag nie ned A hig N E oidate aon eeee Ea 169 6 922 BIECROS ema ant aaa a econ O lt a seems E ARA ven oe cae 170 6 9 3 Measuring Overall Insertion Gain 0 cece ccc eect e nce e eee n eect cent eee en teenie nees 170 6 9 3 CROS oii eee esa ye ee ck kk Be ETE Os si O ohh Rnd dd ahaa ede ARE Fad 171 6 9 3 2 BECROS 2a vee nre rnk chs oh kee tne OSs cbse a o DARA GEOR ace ESEA 171 6 9 4 Measuring Insertion Loss to the Good Ear CROS 00 ccc cee eee cece eseeeee eee erenn 172 Appendix A Specifications cc ccc cece cece nee eee ete e eee teeeeeeeeaees 173 Appendix B Calibration 2 0 00 ccc cece nnn n nee nnn Een EEE een EE Een EE DEES EEE EE EES 177 Appendix C Troubleshooting Guide nnsnnnsssnnsusrsserrsrsrrsrerrrrrrsrerererrereresrrrereer 183 Appendix D The FONIX CIC Feature nnn ccc c cece eee nce ne ee teen eee nee ete e een ne eennneees 185 Appendix E Fitting Formula Tables 0 c cece cece cee een eee cee e eee nee teen eee en ee eennneees 189 Appendix F Probe SPL Mode Description 0 c cece cence cee eee eee ee eee n ee een nett en ne eeenneees 193 Appendix G Glossary of Terms 0 0 ccc cece cece eee e eee nee een ee eset een Ee Eee stb EEE EEE EE 197 Chapter 1 1 Introduction amp Setup Welcome to the newest innovation in
122. e adapter 9 Insert the probe microphone adapter with the attached probe microphone into the calibrator 180 FONIX 7000 Hearing Aid Analyzer 10 Turn on the sound level calibrator and look at the Probe Mic level in the 11 12 Microphone Calibration window It should match the calibrated tone emit ted by the sound field calibrator If necessary adjust the gain of the probe microphone by using the Phillips head screwdriver to adjust the probe pot on the back of the remote mod ule of the 7000 Test System Match the levels as close as possible If you are unable to adjust the gain of the microphone to the level emitted by the calibrator you probably have a faulty microphone and should contact your local FONIX distributor or the Frye factory Press EXIT to return to the Opening screen B 2 Calibrating the insert earphone for the RECD The real ear to coupler difference RECD is a measurement that can be per formed when you have the Real Ear Option Quik Probe There are two parts to the RECD a coupler measurement and a real ear measurement The coupler measurement is considered a calibration procedure and needs to be done only when the probe and reference microphones are calibrated The RECD measurement is usually done with a 50 ohm insert earphone Eventually the 7000 Test System will also support an RECD method performed with a linear hearing aid but that has not yet been implemented 1 Insert t
123. e ee eee nett eens seen eee eeneenanes 16 1 6 2 Locating and arranging the 7000 test system 0 c cece eee eee e eee e eee eee eee enneeeanes 17 1 6 3 Connecting the Main Module amp Components eusuuessusnsrusrsreresesreserrrerrererrs s 17 1 6 4 Connecting the Real Ear Equipment 66 ccc cece cece c eee teen eee een ee en eee anneenanes 18 1 6 5 Powering up the 7000 test system 6 cece cece cece eee eee e eee e eee nen eee nn eee aeneeennes 19 17 Maintenance srein a oE ale teen cho ae ta niad pate whee El eal neath hed Oe aes 19 EPL Cleaning sic sacs oie ee eka E IEA Me choad a ied an Ss bind ahh rp hace T AG 19 1 7 2 Care amp Maintenance of your M1950E Coupler Microphone cceee cece cece enn eeees 20 1 7 3 Locating the serial number and software Version 00 00 cece eee e cece eee e eee eeeenneenes 20 1 74 Contacting the Factory 0 0 ccc cece cee eee eee eee eee e en eee ence ene seen eee eanes 22 17 5 Warranty sonia ett ib aed ace ees Aaa es Bede hes Sa ee ik 22 Chapter 2 General Operation 2 1 Operation of buttons iseenese orraa EEE nen EE EEE EEE EEE EE EE EEE EEE EE EE EEE EEE EE EEE ES 23 2 1 1 Using the function keys 0 cece cece ence ee ene n eee eee eee eee eee eens bene ee teen aes 23 2 1 2 Navigating through the screens cee cece ccc eee ee eee e eee e ee eee nee eenetenn teens 25 2 1 3 Using the pop up help windows 00 cece cece cece e
124. e eee e eee e ee eee ence een eee n ees 128 6 2 2 Placing the earhook and reference Microphone 0 0 c cece cece eee e cece eee eee eeeeeaaes 129 6 2 3 Inserting the probe tube 0 ccc ccc eee teen ene n tence EES e nese tenet teen es 130 6 2 4 Leveling the Sound Field Speaker 0 cece ccc cece ee eee n eee e cnet ee en teen eens 133 6 2 5 Setting up Body Aids cece cece cece ee eee ee e ene nee nn cette nee E e eee E ee Ean EE ee 135 6 3 Real Ear largets nnno a 00 2G eed A es ce Sede A eed ee ed eee oe 135 6 3 1 Entering an AUGIOgraM 6 ccc eee eee n ene nn een ee eee nn eee ene EEE EE EE 135 6 3 2 Deleting Audiometric Information 0 cece ccc cece eee cece eee e eee e teen een eeeeeaaee 137 6 3 3 Creating a Target nerro noe ts R FEE hegia ep edalcash buueaege etioer a AATE T 137 6 3 4 Entering Bone Datasc 2 3 5 eroro te aa a bas oi guile Seal lies wae a See ga dal Oa ded e 138 6 3 5 Performing an RECD measurement 0 cece cece cence eee eee e ee cette ee een ee eeeaaee 138 6 3 6 Modifying a Target nec eeck teeieeec tac taee end cana een dtl ee hein 141 6 3 7 Entering an REDD transform 0 ccc cece eee cece ene AE EEE PARDEE Eaa neag 143 64 Real Ear Measurements cece cece teen eee een e tent ee eee eee ene e eee eeeenn etn eeeeeennenes 143 6 4 1 Measuring in the Insertion Gain SCreen cee ccc cece c eee eee e een e eect e eect een eee e
125. e lower graph display in gain or SPL output TONE FILTER The weighting used for pure tone sweeps in real ear measure ments FLAT produces tones at each frequency with the same amount of ampli fication ANSI and ICRA produce tones with higher amplification at lower fre quencies and lower amplification at higher frequencies according to the ANSI and ICRA speech weighting respectively AUTO uses the ANSI weighting for pure tone sweeps below 85 dB SPL and the FLAT weighting for sweeps at 85 dB SPL and above Coupler measurements with pure tone sweeps are always FLAT weighted COMPOSITE FILTER Wide band speech weighting used in the Composite and Digital Speech signals See Section 2 3 2 3 Tone See Section 2 3 1 1 for an explanation of all the pure tone settings Tone Test Sequences ANSI 12 dB DIST The ANSI standard states that when measuring harmonic dis tortion if the amplitude of the response curve at the second harmonic is 12 dB greater than the amplitude of the response curve at the distortion frequency the General Operation 33 harmonic distortion measurement should be ignored Choose ON to apply this rule Choose OFF to ignore this rule ANSI OPTION Modifications to the ANSI test sequences VA CORFIG adds the modification requested by the Veterans Administration of the United States CIC adds CIC correction factors and is meant to be used with the CIC coupler BATTERY MEAS Status of the battery current measurement
126. e measurement Enter the Real ear Insertion Gain screen Press MENU to open the local menu Select Display using the up down arrow keys Use the right arrow key to choose between Gain and SPL ao FW N e Press EXIT to return to the Real ear Insertion Gain screen The bottom graph should now match your selection The Real ear SPL screen cannot display measurements in Gain All measure ments are displayed in SPL output Therefore the Display selection in the local menu is disabled To use an average unaided response It is also possible to display an average unaided response on the measurement screen instead of a measured response This allows the clinician to skip the unaided response measurement When the unaided response is set to aver age the REAR 2 curve is automatically selected at the first measurement curve instead of the REUR 1 curve To use an average unaided curve press MENU in the Insertion Gain or Real ear SPL screen Use the arrow keys to set Unaided to Avg Press EXIT to close 148 FONIX 7000 Hearing Aid Analyzer the local menu The average unaided response will now be displayed on the measurement graph To auto adjust the unaided response When using the SPL display in the Insertion Gain screen or when measuring in the Real ear SPL screen in other words when the unaided response is dis played in terms of SPL and not gain the unaided response includes the input signal used in the measu
127. e real ear measurement screen or the Audiogram Entry screen Select Fitting Rule under Targets with v a Use lt gt to select the desired fitting rule Use v a to select Client Age and use lt gt to input the desired selection If you have selected NAL NL1 the following menu settings are also avail able e Compression The compression kneepoint of the hearing aid If the hear ing aid has multiple compression kneepoints use the first one e No of Channels The number of channels of the hearing aid e Aid Limit Type of output limited employed by the aid Choose from Multichannel or Wideband Fit Type Type of hearing aid fitting used by the patient Choose Unilateral or Bilateral e Sound Field Position of the sound field speaker during real ear measure ments If the patient s threshold values were measured with a sound field speaker the same angle used for the audiometric measurements should be used for the real ear measurements e Ref Position Type of leveling used for the real ear measurement Head surface includes the patient inside the sound field recommended for best accuracy Undisturbed Field indicates leveling was done by holding the reference microphone in front of the sound field speaker Press EXIT to close the menu If you are in a real ear measurement screen you should see the new selected fitting rule noted under the Curve Characteristics box 138 FONIX 7000 Hearing Aid Analyzer
128. e reduction setting 172 mea surements 43 x 4 will be taken with every normal pure tone sweep 2 3 1 3 Delay times The 7000 test system allows you to refine your pure tone measurements with many different adjustments for delay times This choice is allowed because some hearing aid circuits take a longer time than others to adjust to changes in amplitude or frequency If the measurement is made too quickly an artifact in testing will be created If the measurement takes too long the test is longer than necessary In determining the length of time needed for a proper measurement a good rule is to use twice the published attack time of the hearing aid If you are unsure of the attack time you can experiment with longer times and shorter times and see if there is any difference in the test results Linear aids can be tested very quickly so a delay of 20 msec is usually fine Other aids are quite variable See Section 2 3 1 1 for a description of the available delay settings The 7000 test system has standard delay times that are determined by the aid type selection When you set the delay settings to Default the following delay times will be used MISC MEAS 1O START 1O MEAS 36 FONIX 7000 Hearing Aid Analyzer In addition to the delays the aid type will also have an effect on the way some measurements are made With a selection of ADAPTIVE the analyzer will throw away the first three measurements of all averaging including
129. e with the NAL NL1 non linear target the shape of the lin ear target will not change as the input level of the input signal changes Real Ear Measurements 151 6 4 6 Using Semi Auto and Fully Auto Mode The Real ear Insertion Gain and Real ear SPL screens have basic implementa tions of Semi Automatic and Fully Automatic test modes In Semi Automatic mode the analyzer automatically advances to the next measurement curve when the measurement is stopped That is if the user selects REUR 1 and takes a measurement the analyzer will automatically advanced the curve selection to REAR 2 This eliminates the need for the clinician to press F2 and manually advance to the next curve Semi automatic mode is available in both the Real ear Insertion Gain and Real ear SPL screens To activate semi automatic mode 1 Enter the Real ear Insertion Gain or Real ear SPL screen 2 Press MENU to open the local menu 3 Select Auto Test under Measurements v a Pressing START will jump to the beginning of the next section in the local menu 4 Choose Semi Auto using lt gt 5 Press EXIT to return to the real ear measurement screen The analyzer will now be in Semi Automatic mode Fully automatic mode automatically measures REAR 2 REAR 3 REAR 4 and REAR 5 in quick succession When REUR 1 is selected after pressing START to perform the unaided measurement the user must still press STOP to stop the test This will automatica
130. eal Ear Navigation screen 127 Real Ear Option 2 127 Real ear SPL 145 149 150 Real ear targets 145 REAR 145 147 148 Rear panel layout 13 RECD 138 180 REDD 142 143 Reference mic 162 Reference microphone 129 152 REIG 149 Release Window 116 Remote module 6 52 RESET 12 28 Res Crv Sweep Meas Delay 116 Res Crv Sweep Start Delay 116 REUG 144 146 REUR 146 147 148 REUR Auto Adjust 148 RS232 30 52 S Safety 14 Semi automatic 151 Semi automatic mode 93 Serial number 20 Setup 16 body 64 BTE 62 eyeglass 65 ITE 60 real ear 128 wireless CROS BICROS 66 wiretype CROS BICROS 68 Setup menu 28 Shape 84 SHORT 33 69 Signal types 69 Single frequency 73 151 Single tone See tone Smoothing 154 Software version 20 Sound chamber stand 10 Sound field speaker 6 128 Sound level calibrator 9 Source types 33 208 FONIX 7000 Hearing Aid Analyzer Specifications 173 Speech mapping See live speech mapping Speech weighting 158 SPL 145 147 149 150 193 START 12 28 Static test 101 Static Tone 95 STOP 12 28 Sweep Meas Delay 95 122 125 Sweep Start Delay 95 122 125 Swing arm 6 T Target 135 137 149 150 modifying 141 SPL 141 Targets 145 Telecoil 78 111 112 Telewand 79 111 Test Chamber Cable 5 Three frequency average 73 151 Three frequency sequence 151 Time 29 Toggle 24 Tone 151 Tone filter 32 36 Transducer 136 Troubleshooting 183 general 183 12 dB Dist 115 U
131. ear side Same setup as above except e Probe microphone over the good ear The difference curve labeled Insertion Gain on the screen shows the attenua tion of sound arriving at the good ear from the bad ear side Since this measurement excludes the external ear differences across individuals should be minimal GOOD BAD EAR EAR 12 pS SPEAKER PROBE MIC GOOD BAD AR EAR 12 SPEAKER A PROBE MIC NOTE Although the above two measure ments calls for the 7000 test system to be UNLEVELED with the reference microphone OFF the rest of the measurements in this section call for the 7000 test system to be LEVELED with the reference microphone ON Real Ear Measurements 169 6 9 2 Measuring the Overcoming of the Head Baffle Effect This section describes how to measure how well the hearing aid overcomes the head baffle effect The methods are different for CROS hearing aids than they are for BICROS hearing aids 6 9 2 1 CROS Unaided Measurement of good ear canal baffled by head Set up the 7000 test system as follows e Reference microphone ON e Sound field LEVELED pane BAD EAR e Unaided CUSTOM e Reference microphone over pinna of bad ear i e Probe microphone inside unoc cluded ear canal of good ear PROBE MIG EEERENGE WG e Loudspeaker at 90 12 inches from bad ear Aided Measurement of good ear canal baffle overcome by aid Same setup as above except e Aid in place in good ear and
132. easurement made in one of these screens will automatically be displayed in the other screen To measure the aided response 1 Follow the instructions found in Section 6 4 3 to measure the unaided response if desired Even if you don t want to measure the unaided response follow the instructions in Steps 1 7 in Section 6 4 3 to enter an audiogram enter the measurement screen insert the probe tube and level the sound field speaker 2 Insert the hearing aid into the ear being careful not to move the probe tube 3 Select the signal source with the F5 button Digital Speech is a good source type to use when measuring most hearing aids Press F5 to open the Real Ear Measurements 149 pop up selection menu Use the up down arrow keys to make the desired selection Press the right arrow key to complete the selection and close the menu 4 Use F2 to select REAG 2 By default this curve is set to 50 dB SPL i e soft speech To perform a medium speech curve measurement use the up arrow key to increase the source level to 65 dB SPL 5 Press START to take the measurement When the frequency response has stabilized press STOP to stop the measurement Measuring in the Real ear Insertion Gain screen For a description of the Real ear Insertion Gain screen see Section 6 4 1 In Figure 6 4 1 Curve 2 in the bottom graph shows the aided response Curve 6 in the top graph shows the real ear insertion gain REIG and Cur
133. easurements 171 6 9 3 1 CROS Unaided Measurement of good ear Set up the 7000 test system as follows GOOD BAD e Reference microphone ON FAR EAR e Sound field LEVELED e Reference microphone over pinna of bad ear e Probe microphone inside unoc cluded ear canal of good ear PROBE MIC 12 REFERENCE MIC e Loudspeaker at 0 12 inches from bridge of nose SPEAKER Aided Measurement of good ear Same setup as above except e Aid in place in good ear and set to user gain The difference curve labeled Insertion Gain on the screen shows the overall benefit of inserting the hearing aid 6 9 3 2 BI CROS Unaided Measurement of better ear Set up the 7000 test system as follows e Reference microphone ON BETTER BAD e Sound field LEVELED EAR EAR e Unaided response CUSTOM e Reference microphone over pinna of bad ear e Probe microphone inside unoccluded e Loudspeaker at 0 12 inches from bridge of nose pE J SPEAKER Aided Measurement of better ear Same setup as above except e Complete aid in place in better ear and set at use gain e Both transmitters on The difference curve labeled Insertion Gain on the screen shows the overall benefit of inserting the hearing aid 172 FONIX 7000 Hearing Aid Analyzer 6 9 4 Measuring Insertion Loss to the Good Ear CROS The method for measuring insertion loss in the patient s good ear is described in this
134. ed in the FP40 and FP35 analyzers have been incorporated into the 7000 Test System It is hoped that these improvements will make the 7000 flexible enough to adapt to any new test procedures as they become needed with the chang ing testing requirements of the hearing aid industry 1 2 Basic Test Functions The basic 7000 can perform the following coupler tests e Pure tone signal measurements e Composite and Digital Speech signal measurements e Phase measures for binaural hearing aid pairs e Group delay processing delay measurement of digital hearing aids e Battery Current as a function of amplitude and frequency e T O Curves e Attack and Release For both composite and pure tone measurements the following are possible e Special CIC hearing aid coupler measurements e Behind the ear BTE In the ear ITE in the canal ITC Open ear and body hearing aid measurements e Choice of either IEC 60118 7 or ANSI S3 22 2003 96 87 92 standard tests All tests can be installed as options An additional function that comes standard with the 7000 is RS232 communication with an external personal computer This allows remote operation of the analyzer from the computer and lets you save test results onto your computer s hard drive Firmware upgrades to the 7000 Test System can also be performed though the com puter 1 3 Options The 7000 test system has the following software and hardware options avail able Real Ear Option
135. ed into five main categories Display Measurement Source Aid and Misc Settings To skip ahead to the next category use the START button Display Settings e Data Graph The method of data display Choose between DATA numeri cal data and GRAPH e Display Type of display Choose between SPL output and Gain differ ence between input and output e Graph Scale Scaling used when making measurements NORMAL scales to the upper most curve AUTO scales to the current selected curve e Curve Label Label used for the two available ears Choose between LEFT RIGHT and A B Basic Sound Chamber Tests 95 Measurement Settings Coupler Type The type of coupler being used in making sound chamber measurements Selections of CIC and MZ turn on corresponding software correction factors see Sections 3 6 and 3 7 A selection of 2CC does not apply correction factors to the curve but will note a 2 cc coupler was used in the COR column of the Curve Characteristics Box The NONE selection will apply no corrections and leave the COR column blank Distortion Type of harmonic distortion used in a pure tone measurement Choose between 2nd 3rd and TOTAL See Section 2 3 1 4 Noise Red Tone Amount of pure tone noise reduction used See Section 2 3 1 2 Noise Red Comp Amount of composite noise reduction used See Section 2 3 2 1 Source Settings Output Trans Transducer used for the measurement CHAMBER uses the test bo
136. eee tenn eee e nee een ee eenneeeen teens 26 2 14 Using the local Menus 0 a a eee een n a eee nett en ee bn net aeaa s 27 2 1 5 Using the EXIT and RESET buttons 0 cece cece cece ee cee ee eee nee een eee enneeenn teens 28 2 1 6 Using the remaining buttons 0 ccc ec ccc eee eee ne cee e eee eee e ne eee ne tenn teens 28 2 2 SQUUp MENU zaor cin cee orcad EErEE ea as RIAA SEEE Core CREE TINA TAG ew eee dere aN ene 28 2 2 1 Saving and loading default settingS 0c cece cece cece cece e eee e eee e teen eee eeeteaaaes 29 2 2 2 Setting the date and time 0 ccc cece eee eee e eee ee ee ene teen teen ne eenn teens 29 2 2 3 Setting the User MOdE cece cee eee een e E eee ERAT ee ees 30 2 24 Explaining the settingS 0 ccc ccc cece eee eee teen e eee e eee e eee nee be beeen teens 30 2 3 SOUNCE TYPOS oin i ee ee ha ie Oh ane MOREL ERA ESS BORE Pua ie AI Baek tn nia 33 2 3 1 Understanding Pure tone Signals 0 cece ccc c eee cence eee teen ee een eee enneeenn teens 33 2 3 1 1 Pure tone Settings s vss sac44 Sect EE E E Gah EEEE E AE E eake ve temas eed 34 2 3 1 2 Noise reduction 0 0 0 c ccc ccc ccc ce cence ent n nee been eens bene tn een en eenes 35 2 3 123 Delay time S ezespen eaten ea on ht tat hate a a e a aa ate 35 2 3 14 Harmonic distori one rccerererisiciia tiei cee EEE AENEA 36 23 15 Paredone Hhelerrrorerai ierni Erua ECAR LAEE AAA ERUEN 36 2 3 2 Understandin
137. eees 60 3 3 3 Behind The Ear BTE Aids 00 cece eee cence cence cence cece eect eee e ee eee eee eeeeeeeees 62 3 34 Open Ear Hearing Aids dasen E aa E ga E yy sels gage SEE oa AE ae 62 3 3 5 Body Aids niser tured sad ee E OA e da baile 22 ee Sires a Fades E ess 345 ea 64 ERRA SUIE E I EEA AE EEEN ASAT AAA E E EAN E 65 3 3 7 Wireless CROS and BICROS Aids ccc cece eect teen eee teen ee eee ee eee aeeeeeeeeeaaaee 66 3 3 8 Wire Type CROS and BICROS aids 0 ccc cece cece e eee eee eee ne eeen eee enneeenn teens 68 3 4 Basic Measurements 0 cece ccc ee cee ene eee ee EEEE rene nner n eee ene EREE 68 SAT Signal Types as aaao seeder cede syead Sana eane sas ddd eyes Redan degdeeresaeees 69 34 2 RUANING A Test CURVE ayes sinks oe aeeiciaslns ede daa ies TT debe eds Aine E E a Cee Sok 69 IFEX Mpeni aa eae tht Moneta hes eth ee a a sale heated tne ht eet ek 70 344 Deleting measurements and settings cece cece cece ee cee ee eee eee eee eee ene teen teens 72 3 4 5 Running a Single Frequency Measurement 0c cece cece e eee teen ee eee eee neeeeenn tenes 73 3 4 6 Running a Three Frequency Average 6 cece cece ccc ceeec eee eee e ee teen ee eenneenen teens 73 3 4 7 Measuring Harmonic Distortion 0 cece cee ee cee eee ee ee eee eee en eee eeeeeeeeeeeeeees 74 34 8 Intermodulation Distortion 00 ee ce cece ence eee eee e eee ee eee eee e eee eeeeeeeeeeeaa
138. eel Plastic Roller Figure 2 4 4A The internal printer Step II Loading paper into the printer 1 2 3 Turn on the instrument Place the Head Up lever into the up position See Fig 2 4 4B Unroll approximately six inches of paper from the roll and insert the paper s leading edge into the bottom of the printer directly behind the rub ber roller See Fig 2 4 4C eeu mn Head Up Lever in Up Position i MM UpPosition load unload paper Middle Position no function Down Position ready to print Figure 2 4 4B Head Up lever in up position General Operation 47 Insert behind rubber roller and feed with ihumbwheel Figure 2 4 4C Loading paper into the printer 4 While holding the paper in place behind the rubber roller manually turn the thumbwheel to advance the paper approximately one inch Never press the FEED button while the Head Up lever is in the up position See Note 2 at the end of this section 5 Center the paper on the rubber roller Visually inspect the paper path to ensure that the paper advances smoothly without hitting the edges of the printer If necessary manually pull on the end of the paper until the paper is centered and does not hit the edges of the printer 6 Place the Head Up lever into the down position Please read the caution note below before proceeding Press the FEED button to advance the paper Continue pressing it until the paper advanc
139. ement of the occlusion effect with the adjusted vents The REIR curve in the upper graph is a measure ment of the difference between the two vent configurations 6 5 Digital Hearing Aids All digital aids can be tested but some of the high end models require a little more thought and care these aids have a noise suppression feature also known as speech enhancement This noise suppression not to be confused with the automatic compression of AGC hearing aids checks if the sound going into the hearing aid is a continuous signal that could be regarded as noise If the aid decides that the sound is noise it lowers the gain at the corresponding frequencies Conventional testing techniques such as a pure tone sweep or the Composite signal can cause the high end digital aid to go into this noise reduc tion mode This means that the gain or output you see on the analyzer s display will not necessarily reflect the normal response of the aid in speech 6 5 1 Using Digital Speech The Digital Speech signal was developed in order to test noise reducing digital hearing aids without fear of them going into noise suppression mode It does this by taking the standard Composite signal and interrupting it randomly The digital hearing aid responds to this modulated signal as it would response to normal speech The advantage of Digital Speech is that the 7000 analyzer treats it just as anoth er signal source You don t have to test the digit
140. ement or continue to test as desired Figure 3 4 10B Testing with the Telewand 3 4 11 Measuring directionality Although directional hearing aids can have different types of polar maps and two or even three microphones the basic concept is fairly simple speech sound from in front of the hearing aid wearer is louder than noise from behind him The FONIX 7000 hearing aid test system cannot give you a polar plot of the directional hearing aid response but it can provide you with the basic informa tion of how much directional benefit the hearing aid wearer is receiving and at which frequencies The directional test takes advantage of the speaker placement in the large sound chamber and the flat testing surface that makes it easy to position the hearing aid for testing There are two measurements one where the hearing aid is posi tioned so that it is facing towards the sound chamber speaker and one where the hearing aid is positioned so that it is facing away from the sound chamber speaker You should use the same input signal for both measurements The source amplitude used for this measurement should be greater than the noise floor of the testing environment but less than the compression knee point of the hearing aid if possible 50 dB SPL is usually a good choice Basic Sound Chamber Tests 81 Speaker Placement The speaker in the 7000 sound chamber is positioned on the right side of the chamber at a 45 angle as illustrated in
141. en the function keys are used to navigate between the vari ous measurement screens For example pushing F1 in the Opening screen will take you to the Coupler screen Toggle In a measurement screen when a selection for a function key has only two pos sible options pressing the function key will toggle between those options For example a function key setting the ear tested will toggle between left and right A red box will appear briefly around the function key box on the dis play This box means that the selection is in the process of being toggled Pop up Menu In a measurement screen when there are several possible selections to be made with a function key pressing the function key will bring up a pop up menu When this happens use the v a keys to select the desired setting and then use gt to perform the actual selection For example in the Coupler screen pressing F5 will bring up a selection of source types To select the desired source you would use v a To complete the selection you would press gt General Operation 25 2 1 2 Navigating through the screens The function keys are used to move from screen to screen Here is a flow chart of all the available screens and the buttons used to open each screen Some of the screens will only be available to you if you ve ordered a certain option OPENING SCREEN F3 ANSI 3 22 F4 ANSI 3 42 F5 Other Tests Couple
142. enu Use F3 to select the full on gain FOG amplitude used in the test sequence We recommend setting this to AUTO which will automatically use the appropriate amplitude This step does not apply for ANSI 03 Use F5 to select whether or not to perform a telecoil measurement Press MENU to enter the local menu and make any desired selections See Section 5 1 9 Use F7 to return all ANSI settings to their power on default conditions Use F8 to display all selected ANSI settings 5 14 Running an ANSI 96 or an ANSI 03 Test After leveling the sound chamber as described in Section 5 1 1 setting up the aid as described in Section 5 1 2 and setting up the analyzer as described in Section 5 1 3 follow these instructions 1 Press START to begin the test Usually the 7000 test system will pause during the measurement process in order to let you adjust the gain of the hearing aid to the reference test position a Lift the sound chamber lid and adjust the gain control of the aid until the RTG MEASURED gain matches RTG TARGET b Close the sound chamber lid when finished c Look at the display again The MEASURED gain should be within 1 dB of the TARGET gain for ANSI 96 or 1 5 dB for ANSI 03 Automated Test Sequences 111 2 Push START to continue the test 3A If you chose to perform a telecoil measurement do the following steps when the analyzer pauses If you are running an ANSI 03 test of an AGC aid and are n
143. enu General PRINT LABEL Status of the printing label Choose ON or OFF PRINTER Printer used for printouts Choose INTERNAL or EXTERNAL See Section 2 4 EXT PRNT COLOR Color used when an external printer is selected Choose BLACK amp WHITE or COLOR EXT PRNT LANGUAGE Language used when the external printer is selected Choose HPCL or EPSON EXT PRNT SCRNS PAGE The number of screens printed on a page using an external printer See Section 2 4 7 RS232 BAUDRATE Baud rate of the RS232 connection This is the speed of the connection of the analyzer with a personal computer The Windows based pro gram used on the computer end will need to have the same baud rate selection Other AID TYPE Type of hearing aid being measured Choose between STANDARD linear AGC and ADAPTIVE AGC This will affect the delays of pure tone sweeps as well as some other measurements See Section 2 3 1 3 for details GRAPH SCALING Scaling used when making measurements NORMAL scales to the upper most curve displayed AUTO scales to the current selected curve USER The selected user mode See Section 2 2 3 for details General Operation 31 START SCREEN The screen shown when the analyzer is powered on or the RESET button is pressed COUPLER sets this screen to the Coupler Multicurve screen OPENING sets this screen to the Opening screen with the Frye logo Date Time YEAR MONTH DAY HOUR MINUTE Current date and time See Section
144. er an upgrade Call the factory or your local distributor for more information The following test sequences are available e ANSI S3 22 2003 ANSI 03 e ANSI S3 22 1996 ANSI 96 e ANSI 3 22 1987 ANSI 87 e ANSI 3 42 1992 ANSI 92 IEC JIS ww ww 5 1 ANSI 3 22 The ANSI S3 22 automated test sequences allow you to test hearing aids accord ing to the ANSI S3 22 standards You can use the ANSI tests to control the qual ity of the hearing aids that you dispense Compare the manufacturer s specifi cations with your own ANSI measurements of an aid If they do not conform within expected tolerances you can contact the manufacturer There are three different versions of the ANSI S3 22 standard ANSI 03 ANSI 96 and ANSI 87 This is because the standard periodically gets upgraded by the ANSI standards committee After the ANSI S3 22 standard has been updated the FDA reviews it and eventually approves it to be used for labeling the specifi cations of all hearing aids manufactured in the United States The ANSI 96 standard was officially approved by the FDA on March 17 2000 This means that any hearing aid designed after this date must be labeled to the ANSI 96 standard However if a manufacturer designed a hearing aid before this date they can continue labeling newly manufacturered aids of the same design to the older ANSI 87 standard ANSI 03 which was approved by the FDA in November of 2005 is the newest version of the
145. er octave starting with 3 dB down at 900 Hz Some clinicians how ever may prefer to use the ICRA speech weighting The ICRA speech weighting was taken from a CD of sounds developed by the International Collegium of Rehabilitative Audiologists ICRA and based on the long term average speech spectrum The ICRA rolls off the high frequencies much more quickly than the ANSI spectrum To switch to using ICRA 1 Press MENU in the Coupler screen 2 Use v a to select Composite Filter under Measurement Settings Use the START key to skip ahead sections if necessary 3 Use lt gt to select ICRA 4 Press EXIT to return to the Coupler screen Basic Sound Chamber Tests 85 5 Use F5 to choose the DIG SPEECH signal source It will now have the ICRA speech weighting See Figure 3 5 2 for a comparison of an aid tested with the ANSI and ICRA speech weightings 5 Use F5 to choose the DIG SPEECH signal source It will now have the ICRA speech weighting See Figure 3 5 2 for a comparison of an aid tested with the ANSI and ICRA speech weightings FONE THRE Fi Ab TZER r a flr g Tarca Compe ie ARG eigid Chiiir Love bed Projected Hiii Pohlin dE WI z Source ice a Uie LPO to de eee eet laual Lhe WITSE wj H e Ha a Friii START 4a ie selected curve Friii for Bacal nren bie Delete come it on tried Cursele Te hed Py Test Toggle Figure 3 5 2 Comparison of a digital aid tested with Digit
146. es smoothly The back tension device should automatically correct a misaligned paper feed If the paper is not aligned properly it may krinkle on one edge If the paper continues to krinkle after feeding 12 inches place the Head Up lever into the up position and repeat steps 5 thought 6 CAUTION Do not allow the paper to feed back into the rubber roller It may be necessary to use your fingers to guide paper out and away from the rubber roller If the paper has a severe curl it may have a tendency to roll back under the rubber roller and cause a paper jam If this occurs stop feed ing the paper immediately remove it from the roller and reload the paper FONIX 7000 Hearing Aid Analyzer 8 Tear off excess paper by pulling the paper against the thermal head at approximately a 45 angle 9 Close the printer door Press the FEED button to advance the paper through the printer door slot You can tear off excess paper by pulling it upward against the tear strip on top of the pritner door opening at approximately a 45 angle You are now ready to print Note 1 Whenever the printer door is opened you will need to repeat steps 8 and 9 Closing the printer door without tearing the paper at the thermal head can Cause a paper jam which can damage the printer Note 2 If the FEED or PRINT button is pressed while the Head Up lever is in up or middle position the printer may fail to respond to all subsequent key commands
147. ess STOP to stop the measurement Use F2 to select CRV 2 Use F5 to select COMPOSITE Make sure the signal amplitude is the same as selected in Step 4 Press START to begin the measurement Leave the signal on for at least 15 seconds This should allow the noise suppression feature time to activate When the measurement has stabilized press STOP Compare CRV 1 and CRV 2 If the curves are right on top of each other the aid is responding to the Digital Speech signal just as it would respond to the Composite signal This could be an indication that the digital suppression feature is either not enabled or not present on the hearing aid Figure 3 5 4 gives an example of a hearing aid that is amplifying the Digital Speech sig nal and suppressing the Composite signal FORMIE TIFE Fite ALTER Leer Lae Lar uret Dh ia Bi im e Bo ia oror Compeeiie A bbe igre Chaska Love bed Projected Motte Pektin AE source G8 oe nah UFION to balast eet bawel lie PETS red He roe F A HREJ ta Pun bani ai selected carve Friii for baal morn x Figure 3 5 4 Digital Noise Suppression test CRV 1 was measured with Digital Speech CRV 2 was measured with the Composite signal 88 FONIX 7000 Hearing Aid Analyzer 3 5 5 Understanding Terminology With the new testing terminology of hearing aid analyzers combined with the new technology of hearing aids it s easy to get terminology confused Noise Reduction is a ter
148. even when the lever is returned to down position If this happens it will be necessary to power off the instrument and restart 2 4 5 Unloading a partial roll of paper 1 Place the Head Up lever in the up positon 2 Use the thumbwheel to unwind the paper from behind the rubber roller 3 Push the roll of paper back and up then lift out 2 4 6 Using an external printer You can hook up an external printer to your 7000 test system to print your results on normal office paper This eliminates the problem of fading associated with thermal printouts and often makes it easier to store your test results You can use any external printer that supports HP PCL Hewlett Packard Printer Control Language version 3 0 or the Epson printer language ESC P2 The print er should have a parallel interface We keep a list of printers that work with our analyzer on our website http www frye com products analyzers exprinter html 1 Unplug the 7000 test system and the external printer from any power source 2 Connect a standard printer cable to the external printer 3 Connect the other end of the cable to the connector labeled PRINTER on the back of the main module of the 7000 test system 4 Plug the 7000 test system and the external printer into their respective power sources 5 Follow the directions found in Section 2 4 1 to select the external printer in the 7000 software If you want to set the printer language or whether to print in color o
149. f you would like to predict the UCL values Pascoe 1988 is used for calculating UCL values 8 Press F4 and select COPY EAR with v a if you would like to copy the data from the selected ear into the other ear Press gt to make the selection This is useful if your client has a similar loss in both ears PONIN TIFE Jot HHL YZER Auch cir Left Right gt a fu e HTL ju oA uu F Hy E Line UPS to pebect Pregame Une LEP TREAT ti mie the d Preii MENU for bocal mere Freee EXIT to lira tre Fi Fa Fa Figure 6 3 1 Audiogram Entry screen To specify the transducer used to take the audiometric measurements press MENU and use the arrow keys to specify the Aud Transducer under Targets Real Ear Measurements 137 6 3 2 Deleting Audiometric Information If you make a mistake it s often useful to be able to delete all or part of the inputted audiometric data To do this 1 Z Press F4 and use v a to select the data you would like to delete You can delete the client s HTL UCL Bone and RECD Selecting This Ear will delete all data in the selected ear Selecting New Client will delete all data in both ears Press gt to perform the action 6 3 3 Creating a Target Once you input an audiogram Section 6 3 1 a target will automatically be cre ated when you enter a real ear measurement screen To change a fitting rule 1 ao AeA WwW N Press MENU from th
150. g Composite Signals 00 cece cece cee eee ee eee n ee een ee eenneeenn teens 37 2 3 21 NOISE FEAUCTION isser ekan E E A EA eereeod ty 38 2 3 2 2 Intermodulation distortion 00 c cece cece eee eee e eee e cece ence nee eeeanneeennes 38 23 2 3 Composite Er a ara aa era a LEA OARE ARR N Rae Bled ena t ad 39 23 24 Composite ty pec an ice EEEE EEE E es O E Ra eed E E E E aa 40 2 3 2 5 Composite source levels serine e EEn EET E OAA EEA AA E EAN 41 2 3 2 6 Digital Speech technical details 0 0 cece cece cece eee cen e eee reece ene eenanes 42 22 PHINUNG sacsceigg diy a a e a a ates a a a ea 2d a a e aden us ee AAMT te aed 42 24 1 Choosing a printefasci c 00e eet i tala e tes hd Ad eed he a eres 42 24 2 Addinga label nocere Ma teat E boa et deen odes Ve win ANE EER 43 24 3 Using the internal printer aerenc rerna E EEE es ees ede pence gems vee dedeinaaeuadeneneees 4y 244 Loading the thermal paper 0 0 ccc cece cece cece eee e eee e eee eee een teen neeeen teens 45 24 5 Unloading a partial roll of paper 0 0 cc ccc cece cence cece eee e eee e ee nee een eeteeaaaes 48 24 6 Using an external printer 00 cece cece ec eee ee eee e eee ne eee n een ne tenn tees 48 24 7 Putting multiple screens ON a page 6 eee e ec ee ee ceeee ec e eee teen eee ee eee en ne tenn teens 49 2 5 Display amp Datas renni ot oes bex cece keg titee A Ponda Gad a Sade tence Pin dalek dose 49 2 5 1 Vie
151. g threshold level UCL uncomfortable level Source Type This identifies the type of source used to make the curve Each curve is identified by three letters First letter C Composite P Pure tone D Digital Speech Second letter For pure tone N Normal pure tone F Fast pure tone S Short pure tone For Composite or Digital Speech W Weighted composite F Flat weighted S Spectrum Third letter P SPL measurement power G Gain measurement Note When it s possible to toggle between Gain and SPL in the local menu the 7000 test system will convert most curves back and forth between the two for mats Source Transducer This identifies the transducer used to make the measure ment Chamb means sound chamber S E means sound field Tcoil refers to a telecoil board or telewand transducer Source Amplitude This identifies the amplitude of the signal used to make the curve General Operation ol RMS Out The root mean square of the measured curve Correction Factors COR The coupler correction factors used to make the mea surement Coupler screen only Noise Reduction The noise reduction used to make the measurement See Sections 2 3 1 2 and 2 3 2 1 Lastly just to the right of the Curve Name column the 7000 test system uses symbols to describe the display status of the curves Here is the legend for those symbols Curve is completely on the graph e Curve is me
152. gh a programmed test sequence without the need of user intervention The analyzer will pause only when it reaches a programmed pause which allows the user to make adjust ments to the hearing aid before proceeding with the rest of the test sequence A programmed pause will be indicated by a horizontal line across the Curve Characteristics box 1 Load a test sequence You can do this by following the directions in Section 3 8 1 to create a new sequence or by loading a previously saved sequence by following the directions in Section 3 8 2 2 Use F6 to select FULLY AUTOMATIC Press F6 Use v a to select FULLY AUTOMATIC Use gt to complete the selection and close the pop up menu 3 Use F2 to select the curve number to start the sequence 4 Use START to begin the test sequence The test sequence will continue until the analyzer reaches a programmed pause 5 Adjust the hearing aid if desired and press START to continue the test sequence if there are more curves to measure after the programmed pause Use F6 to turn the AUTO TEST OFF when you want to return to normal test ing mode 3 8 4 Testing in Semi Automatic Mode In semi automatic mode once you have finished a measurement by pressing the STOP button or allowing a pure tone sweep to complete the analyzer will automatically advance to the next curve However the next measurement will not be taken until you explicitly press the START button 94 FONIX 700
153. ghted 2 3 2 Understanding Composite Signals There are two types of composite signals Composite and Digital Speech The Composite signal is a continuous broadband signal containing 79 different fre quencies presented simultaneously This signal is usually speech weighted which means that the lower frequencies have a higher emphasis than the high er frequencies The Composite signal is both a faster and a more realistic signal than a pure tone sweep because there is no waiting for a progression of tones to complete and like speech a broad spectrum of frequencies is used simultaneously The Composite signal updates several times a second Digital Speech is an interrupted version of the Composite signal used for test ing high end digital hearing aids Many high end digital aids though not all use a technology called speech enhancement or noise reduction These aids respond to any continuous signal as if it were noise and lower the gain at the offending frequencies Unfortunately these aids regard the Composite signal or pure tone sweeps as noise making them difficult to test using traditional meth ods Digital Speech was developed as a way to test these high end hearing aids Instead of presenting a continuous signal it presents an interrupted signal that the aid regards as speech instead of noise The Composite and Digital Speech signals can be used with several different types of speech weightings ANSI ICRA
154. graph represents that patient s dynamic range of hearing 2 L M H dotted lines indicating the real ear prescriptive targets at 50 65 and 80 dB SPL When NAL NL1 is not the selected fitting rule only the M target 65 dB SPL will be displayed 3 l m h dotted lines indicating the unamplified the region of average unamplified speech These lines are called collectively the LTASS long term average speech spectrum They can be used as a comparison against the amplified speech response 164 FONIX 7000 Hearing Aid Analyzer Targets Ages Sagbe Dette ipet bate HTL ceo Hering Theephofd Lesi LIT LLLLLL Liss Tirip EIN H Hiddla Target HIET HHHH High Target UG CES Upper Comfort bevel LIS Sobel Deri pics DIDIT Lda LTAGS lave meme Hid LTS level Vinh High LTRS lal A E iki 2 START t glee measurement Teas Cont iran uth SOP oe prere F Figure 6 8 Visible Speech screen before a measurement is taken The shaded regions are below and above the patient s thresholds and uncomfortable levels The L M and H lines rep present the real ear targets at 50 65 and 80 dB SPL The I m and h lines represent the region of unamplified speech 6 8 1 Performing Visible Speech measurement 1 Enter the patient s audiogram into the analyzer as described in Section 6 3 1 Press EXIT from the Audiogram Entry screen to return to the Real ear Navigation screen Press F5 to enter the Visible Spee
155. he HA 2 coupler for open ear hearing aids because unlike the BTE aids for which the HA 2 was designed open ear hearing aids are not attached to an ear mold Basic Sound Chamber Tests 63 We have also developed a non standard coupler for open ear hearing aids It has two design purposes 1 To make an convenient connection between the hearing aid and the coupler and 2 To provide a more real ear like frequency response than is possible with an HA 1 or HA 2 coupler Figure 3 3 4C shows a picture of the open ear coupler with an attached hearing aid Figure 3 3 4B HA 1 Coupler Figure 3 3 4C Open ear coupler Figure 3 3 4D contains an example of a comparison of an open ear hearing aid tested with an open ear coupler Curve 1 an HA 1 coupler attached to the open ear hearing aid with Fun Tak Curve 2 and an HA 2 coupler with an open ear attachment Curve 3 The dark line Curve 4 in the graph represents the KEMAR real ear gain response of the hearing aid As illustrated the open ear coupler provides the measurement most like the real ear response of the hearing aid FONIX 7000 Hearing Aid Analyzer FONE TYPE 7000 AELTER Coupler Left Ear Orus Cha ber Lit be Curvy m Suro FAS Dor MR CLIE WG Chi Glad DAG Oei TH me Get Cid OF Cham CHG Geb ee ah CHG Cham Cu Chae O89 GL Teab CLA OHG Crimi n ESA hy ae da di ESTESTERGH Grep Ditech EL iigh Chane Lave ad Biles Tore OF Projected Motio Re
156. he amount of time the first tone in an I O sweep is pre sented before the measurement is made See Section 2 3 1 3 I O MEAS DELAY The amount of time each subsequent tone in an I O sweep is presented before the measurement is made See Section 2 3 1 3 DISTORTION The type of harmonic distortion measurement made during a pure tone sweep See Section 2 3 1 4 STATIC TONE A continuous tone or series of tones presented in the Coupler screen when a pure tone sweep Composite or Digital Speech signal isn t run ning This can be set to SINGLE for a pure tone signal and AVG for a running three frequency average RESET FREQ The frequency the analyzer returns to when RESET is pressed AVG FREQS The frequencies used for averaging in pure tone measurements Each frequency set is represented on the screen by the highest frequency in the set The sets are General Operation 35 HFA High Frequency Average 1000 1600 2500 SPA Special Purpose Average 800 1250 2000 SPA 1250 2000 3150 SPA 1600 2500 4000 SPA 2000 3150 5000 IEC HAIC 500 1000 2000 2 3 1 2 Noise reduction Noise reduction is used in noisy testing environments Pure tone noise reduc tion takes several measurements at each frequency and averages those measure ments together Larger noise reduction numbers lead to smoother curves but increase the amount of time it takes to complete a pure tone sweep For example if you select 4 as the pure tone nois
157. he current select ed curve when REAG 2 5 are selected When REUG 1 is selected Target Curve A uses the source settings of REAG 3 This only applies when the NAL NL1 fit ting rule is selected All other fitting rules on the 7000 are linear which means the target does not change with respect to the source type and amplitude of the signal Most of the operations of the Insertion Gain screen are identical to the opera tions of the Real ear SPL screen Therefore most of the instructions found in this section apply to measurements performed in both screens Any differences between operations in the two screens are noted To enter the Insertion Gain screen press F2 from the Opening screen to enter the Real ear Navigation screen Then press F3 FOHIE TYPE Tis GAAL TER Real Tar lnertion Gain Cures Darii jii Cures ir Mams litl hps irea AA mis a ae aN 5 zini T Targ Hopee AI bbe ioe Soured Field Leva bed Bise Tore GFF Prejected Hoje Peestions a teference Hic On Geo hdner Lo Ura ded Cuneo Output Limiti 2a ce Target Formula WiL ALL ct a cee 7 a i GRH es Uie UPHAM ta gelesen teat besel Prete START 1o run beet Frem gcal sear Preas LEII fo lare nren F p a Figure 6 4 1 Real ear Insertion Gain screen Curve 1 is an REUG unaided measurement Curve 2 is an REAG aided measurement Curve 6 is the REIG insertion gain curve Curve A is the real ear prescription target Real Ear Mea
158. he earphone connector into the inch Earphone jack on the back of the 7000 Test System Plug the other end of the earphone into the tubing of the ear level adapter attached to an HA 2 coupler Attach a new probe tube to the probe microphone Thread the probe tube through the edged side of the probe microphone adapter so that the probe tube sticks out a couple of millimeters from the other end of the adapter See the setup for calibrating the probe microphone in the previous section The probe microphone adapter is used in the same manner Secure the probe tube in place by putting a dab of Fun Tak on the edged end of the adapter Insert the adapter into the HA 2 coupler Press MENU from the Opening screen to open the Setup Menu Press F4 to perform the measurement The screen will briefly display that the measurement is being taken and saved No further action is necessary Press EXIT to return to the Opening screen Calibration 181 Figre B 2 Calibrating the insert earphone 182 FONIX 7000 Hearing Aid Analyzer Appendix C 183 Troubleshooting Guide These are the most common problems that typically cause instrument failure Please check these troubleshooting suggestions and follow the procedures out lined in this manual before contacting your local service representative or Frye Electronics General Problems No power a Check ON switch s b Make sure the the power cable is plugged into a wo
159. he keys of the remote module are a sub set of the keys of the front panel of the main module This means all functions performed with the remote module can also be performed in the same way with the front panel Since there are only five function keys on the remote module and eight function keys on the main module there will be some operations particularly in coupler mode that will only be able to be performed with the front panel and its extra three function keys However we have made a special effort to ensure all real ear functions can be performed with the remote module allowing you to step away from the main module during the measurement process and make any necessary adjustments to your client and testing situation General Operation 53 Figure 2 7 Remote Module 2 8 Leveling Leveling is the process by which the response of the sound chamber or sound field is measured and computer corrected so that a flat sound field is achieved Sound chamber leveling can be saved into permanent memory but sound field leveling for real ear measurements must be done for every patient and every ear See Section 3 2 1 and Section 6 2 4 for instructions on how to perform coupler and real ear leveling respectively Here are some technical details on the leveling status messages e UNLEVELED Leveling has not been attempted and sound is uncorrected e LEVEL ERROR or LEVEL FAILED An error happened during leveling and source is uncorrected
160. he programming part of a computer system Special purpose average according to ANSI S3 22 the averaged response at specially designated frequencies Sound Pressure Level Expressed in decibels dB a logarithmic measure of the energy amplitude of a particular sound as compared to the energy of a specified reference sound Saturation Sound Pressure Level The greatest SPL that a given amplifier can produce Saturated Sound Pressure Level for an input of 90 dB SPL A sequence of pure tone frequencies which generates a frequency response curve A curve based on an audiogram and a prescription strategy presenting the theoretically optimum response that a hearing aid should have for a particular hearing loss Same as COIL In the 7000 it is an accessory that generates a magnetic field for testing the telephone pickup of a hearing aid The telecoil is a standard feature with the 7020 sound chamber A frequency response measured inside the ear canal without a hearing aid in place Also known as External Ear Effect the Unaided Response consists of the combined acoustic affects of the head torso pinna and ear canal When measured in a real ear as opposed to a manikin it is called the Real Ear Unaided Response or REUR A measurement of the amplification gain of an aid using an input signal source that has equal power across all test frequencies 204 FONIX 7000 Hearing Aid Analyzer WARBLE TONE
161. he serial number and the avail able options This information is important in identifying your equipment when you communicate with the company about your FONIX 7000 test system 1 7 Maintenance In order to ensure accurate testing we recommend yearly calibrations of your coupler microphone For those units with the Real ear Option we also recom mend yearly calibration of the probe amp reference microphones and the sound field speaker These calibrations can be performed by any Frye distributor or by yourself with the aid of a sound level calibrator such as a Quest QC 10 Please see Appendix B for calibration instructions 1 7 1 Cleaning For your safety disconnect the 7000 from mains power while cleaning Wipe the 7000 with a slightly moist but not dripping cloth Use plain water or water with mild dish washing detergent Wipe away any detergent with a slightly moist cloth Finally use a soft dry cloth to eliminate any lingering moisture Never allow fluid to enter the 7000 e enclosure e power switch e power connector e electrical connectors e front panel buttons 20 FONIX 7000 Hearing Aid Analyzer The 7000 microphones should be wiped with a dry cloth Excess moisture may damage the microphones Solvents and abrasives will cause permanent damage to the 7000 1 7 2 Care amp Maintenance of your M1950E Coupler Microphone Microphones are perhaps the most delicate of FONIX products They require care and concern when
162. he test The end of the interval is the time selected by the user with F6 and F7 for the Attack and the Release tests respectively The available time intervals range from 10 ms to 2000 ms These settings do NOT change the duration of the test Technical Details e In order to determine the attack and the release times of the hearing aid the 7000 analyzer calculates the settling amplitude of each measurement and uses the tolerance setting to achieve the final test result The settling amplitude is calculated by averaging the last 16 measurements of the test The attack or release time is the first time the aid reaches this ampli tude within the set tolerance The tolerance is one of the settings that is changeable in the local menu e Use F1 to select ears The 7000 analyzer can temporarily store one Attack amp Release test per ear This data is erased by measuring over it pressing RESET or turning off the analyzer e The settings used for a displayed test are shown in a box to the right of the attack graph The settings that will be used when START is pressed are shown below this box Chapter 5 107 Automated Test Sequences There are several automated coupler test sequences available for the 7000 hear ing aid analyzer The test sequences present on your analyzer are dependent upon the features purchased when you ordered your unit If you would like access to a test sequence not present on your unit you can always ord
163. hearing aid testing The 7000 Test System is the long awaited successor to the 6500 CX the analyzer that arguably has become the standard by which all other hearing aid test equipment is measured The 7000 Test System has many design improvements including a high resolu tion color display a flexible and easy to use interface and built in help screens Throughout the design process of the 7000 Test System the engineers at Frye Electronics have followed two important mantras Flexibility and Usability We wanted all the features of the existing 6500 CX system in a new package that was easier to use and easier to upgrade We are confident that the 7000 Test System is a success on both counts 1 1 History The 6500 CX has been one of the fastest and most accurate hearing aid analyz ers in the industry Since its introduction in 1985 at the International Audiology Congress in Prague Czechoslovakia it has evolved through three model num bers the original 6500 the 6500 C with color and the 6500 CX with a faster CPU These hardware upgrades and the software upgrades that went with them kept the 6500 analyzer current as hearing aid technology evolved The original 6500 operator interface was originally designed around a set of tests that were needed at the time of its introduction Linear and AGC hearing aids were tested for ANSI coupler performance and real ear tests were done to check on insertion gain performance Its Composite signal gave
164. hin 1 dB from 300 to 5000 Hz all others within All Modes M1950E only 3 dB after leveling CREST FACTOR Composite Mode Signal Less than 12 dB 4 to 1 ratio of peak to RMS value TELECOIL DRIVE 1 1 78 3 16 5 62 10 17 8 31 6 56 2 100 mA meter ANSI S3 22 1996 DIGITAL READOUT OF SOUND PRESSURE LEVEL Frequency Range 200 through 8000 Hz Amplitude Range From 0 through 150 dB 90 through 110 dB gain Resolution 0 1 dB Type True RMS Accuracy M1950E Within 1 dB plus or minus 1 digit from 300 to 5000 Hz within 2 dB plus or minus 1 digit for all other frequencies SPL Equivalent Input Noise Less than 50 dB RMS M1950E Noise Reduction Averages the measured signal in synchronism with the signal generator by the factor chosen Factors of 2 4 8 and16 available Random noise will be reduced by an amount equal to the inverse of the square root of the factor chosen BATTERY CURRENT MEASUREMENT Range 0 to 20 mA Accuracy Within 5 of reading plus or minus 0 01 mA Resolution 0 01 mA Voltages supplied 1 5 silver 1 3 zinc air See Appendix B ANSI S3 22 1996 Note The above accuracy applies only if the battery pill is disconnected during the level ing operation 174 FONIX 7000 Hearing Aid Analyzer SPECTRUM MODE AVERAGING Spectral off 2 4 8 and 16 HARMONIC DISTORTION ANALYZER Type Selectable for 2nd 3rd Total 2nd plus 3rd or none Resolution 0 1 percent Reading Percent
165. ibration instructions see Appendix B For instructions on leveling and saving leveling see Section 3 2 To open the Setup menu press MENU from the Opening screen General Operation 29 2 2 1 Saving and loading default settings All of the settings in the Setup menu described in Section 2 2 4 can be saved as default settings There are five possible setups so you can have five different configurations saved into the analyzer s permanent memory To save a user configuration 1 Open the Setup menu by pressing MENU from the Opening screen 2 Set up the Setup menu as desired All displayed settings will be saved so make sure that you check all fields See Section 2 2 4 for an explanation of each of them 3 Press F8 to open the Save Setup Defaults pop up menu 4 Use v a to select the desired setup number If you are only going to have one saved configuration use Setup 1 5 Use gt to complete the selection and close the pop up menu It will take a few seconds for the 7000 Test System to save the configuration The saved setup number will automatically be selected as the current user To load a setup configuration 1 Open the Setup menu by pressing MENU from the Opening screen 2 Press F7 to open the Load Setup Defaults pop up window 3 Use v a to select the desired setup number 4 Use gt to complete the selection and close the pop up menu Whenever a user configuration is saved or loaded that u
166. ids Also available 41 battery pill AA Sound Level Calibrator A portable self contained field type calibrator for calibrating the microphone amplifier It operates on one nine volt transistor battery Use with 14 mm to 1 adapter Calibration is traceable to the U S National Institute of Standards and Technology Conforms to ANSI 1 40 1984 and IEC 942 1988 10 FONIX 7000 Hearing Aid Analyzer Sound Chamber Stand A secure steel tube stand that improves sound isolation and brings the testing area of the test chamber to convenient table height Color matches the electronics module Sound Chamber Spring Damper Factory installed or Assembly Kit This spring assembly fits onto the back of the sound chamber making it easier to open the sound chamber lid Once the sound chamber is open past a cer tain point the user can release the lid and let the spring open it the rest of the way Great when performing repetitive coupler measurements FM Kit Facilitates coupler and real ear tests of FM systems The kit includes a telescoping floor stand with a test plat form and plenty of extra Fun Tak and a 6 inch 15 cm square foam pad for using the 2 cc coupler outside the test chamber Introduction and Setup 11 RECD Earphone Package Consists of one ER3A earphone with a 1 4 inch plug a 72 inch cable an assortment of ear tips a calibration certificate and a lapel clip This pack age is suit
167. igure 5 1 1A Setup for leveling Figure 5 1 1B Setup for aid testing equivalent substitution method 5 1 2 Setting up the hearing aid for ANSI The hearing aid controls must be set to conform with ANSI requirements for the test results to be valid 1 Set the controls on the aid except for the compression controls to give the greatest possible output and gain 2 Set the aid for the widest frequency response range 110 FONIX 7000 Hearing Aid Analyzer 5 6 For ANSI 87 and ANSI 96 set AGC aids to achieve the greatest possible compression or as otherwise specified by the manufacturer For ANSI 03 set AGC aids to have the most minimum compression possible or as otherwise specified by the manufacturer Put the hearing aid in test mode if applicable All noise suppression and feedback cancellation features should be turned off Set the gain control of the aid to the full on position Set the aid up in the sound chamber as described in Section 3 3 5 1 3 Setting up the analyzer for ANSI 1 2 Press F3 in the Opening screen to enter the ANSI S3 22 selection screen Press F1 to select ANSI 87 F2 to select ANSI 96 or F3 to select ANSI 03 The operation of these three tests is very similar Use F1 to select LEFT or RIGHT ear Use F2 to select the aid type LINEAR AGC or ADAPTIVE AGC Press F2 Use v a to choose the selection Press gt to complete the selection and close the pop up m
168. imilar display Here is an explanation of the ANSI 03 results Figure 5 1 6 S R TOT A D OSPL 90 curve Full on gain frequency sweep taken at 90 dB SPL RESP 60 curve Reference test gain frequency sweep taken at 60 dB SPL SPLITS curve Frequency response of the telecoil Aid type selected with F2 OSPL 90 MAX Amplitude and frequency of the maximum output of the aid OSPL 90 HFA SPA Three frequency response of the OSPL 90 curve HFA SPA FOG Full on gain three frequency average and the amplitude at which it was taken RTG Target Target reference test gain Automated Test Sequences 113 FOE TPE fk ALTEA AE ST Lele Bae oe n FORE a HFA 1000 0000 2800 Me TS GLS Mix LL a Freq Whist Sec B Som 70 a E ofa 150 8 on D en Peto Thid Heamred SRG d es irp Moise ZL at ii Reap Limit TRS tery ee E p d j g Fas 200 Hr FESS Ez 15 fihir d2 mA On On On Or On Fal aS i b St i 2 Setup tect parameters te couple microphone and HA coupler Presa START t begin beet Pross REM for local moru 4 y DIP ae LL lets af Los lee SSE Salit T dg Ereg Palaza Bekins fae t Lre Figure 5 1 6 ANSI 03 test results Frequency Response Screen 10 11 12 13 14 15 16 17 RTG Measured Measured reference test gain EQ Inp Noise Equivalent input noise measurement Resp Limit The response limit level is determined by taking the three fre quency average of the RESP 50 curve and
169. in is always measured at 50 dB SPL The ANSI 96 Simulated Telephone Sensitivity STS measurement is called Relative Simulated Equivalent Telephone Sensitivity RSETS in ANSI 03 5 1 1 Leveling for ANSI Before you run an ANSI test you should make sure the sound chamber is lev eled Even if the screen says that the chamber is leveled it is a good idea to periodically re level it to account for any differences that might have entered into the testing environment The ANSI standard requires that you do a special leveling that accounts for everything that will be in the chamber during the test For most practical office settings the leveling procedure explained in Section 3 2 is adequate 1 Place the dummy microphone a black cylinder provided when ANSI Option is ordered into the coupler Attach the hearing aid to the coupler in the way appropriate for the type of aid under test See Section 3 3 Automated Test Sequences 109 3 Position the hearing aid coupler assembly in the test chamber with the microphone of the aid at the reference point of the chamber 4 Place the test microphone as close as practical to the hearing aid micro phone 3 5 mm See Figure 5 1 1A 5 Close the lid of the sound chamber 6 Press the LEVEL button The sound chamber will level 7 Exchange the position of the dummy microphone and the test microphone and plug the battery pill into the battery voltage supply See Figure 5 1 1B F
170. including basic operation of the buttons screen navigation default settings source types printing and other information 2 1 Operation of buttons The general operation of the various buttons on the 7000 test system are described in this section This includes a description of the function buttons the arrow buttons and the Menu Help Reset Exit Level Feed Print Stop and Start buttons 2 1 1 Using the function keys The top row of buttons on the 7000 test system front panel consists of function keys labeled F1 through F8 The function of these keys changes from screen to screen according to the need of the screen The screen itself always shows the function of each of these buttons in a row of boxes along the bottom of the display This row is meant to represent the physical buttons on the front panel See Figure 2 1 Ponia 7000 Heming Aid Anaha Copyraght Sock fies Joos Joon Frys Tlectrontce Inc PO Bos 20 Tigard OF THER iA Pigs DLRA SE Oo Sa foe Fact S00 79 0109 mah biia fee eee Biure Veraion 1 8 Serie fume Go feat Leble Opt bores Probe DRC AD Wiehe OFS 205 TA Fi Cinp ler Emil wI HG Oe hae DEL Lhe It Eee Pe aa I EF Figure 2 1 Function key display 24 FONIX 7000 Hearing Aid Analyzer There are three basic uses of the function keys e To navigate from screen to screen e To toggle a selection To pop up a selection menu Navigation In the Opening scre
171. ings Press EXIT to close the local menu when the changes are complete In the Insertion Gain screen one insertion gain target is displayed in the top graph If the NAL NL1 fitting rule is selected this target adjusts according to the input level setting of the current selected curve That is if the amplitude of the source is set to 50 dB SPL the displayed target is for a 50 dB SPL input level If the clinician changes the input level to 80 dB SPL the target will decease showing the prescription for that input level When the unaided REUG 1 is selected the target curve uses the source settings for REAR 3 In the Real ear SPL screen up to three SPL targets are displayed on the screen When NAL NL1 is the selected fitting rule all three targets are automatically displayed They are labeled L M and H The L target is tied to the input level and speech weighting selected for REAR 2 The M target is tied to the input level and speech weighting selected for REAR 3 The H target is tied to the input level and speech weighting selected for REAR 4 That is if the clinican changes the input level or speech weighting of REAR 2 3 or 4 the corresponding SPL target will also adjust If a fitting rule other than NAL NL1 is selected only the M target is displayed which is tied to REAR 3 If desired the clinican can turn on the display of the other two targets using F3 but these targets will be linearly related to each other That is unlik
172. inkle and cause a paper jam The white plastic spring loaded back tension rod located at the back of the printer mechanism provides the required tension onto the outside of the paper roll No adjustment is required for proper operation Error Messages In the event that an error occurs when printing with the 7000 analyzer we ve included some error codes in the lower right corner of the screen that should help a FONIX technician troubleshoot the problem This section describes those error codes There are two categories of errors that can occur with the 7000 printer initial ization errors and printing errors Initialization errors occur only when the 7000 analyzer is first powered up this also initializes the printer Here are the printer initialization error codes General Operation 45 Init failed 0 No memory available for the converted screen buffer Init failed 1 No memory available for the label bitmap Init failed 2 Printer driver unresponsive Init failed 3 Version number from printer board is unreadable Errors that occur when actually printing have the following error codes Print failed 0 Print failed 1 Print failed 2 Print failed 3 Print failed 4 Disconnected No power Offline Head up Switching from internal to external printer failed Copying the label bitmap to the printer board has failed Converting of the screen to printable version has failed Copying the converted screen bitmap to
173. insertion gain is calculated as follows Frequency Hz Insertion Gain dB 250 1 2 HTL 500 1 2 HTL 750 1 2 HTL 1000 1 1 6 HTL 1500 1 1 5 HTL 2000 1 1 5 HTL 3000 1 1 7 HTL 4000 1 2 HTL 6000 1 2 HTL 8000 1 2 HTL Note Frequencies preceded by an asterisk are interpolated because the article does not reference them Fitting Formula Tables 191 1 3 1 2 2 3 Gain The 1 3 2 3 Insertion Gain Hearing Aid Selection Guide by Robert Libby Hearing Instruments vol 37 3 1986 Required insertion gain is calculated as follows FREQ INS GAIN INS GAIN INS GAIN Hz dB dB dB 2 3 rule 1 3 rule 1 2 rule 250 2 3HTL 5dB 1 3HTL 5dB 1 2 HTL 5 dB 500 2 3HTL 3dB 1 3 HTL 3dB 1 2 HTL 3 dB 750 2 3 HTL 1 3 HTL 1 2 HTL 1000 2 3 HTL 1 3 HTL 1 2 HTL 1500 2 3 HTL 1 3 HTL 1 2 HTL 2000 2 3 HTL 1 3 HTL 1 2 HTL 3000 2 3 HTL 1 3 HTL 1 2 HTL 4000 2 3 HTL 1 3 HTL 1 2 HTL 6000 2 3HTL 5dB 1 3HTL 5dB 1 2 HTL 5 dB 8000 2 3 HTL 5dB 1 3 HTL 5 qB 1 2 HTL 5 dB Note Frequencies marked by an asterisk are interpolated because the article does not reference them 192 FONIX 7000 Hearing Aid Analyzer Appendix F 193 Probe SPL Mode Description The Target IG is converted to the Target SPL in the following steps Conversion tables appear on the following pages Ae N e 5 Add the source level for Aided curve 2 Interpolate from 10 frequency to 79 frequency curve frame Add the AVG Unaided ear response REUR in T
174. ison of a BTE tested with an MZ coupler as opposed to a 2 cc coupler Table 3 7 Which is the Correct MZ Coupler to use TYPE OF AID COUPLER COMMENT BTE or EYEGLASS MZ 1 With custom earmold attached NOTE Vents must be plugged BODY M With snap on receivers use the MZ 2 without the Ear Level Hearing Aid Adapter attached MZ 2 Without custom earmold attached when a 3 mm horn earmold is planned use with the Ear Level Hearing Aid Adaptor that normally snaps onto the HA 2 2 cc coupler MZ 3 Without custom earmold attached when a con ventional 13 tubing earmold is planned attach a length of 13 tubing that corresponds to the length of the sound channel of the wearers earmold Z 2 Basic Sound Chamber Tests 91 FINTE THRE Fo AALTER Coad ee Late Eir Ura Character d tice Cure Cessio PHG Cor ME Ara hgt ra fe A at feeb 7 5 i HE ab S B15 OES ee CaF Chest 65 a oF fot 5 OF the BO 6 OFF Dab Bo a AF meb a OP Geb 9 OF Chet jen DP het Garie Dipjesh W baryes E a Levee bed Bisp Tore OFF Prejected Holts Abetone ai Lee LIUN to pelect beet ira Lae LEEJA to plet bim tore Fres START io run tect st selected curve Prep HHU for Local sera F cat FP FA Fe FE Left Car 3 W Figure 3 7 Comparison of the responses with the MZ and HA 2 couplers Curve 2 was measured with an MZ coupler and OES correction factors Curve 1 was measured using a standard 2 cc coupler 3 8 Automatic Testing
175. lect the desired source type and level for all the curves that you want to measure in the automated test sequence Press STOP after you have set up the last curve that you want to run in the test sequence For instance if you want to run only 4 curves press STOP after setting up CRV 4 This will make the analyzer pause after the four mea surements the remaining 6 available curves will not be run Use F6 to SAVE GROUP 1 2 or 3 if desired This will permanently save the automated sequence Basic Sound Chamber Tests 93 3 8 2 Loading a Saved Test Sequence It is not necessary to permanently save a custom test sequence but doing so allows you to bring it up in the Coupler screen at any time even if you ve turned off and on the analyzer Follow the directions in Section 3 8 1 to program and save your custom test sequence Then use F6 to LOAD GROUP 1 2 or 3 Choose the group you saved in Step 11 of Section 3 8 1 Press F6 Use v a to select the correct LOAD GROUP number Use gt to complete the selection and close the pop up menu The saved test sequence will now be loaded See Sections 3 8 3 and 3 8 4 for instructions on running the sequence fully automatically and semi automati cally Each user can save and load three custom test sequences There are three possible user profiles that can be saved See Section 2 2 1 3 8 3 Testing in Fully Automatic Mode The fully automatic mode will automatically run throu
176. ll help you trou bleshoot why some aids work better than other aids with monaural or binaural fittings 98 FONIX 7000 Hearing Aid Analyzer Technical details The digital processing delay measurement is taken by sending a short impulse from the sound chamber speaker to the hearing aid The 7000 Test System microphone collects information from the hearing aid for 20 milliseconds from the time the impulse is delivered This information is a series of numbers of varying amplitudes The 7000 Test System finds the maximum peak amplitude of the resulting information Since the impulse response of a hearing aid is not always simple the analyzer also checks for any peaks occurring before this maximum peak If a smaller peak exists and it has an amplitude of at least 50 of the maximum peak the time of the smaller peak will be considered the processing delay point Otherwise the time of the maximum peak will be considered the processing delay point The 7000 Test System delay is subtracted from this delay point in order to form the actual aid processing delay time The 7000 Test System delay is determined during the sound chamber leveling process The data collected in the digital processing delay measurement is displayed in graphical format as amplitude vs time A dotted vertical line is placed at the calculated delay point The numerical value is also displayed A second dotted vertical line shows the 7000 system delay for reference
177. lly advance the curve selection to REAR 2 but no measurement will be taken until the START button is pressed again Fully automatic mode is only available in the Real ear SPL screen It does not work in the Real ear Insertion Gain screen To activate fully automatic mode 1 Enter the Real ear SPL screen 2 Press MENU to open the local menu 3 Select Auto Test under Measurements v a Pressing START will jump to the beginning of the next section in the local menu 4 Choose Fully Auto using lt gt 5 Press EXIT to return to the Real ear SPL screen The analyzer will now be in Fully Automatic mode 6 4 7 Testing with a single tone or three frequency average It is sometimes useful to be able to look at a hearing aid s response to a single frequency or to a repeating three frequency sequence To measure with one of these selections 152 FONIX 7000 Hearing Aid Analyzer 1 Enter the Real ear Insertion Gain or Real ear SPL screen 2 Press MENU to enter the local menu 3 Select Static Tone under Source using v a Pressing START will jump ahead to the beginning of the next section in the local menu 4 Choose Single or Avg using lt gt If choosing Avg for a three frequency average use the Avg Freqs setting to select the highest frequency of the three frequency average See Section 2 3 1 1 for more details on the available fre quencies 5 Press EXIT to return to the measurement screen
178. m that Frye Electronics has always used to denote the aver aging that the analyzer makes when analyzing data to achieve a smooth curve This process is described in Section 2 3 1 2 and Section 2 3 2 1 Some high end digital hearings have digital signal processing features that try to detect noise in the environment and lower the gain at the frequencies in which it detects the noise Different manufacturers have different terminology for these features but they are most commonly called Speech Enhancement Noise Suppression or Noise Reduction Just keep in mind that these are two separate applications of the phrase Noise Reduction that mean two completely different things When you set the Noise Reduction on your FONIX 7000 test system you are setting the amount of aver aging the analyzer does When you set Noise Reduction on your hearing aid you are usually setting the amount of noise reduction that the hearing aid does 3 6 CIC Feature The CIC Feature is a way of performing a coupler test of a CIC hearing aid that more accurately reflects the real ear performance of that aid than a regular 2 cc coupler measurement It is not a way to check the manufacturing specifications of CIC hearing aids because those specifications are based upon 2 cc coupler measurements The CIC Feature consists of a CIC coupler 0 4 cc and software correction fac tors Both need to be used in order to correctly perform the measurement
179. ment is stopped the following changes occur The region between the minimum and maximum response curves is lightly shaded This indicates the entire region of the frequency response of the hearing aid over the time of the test The region around the average frequency response curve is darkly shad ed This region represents the standard deviation of the average response curve That is the area containing most of the frequency response curves measured during the test The real time measurement curve disappears Since this curve represents the latest measurement of an ever changing speech signal it is not rel evant to the overall test results displayed upon test completion See Figure 6 8 3 for an example of a completed Visible Speech measurement The curves consisting of Envelope 1 are labeled 1U Represents the maximum response per frequency over the time of the test 1u Represents the upper boundry of the standard deviation around the average frequency response 1M Represents the average frequency response of the test 11 Represents the lower boundry of the standard deviation around the average frequency response 1L Represents the minimum response per frequency over teh time of the test Other Visible Speech envelope measurements are labeled similarly using the number of the envelope 166 FONIX 7000 Hearing Aid Analyzer Ages Sagbe Diir ipet ite eme Ceo hering Prehobi Leal L amp T LLLLLL Lisi Tirip ED H
180. mulator coupler years ago to better approximate the real ear s impedance variation with frequency The ear s volume appears to get larger at lower frequencies Mahlon Burkhard at Industrial Research Products agreed with this approach especially when they built the KEMAR and designed an ear simulator that had impedance changes that matched the Zwislocki figures This ear simulator was later standardized by the publication of American National Standards Association standard S3 25 Another ear simulator that has similar characteristics was introduced in Europe a few years later by Bruel and Kjaer and is characterized in the standard IEC 711 Frye Electronics introduced a slightly different approach in the 1980 s when it came out with the INSITU option and later the OES option for its 5500 Z hearing aid Analyzer Realizing that ear simulators which contain frequency sensitive elements are somewhat fragile and can be damaged as they are handled in every day use Frye made a coupler which it labeled the MZ for Modified Zwislocki This coupler had a central volume very similar to the standardized Zwislocki but had no frequency sensitive elements Instead an analyzer program was used with the coupler to apply correction factors to the measured curves from the hearing aid so that the output was very similar to that which would be obtained if the aid were tested on a standardized ear simulator as built by Knowles or B amp K These software cor
181. n a pure tone fre quency sweep Automated Test Sequences 123 e Misc Start Delay The delay after the first tone is presented and before the first measurement is taken in the HFA SPA reference test gain equiv alent input noise and harmonic distortion measurements e Misc Meas Delay The delay between frequencies in the measurements mentioned above I O Start Delay The delay after the first tone is presented in the I O sweep and before the first measurement is taken e I O Meas Delay The delay between frequencies in the I O sweep Misc Settings 5 4 JIS Print Label Status of the printing label Choose ON or OFF e Printer Printer used for printouts Choose INTERNAL or EXTERNAL See Section 2 4 The JIS 2000 automated test sequence allows you to testing hearing aids accord ing to the Japanese Instrument Standard Press F7 from the Opening screen to enter the JIS test screen 5 4 1 Running JIS Follow these instructions to run a JIS automated test sequence 1 2 3 Press F7 from the Opening screen to enter the JIS test screen Use F1 to select the ear Use F2 to select the aid type Press F2 use v a to make your selection and gt to complete the selection and close the pop up menu Use F3 to select the amplitude of the full on gain measurement Use F4 to select the test frequency that you want to use Use F5 to select the type of coupler you are using for the test The 2 c
182. n distortion Basic Sound Chamber Tests 69 3 4 1 Signal Types The following signal types are available DIGITAL SPEECH A randomly interrupted composite signal designed to mimic speech This signal is for use with hearing aids with a noise reduc tion or speech enhancing feature that lowers the gain of the aid in the presence of a continuous signal such as the regular composite signal COMPOSITE A continuous real time speech weighted signal made up of 79 different frequencies The composite signal gives you the advantage of seeing how an aid responds to noise that more closely simulates speech and it lets you see immediately how the aid responds to any change in the amplitude of the signal TONE LONG A detailed frequency response curve that gives you infor mation on the amplification of 64 different pure tone frequencies between 200 and 8000 Hz TONE NORMAL A detailed frequency response curve that gives you information on the amplification of 43 different pure tone frequencies between 200 and 8000 Hz TONE FAST A continuous pure tone sweep that takes measurements at 16 different frequencies between 200 and 8000 Hz TONE SHORT A single pure tone sweep of 10 different frequencies 3 4 2 Running a Test Curve Ls Press MENU to make any necessary selections See Section 3 9 for details on available menu selections Set up the aid in the sound chamber as described in Section 3 3 and level if necessary
183. n the room 5 Pick a location that is as free of such sounds as possible Rotate the aid in all directions when looking for a good site Testing with the Sound Chamber Telecoil board Every 7000 sound chamber has a built in telecoil board that can be used for telecoil testing 1 Set up the hearing aid for testing in the usual way by connecting it to the appropriate coupler and inserting the measurement microphone 2 Enter the Coupler screen by pressing F1 in the Opening screen 3 Press MENU in the Coupler screen to open the local menu Set the TRANSDUCER to TELECOIL under Source Settings and press EXIT to close the local menu 4 Use F5 to set the Source Type to Composite 5 Press START to start a composite measurement 6 Look at the RMS OUT in the Curve Characteristics box This shows the cur rent output of the hearing aid to the magnetic field input 7 Position the hearing aid for maximum output For BTE hearing aids this usually occurs when the body of the aid is in a vertical position If neces sary use Fun Tak to help hold the aid in that position See Figure 3 4 10A Basic Sound Chamber Tests 79 Use v to change the intensity of the magnetic field The choices are OFF 1 00 1 78 3 16 5 62 10 0 17 8 31 6 56 2 and 100 mA m 31 6 is the default source intensity Press STOP to stop the measurement or continue to test as desired Figure 3 4 10A Testing with the Sound Chamber Telecoil
184. nd the horizontal lines representing another A Curve superimposed on a graph grid gives information about test results Hearing Aid Industry Conference Integral multiples of a pure tone The tone itself is the 1st harmonic or fundamental frequency twice the frequency of the tone is the 2nd harmonic three times the frequency of the tone is the 3rd harmonic etc The presence of harmonics in a reproduced signal that are not present in the original signal High frequency average according ANSI S3 22 1987 the averaged response at 1000 1600 and 2500 Hz Refers to the comparative augmentation of high frequency sound caused by the acoustic diffraction of low frequency sound by the head and pinna blending to produce a baffle Hearing Level The amount of decibels above audiometric zero at which a measured ear barely hears a sound Hertz Unit of frequency referring to cycles per second International Collegium of Rehabilitative Audiology International Electrotechnical Commission An international organization that sets standards for measurements Earphone whose transducer is joined to the ear by means of a tube attached to a foam eartip that is placed into the outer ear canal used in finding Real Ear to Coupler Difference RECD measurements A measure of the acoustic benefit of a hearing aid measured in a patient s ear The insertion gain is the difference at any particular frequency between the Aided Response and
185. neees 143 6 4 2 Measuring in the Real ear SPL screen cece cece eect ence ene eee n eee een teen eees 145 6 4 3 Measuring the Unaided Response REUG REUR 0 0 cc ccc eee cence eee eneee rererere 146 6 4 4 Measuring the Aided Response REAG REAR 0 ccc ccc ce cee eee eects eeneeneeeeeaaae 148 6 4 5 Working with prescription targets 2 0 0 0 cece cece cece e eee eee r eee e tent eee ee teen eees 150 6 4 6 Using Semi Auto and Fully Auto Mode 0 cece cece ence eee c eee e ene e ee en eee ea neces 151 6 4 7 Testing with a single tone or three frequency average 0 ccc cece cece eee ne eee e ee serere 151 64 8 Using the reference microphone cece eee e eee eee eee e ee beet tee bennett ee aaae 152 64 9 Viewing numerical curve data 0 cece cece e ee eee eee e een eect ene e ee en eee en ee es 152 6 4 10 Deleting and un displaying measurements 00 cece cece eee ee cece eee eee eee eneees 154 6 4 11 Using Smoothing in measurement curves 0 cece cece eee eect ee eee e eect eee teen eees 154 6 4 12 Using Output Limiting 0 ec EEA cee ee tence eee teen eee ee eee Eaa eee enes 156 64 13 Measuring the occlusion effect 0 0 c cece cece cece eee e eee nee e ee eee eee een eeeeeaaee 156 6 5 Digital Hearing Aids nera pa dees dente tan ies Sade deh hs E A oh Pee Leen etal 157 6 5 1 Using Digital Speechi aneen aE Sen RGSS a eases phe ned Le E E Sa
186. nformation performs some kind of algorithm to amplify the signal and turns it back into an analog sound wave for the ear to hear All of this calculat ing takes precious time it s never instantaneous The processing delay for some hearing aids is so slight that it is imperceptible to the human ear The process ing delay for other aids can extend to several milliseconds Why is this a problem Well if you fit a client monaurally with an aid with a significant digital processing delay that person might experience some confu sion because his unaided ear will be hearing sounds slightly faster than his aided ear Problems can also be predicted for patients with open canal fittings However if you fit the same patient with an occluded binaural set then both ears will be listening with the same delay and the confusion will be alleviated What is a significant delay At what magnitude does this delay start to affect speech intelligibility These are very good questions Unfortunately we don t have an answer at this time the field of digital hearing aids is still too young and there has not yet been enough research done to establish necessary guide lines A conservative approach would be to avoid monaural and open canal fit tings with digital aids that have delays of more than 1 to 2 milliseconds For now this measurement will give you more information about what s really going on in that digital hearing aid circuit and hopefully it wi
187. ng real ear measurements When this value is exceeded the measure ment will automatically stop and the source will turn off in order to protect the patient 32 FONIX 7000 Hearing Aid Analyzer NOISE RED TONE Pure tone noise reduction for real ear measurements See Section 2 3 1 2 NOISE RED COMP Composite noise reduction for real ear measurements See Section 2 3 2 1 SMOOTHING Status of smoothing which rounds off real ear curves and removes minor peaks Turn it ON or OFF RECD MODE Real ear to coupler difference used in real ear conversions such as HL to SPL When set to OFF the RECD graph and table are removed from the Audiogram Entry Screen and the average RECD is used CUSTOM ENTERED will let you enter RECD values previously measured and CUSTOM MEASURED will let you measure the RECD APPROACH The approach set in the local menu of the Real Ear Target screen When set to Gain the source type of REAR 5 in both the Real Ear Insertion Gain and Real Ear SPL screens will be set to the RESET SOURCE type When set to SPL the source type of this curve will be set to SHORT This is done for per forming a real ear saturation measurement at 90 dB SPL UNAIDED The type of unaided curve used in real ear measurements A selec tion of AVG will set the KEMAR average A selection of CUSTOM will use the patient s measured unaided response IG DISPLAY Type of display used in the Insertion Gain screen Choose between having th
188. ng screen Many settings measurements and test conditions are erased or returned to their default conditions with the push of this button Use EXIT instead of RESET to avoid the loss of data Brings up a pop up help window which tells you what func tions can be performed in the current screen Opens a local menu or the Default Settings menu Exits from the current screen leaving all settings measure ments and test conditions as is Levels the sound chamber or sound field speaker Advances the internal thermal paper feed Prints current screen Stops testing Starts testing The arrow keys perform different functions depending upon the screen and previous buttons pushed In a test situation they adjust the source amplitude and frequency If you press one of the function buttons to bring up a pop up menu they are used to scroll through the available options and make selections Power When green this LED indicates that the 7000 Test System is powered on Standby When green this LED indicates that the screensaver mode is engaged screensaver not available at this time Introduction and Setup 13 1 5 2 Rear Panel Layout The rear panel of the 7000 test system contains most of the external connec tions for the analyzer See Figure 1 5 2 for a diagram of the back panel Figure 1 5 2 Back panel 1 PRINTER
189. nox 0 35 Software Version 1 00 Serial Mumber OBOQOO Available Options Probe IEC ANSI YACorfig DES CPU ID 738040b Mic ID 479a3c EEROM ver 1 Bootloader ver 9 Options Ox00066902 Custom Ox00000000 Use FL F8 to enter a test screen Use MENU to change default settings and to calibrate the analyzer Use HELP or EXIT to close this window FL F2 Fa F4 F5 FE Fa User 1 Coupler Real ANSI 8 ANSI 32 ANSI 796 IEC 118 7 Enhanced 2003 03 09 Ear ISP 16122311 Figure 1 7 3B Software version location FONIX 7000 Hearing Aid Analyzer 1 7 4 Contacting the Factory If you have any questions regarding your instrument have your serial number and software version ready see Section 1 5 3 and contact us at Mailing address Shipping address Frye Electronics Inc Frye Electronics PO Box 23391 9826 SW Tigard St Tigard OR 97281 3391 Tigard OR 97223 USA USA Phone 800 547 8209 or 503 620 2722 Fax 503 639 0128 Email sales frye com sales questions Support frye com technical questions Service frye com repair questions 1 7 5 Warranty The 7000 test system and its accessories are guaranteed to be free of manufac turing defects that would prevent the product from meeting its specifications given in Appendix A of this manual for a period of one year from the date of purchase Chapter 2 23 General Operation This chapter describes the general operation of the 7000 test system
190. nt Turns it ON or OFE Misc Settings e Print Label Status of the printing label Choose ON or OFF e Printer Printer used for printouts Choose INTERNAL or EXTERNAL See Section 2 4 Chapter 6 127 Real Ear Measurements 6 1 Introduction The Real Ear Option gives you the capability to make probe microphone mea surements inside your client s ear You can e Input audiograms e Create targets e Perform insertion gain measurements e Perform SPL measurements e Perform Visible Speech measurements e Perform RECD measurements 6 1 1 Understanding the Real Ear Screens There are several different screens associated with real ear measurements You access each of these screens from the Real Ear Navigation screen shown in Figure 6 1 1 oS Se a FORE TRE 7 GL E Fral Le Foigation bossen Fonix 1000 Hearing ani fraler Prieta a fueli bag ba go be Dhil torii Prem IXI to return te Gperang Screen Figure 6 1 1 Real Ear Navigation Screen 128 FONIX 7000 Hearing Aid Analyzer These screens are e Audiogram Entry screen F1 e Target screen F2 Insertion Gain screen F3 e SPL screen F4 e Visible Speech F5 6 1 2 Navigating through the Real Ear Screens The Real Ear Navigation screen is the key to moving through the different real ear screens e To enter the Real Ear Navigation screen from the Opening screen press F2 To enter any of the real ear screens press the appropriate function key
191. nto the jack on the back of the 7000 test system labeled EARPHONE Insert the probe microphone into the client s ear as described in Section 6 2 3 See Figure 6 3 5C Insert the foam eartip connected to the insert earphone into the client s ear or attach the earphone directly to the client s earmold and insert the earmold into the client s ear See Figure 6 3 5D Press F2 from the Opening screen to enter the Real Ear Navigation screen 140 FONIX 7000 Hearing Aid Analyzer 5 Press F1 from the Real Ear Navigation screen to enter the Audiogram Entry screen 6 Press MENU from the Audiogram Entry screen to enter the local menu 7 Use v a to select RECD Mode under Misc and use lt gt to choose Custom Measured 8 Use v a to select RECD Transducer and use lt gt to choose ER3 Foam plug or custom earmold Probe mic Probe mic Figure 6 3 5C Insert probe microphone Figure 6 3 5D Insert foam eartip connected to insert microphone 9 Press EXIT to close the menu 10 Use F2 in the Audiogram Entry screen to select RECD You may have to push the button several times 11 Press START to take the measurement The results will appear in both graphical and numeric format See Figure 6 3 5 E If you have previously taken an RECD measurement you can input it with out measuring it by selecting RECD with F2 and using the arrow keys as you would to input HTL values
192. o calibrate the real ear probe and reference microphones 1 2 3 Follow steps 1 3 above to set up the 7000 Test System for calibration Insert the reference microphone into the adapter Turn on the sound level calibrator and look at the Ref Mic level in the Microphone Calibration window It should match the calibrated tone emit ted by the sound field calibrator This is usually 110 dB SPL or 114 dB SPL Check your calibrator for details If necessary adjust the gain of the reference microphone by using the Phillips head screwdriver to adjust the reference pot on the back of the remote module of the 7000 Test System Match the levels as close as possi ble If you are unable to adjust the gain of the microphone to the level emit ted by the calibrator you probably have a faulty microphone and should contact your local FONIX distributor or the Frye factory Calibration 179 Figure B 1 C Adjusting the reference pot with a Phillips head screwdriver 5 Remove the reference microphone from the adapter and turn off the calibra tor 6 Attach a new probe tube to the probe microphone 7 Thread the probe tube through the edged side of the probe microphone adapter so that the probe tube sticks out a couple of millimeters from the other end of the adapter See Figure B 1D Figure B 1D Calibrating the real ear probe microphone 8 Secure the probe tube in place by putting a dab of Fun Tak on the edged end of th
193. on The Occluded Ear Simulator OES Option consists of software correction fac tors and three special MZ couplers Together they allow you to simulate the data you would get with a standard ear simulator IEC 711 or Zwislocki coupler providing the hearing aid or mold being tested is not vented This should give you a coupler measurement that more accurately reflects a real ear response of an occluded ear than a 2 cc coupler Note The data results from the OES coupler will not be an exact duplicate for results performed with a Zwislocki coupler 90 FONIX 7000 Hearing Aid Analyzer To use the OES Option 1 E Er Attach the MZ coupler to the aid See Table 3 7 for details on choosing the correct MZ coupler Set up the hearing aid for testing as described in Section 3 3 Press MENU in the Coupler screen Highlight Coupler Type under Measurement Settings with v a Select MZ with lt gt Press EXIT Select the desired source type with F5 Press F5 Use v a to select the desired source type Press gt to complete the selection and close the pop up menu Select the desired source amplitude with v a Press START to perform the measurement You should see OES appear in the Curve Characteristics box in the Cor column of the selected curve If you are using the FAST COMPOSITE or DIG SPEECH signal press STOP to end the measurement once it has stabilized See Figure 3 7 for a compar
194. on the client s ear 2 Attach the reference microphone facing forward on the wedge of the earhook directly above the ear to be tested The reference microphone should be as close to the head as possible See Figure 6 2 2 3 Adjust the round Velcro pad on the wedge style earhook by turning it so that the inside pad fits firmly against the client s neck Figure 6 2 2 Placing the reference and probe microphones 130 FONIX 7000 Hearing Aid Analyzer 6 2 3 Inserting the probe tube There are several different methods used for properly inserting the probe tube Here are two easy methods Method 1 1 Place an unattached probe tube on a flat surface along with the client s earmold or shell 2 Place or hold the ear mold next to the probe tube so that the tube rests along the bottom of the canal part of the earmold with the tube extending at least 5 mm past the canal opening If there is a large vent you can slide the tube down the vent until it protrudes at least 5 mm past the canal open ing 3 Mark the probe tube where it meets the outside surface of the earmold with a marking pen See Figure 6 2 3A 4 Attach the probe tube to the body of the probe microphone 5 Attach the probe microphone to the round Velcro pad on the earhook 6 Insert the probe tube without the earmold or aid into the client s ear so that the mark is at the location where the bottom of the outer surface of the earmold will be once the
195. one stimulus of 1000 Hz at 60 dB SPL The current source selections are shown in a box below the mA Ampl graph on the right side of the screen You can e Change the source Type by using F3 Toggle between Puretone and Composite e Change the source Amplitude by using v a and e Change the source Frequency by using lt gt This setting is only avail able when the soucre type is set to Puretone with F3 102 FONIX 7000 Hearing Aid Analyzer 4 2 2 mA Freq The mA Freq test shows how much battery current the hearing aid drains when exposed to different frequencies By default it runs a 60 dB SPL LONG pure tone sweep The selected amplitude is displayed below the mA Ampl graph This amplitude can be changed by using v a Press START to run the test A few technical details about this test e The amplitude used for a test currently being displayed on the screen is shown above the mA Freq graph e The source type selected with F3 does NOT affect this test this test always uses a pure tone sweep e You can view the numerical data results by entering the local menu by pressing MENU and setting DATA GRAPH to DATA by using the arrow keys Close the local menu by using EXIT or MENU again Test results will now be shown in tabular data format e You can turn this test off by toggling the test status with F5 If the mA Freq graph is not displayed it will not be measured when Start is pressed e Use F1
196. ot performing a telecoil measurement skip to step 3B Otherwise just wait for the test sequence to complete 3B a Open the lid of the sound chamber b Switch the aid to telecoil mode Plug the telewand into the side of the sound chamber just above the cable that connects the sound chamber to the Frye box Hold the telewand over the aid as if it were the ear piece on a phone That is hold the telewand parallel to the body of a BTE or against the faceplate of an ITE It s also usually best to position the hearing aid verti cally to get the best telecoil response See Figure 5 1 4 Press START to measure the telecoil response The analyzer will pause after the telecoil measurements are complete Return the aid to the normal microphone mode set the AGC controls to max ANSI 03 and AGC aids only reposition the hearing aid in the sound chamber close the lid and press START to complete the test sequence If you re running an ANSI 03 test of an AGC aid without a telecoil measure ment the analyzer will run several measurements and then pause to allow you to set the AGC controls of your aid to maximum Do so close the lid of the chamber and press START to complete the test sequence Figure 5 1 4 Holding telewand parallel to the body of a BTE 112 FONIX 7000 Hearing Aid Analyzer 5 1 5 Running an ANSI 87 Test After leveling the sound chamber as described in Section 5 1 1 setting up th
197. ould probably be turned off for compression aids with a knee point below 60 dB SPL e Option Option used with the test sequence This can be CIC which adds CIC correction factors make sure to use the CIC coupler with this option or VA CORFIG which includes software correction factors designed by the VA to produce a more realistic response curve than the normal ANSI response curve ANSI Settings e OSPL90 Sweep Start Delay The delay after the first tone is presented in the OSPL9O sweep and before the first measurement is taken 116 FONIX 7000 Hearing Aid Analyzer OSPL90 Sweep Meas Delay The delay between frequencies in the OSPL90 sweep Res Crv Sweep Start Delay The delay after the first tone is presented in the response curve at 50 or 60 dB SPL sweep and before the first mea surement is taken Res Crv Sweep Meas Delay The delay between frequencies in the response curve at 50 or 60 dB SPL sweep Misc Start Delay The delay after the first tone is presented and before the first measurement is taken in the HFA SPA reference test gain equiv alent input noise and harmonic distortion measurements Misc Meas Delay The delay between frequencies in the measurements mentioned above Note ANSI 87 combines the OSPL90 and Res Crv delays into the Sweep Start delay settings AGC Settings The purpose of the following settings is identical for each I O frequency AGC frequency Status of the
198. produced with the OES Option will not be an exact duplication of the results produced with a Zwislocki coupler VA CORFIG The VA CORFIG Option supplies a frequency response in the ANSI test sequence that includes correction factors that make the measurement closer to a real ear response These correction factors were developed by the United States Veterans Administration 4 FONIX 7000 Hearing Aid Analyzer 1 4 Accessories The following are accessories that are standard and optional on your FONIX 7000 hearing aid analyzer 14 1 Standard Accessories The following accessories come standard with each 7000 test system Coupler Microphone M1950E 14 mm pressure type electret instru mentation microphone Note Older 7000 analyzers may use the M1750E microphone HA 1 2 cc Coupler Dimensions per ANSI S3 7 for testing in the ear aids canal aids and aids fit ted with earmolds HA 2 2 cc Coupler Dimensions per ANSI S3 7 for testing behind the ear aids eyeglass aids and body aids Ear Level Adapter BTE Snaps into the 1 4 6 35 mm diameter cavity of the HA 2 and MZ 2 couplers Equipped with a 0 6 15 mm length of 0 076 1 93 mm ID tubing the adapter allows ANSI S3 22 specified connection of an ear level aid to the coupler Introduction and Setup Other Standard Accessories Thermal Paper RS232 Cable Dummy Microphone for testing to ANSI specifications Operator s Manual Microphone
199. quencies being amplified more than they are under normal use conditions A sound generator that produces a tone at a precisely controlled frequency and amplitude Computer Hearing Aid Program A program designed to interface with Fonix instruments in order to make the storage of information in computer files quick and easy The current version is known as WinCHAP Completely in the Canal Coupler A coupler designed to better handle the unique acoustic qualities of completely in the canal aids Included with the CIC Coupler is internal software which provides corrections to increase the accuracy of CIC measurements even further The major part of the acoustic effect of the pinna contributing significant energy to the External Ear Effect in the region of 5000 Hz Abbreviation for telephone pickup coil The FONIX test signal consisting of 79 pure tones presented simultaneously A hearing aid prescription formula used to convert an audiogram to a target curve Common formulas are the NAL Berger POGO and the 1 2 1 3 or 2 3 Gain rules Coupler Response for Flat Insertion Gain or correction figure This is the transformation that when added to a target insertion gain response will give the target coupler response The inverse of CORFIG is GIFROC A device that connects a test microphone to a hearing aid to provide an accurate testing situation Contralateral Routing of Signal A type of hearing aid that uses a
200. r Screen F6 F7 IEC JIS F1 F2 Audiogram Target Ineemion Entry Edit Gain F4 d e Speech Attack amp Release F1 F2 Battery Coupler Test VO A Fi ANSI 87 ANSI 96 ANSI 03 Figure 2 1 2 Navigation Flow Chart FONIX 7000 Hearing Aid Analyzer 2 1 3 Using the pop up help windows Each operational screen on the 7000 test system has a local help window designed to give you a basic operational overview of the current screen In gen eral these help windows tell you what each button does in the current screen See Figure 2 1 3 for an example To clear the help window press HELP again or the EXIT button SPLE FONIX TYPE 7000 ANALYZER BE Coupler Left Ear BOR Curve Characteristics Cury lt Source gt RMS Cor NR zf Name Type Trans Amp Out BER CUF Chamb 60 97 8 4k CLe CFP Chamb 60 BOE eo ghee CIZ CEP hanh Ef ik Help Hindow Standard Usage in manual mode SOF Select ear with F1 Select curve with F2 Change source type with F5 pop Change source level with Up Down buttons Press Start to measure the curve Press Stop to end the test aof ighted _ Source Type Abbreviations 9 First characters aret P Puretone C Composite or I Digital Speech 20 If the first character is Fi ay Second characters aret N Normal F Fast or S Short sweep If the first character is C or Ds 10h Second characters a
201. r EXTERNAL 4 Press EXIT to return to the measurement screen General Operation 43 To set the default printer and or to set the external printer language and color choice use the Setup menu Press MENU from the Opening screen to open the Setup menu Use v a to select Printer under General Use gt to make your printer selection INTERNAL or EXTERNAL Use the arrow keys to make the desired selections for EXT PRNT COLOR and EXT PRNT LANGUAGE if you are using an external printer Press MENU to close the menu Press F8 to save the setting as the user default This will also save all the other selections in the Setup menu Ae wo N e on 7 Press EXIT to return to the Opening screen 2 4 2 Adding a label A label with your printout allows you to record useful information about the client and hearing aid to go along with the test results See Figure 2 4 2 If you are in the middle of a test and you want to add a label for the printout in the local screen without changing the default setting 1 Press MENU from the measurement screen to open a local menu 2 Use v a to select Print Label under Misc Settings You may want to use the START button to skip ahead sections in the local menu 3 Use gt to turn the label ON 4 Press EXIT to return to the measurement screen Any printout will now include a label until your turn off the analyzer Date 2008 08 29 16 49 Mode lee an Seri
202. r black amp white you will need to use the Setup menu General Operation 49 2 4 7 Putting multiple screens on a page When printing with an external printer it is possible to save paper by putting two screen prints on one piece of paper This is done by printing the first screen on one half of the paper and leaving the paper halfway through the external printer until you choose to print the second screen To do this 1 2 2 5 Display amp Data This section describes the Curve Characteristics Box that is common to every External Press EXIT to return to the Opening screen Press MENU in the Opening screen to open the Setup menu Go to the screen you want to print on the first half of the page Go to the screen you want to print on the second half of the paper or run another test Press PRINT to print the second screen and feed the paper the rest of the way through the printer Note if you decide you don t want to take a second screen shot press FEED to feed the second half of the paper through the external pritner without printing Change Ext Prnt Scrns Page under General to 2 Make sure Printer is set to Press PRINT to print the screen onto the first half of the paper The paper will remain halfway through the external printer measurement screen and the data display that shows the numerical data of the response curves in the Coupler screen and the real ear measurement screens
203. r details on the leveling status and troubleshooting the level ing process 6 2 5 Setting up Body Aids The setup below is recommended for Body aids REFERENCE MIC REFERENCE MIC PROBE MIC SPEAKER HEAD HIGH PROBE MIC ES SPEAKER whence ODY AID FACING FORWARD Figure 6 2 5 Setting up a body aid for real ear testing 6 3 Real Ear Targets This section describes how to enter a real ear audiogram enter or measure a real ear to coupler difference RECD and create or modify a real ear target 6 3 1 Entering an Audiogram 1 Enter the Real Ear Navigation screen by pressing F2 from the Opening screen or EXIT from any real ear screen 2 Press F1 to enter the Audiogram Entry screen See Figure 6 3 1 3 Press F1 to select the desired ear 136 FONIX 7000 Hearing Aid Analyzer 4 Make sure HTL is selected above F2 You should see a cursor in the HTL column for the selected ear in the middle of the display If the cursor is in a different column press F2 to select HTL 5 Use the arrow keys to input the client s HTL hearing threshold level val ues Use lt gt to input the amplitude Use v a to select the frequency 6 Use F5 to select the client s age Press F5 Use v a to make the selec tion Press gt to complete the selection and close the pop up window 7 Press F2 to select UCL if you would like to input your client s measured uncomfortable levels Press F3 i
204. r the RESET button is pressed See Section 2 2 1 and 2 2 4 Other sub section for details 3 1 The Coupler Screen Display The display of the Main Coupler Screen varies depending upon whether you have chosen a pure tone source or a composite including Digital Speech source 3 1 1 Viewing a Pure tone Display Coupler Left Ear FOMIX TYPE 7000 ANALYZER a Curve Characteristics Cury lt Source gt RMS Cor NR Name Type Trans Amp Out BBE PHP Chamb OFF CL2 CHP Chamb CL3 CFP Chamb D CL4 CFP Chamb CLo CFP Chamb CLE CFP Chamb CL CFP Chamb CLS CFP Chamb CLO CFP Chamb CLX CFP Chamb Source Puretone 1 12 Octave D Chamber Leveled Noise Reduction OFF Maxt 102 9 dB SPL Avgi 99 5 dB SPL 1 tkHz 2 8 Source Heasuremertt Ampl Freq Ampl Dist dBSPL Hz dBSPL D 65 1000 Use UP DOWN to select test level Use M1750E and HA coupler Press START to run test at selected curve Press MENU for local menu F2 FE Fa 1 DFF OFF Prev 2003 05 29 Select Cru Select On Off Curvets Src Select Auto Test Toggle 12 53 57 Figure 3 1 1 Coupler Screen with pure tone source 56 FONIX 7000 Hearing Aid Analyzer Refer to Figure 3 1 1 for the following explanation of the graphical display 1 SN E lS Type of display This will be either dB SPL coupler output or dB Gain cou pler gain Selected ear Curve Characteristics box See Section 2
205. rections work well for most regions in the frequency response of the aid In low frequency areas up to about 1500 Hz if the aid has a response peak that is influenced by the volume of the cavity the peak will be slightly higher in amplitude and slightly higher in frequency than that peak would be if the aid were measured in a standardized ear simulator The CIC hearing aid is not usually affected by this problem The Need for a CIC Coupler The introduction of the CIC hearing aids has made it desirable to be able to test them with a coupler that more closely approximates the actual volume and frequency response characteristics of the real ear The CIC aid fits so close to the tympanic membrane TM of the ear that the volume of the cavity is reduced greatly and the aid produces a significant amount more gain Further its response can be expected to be substantially influenced by the frequency dependent impedance variations of the TM Frye Electronics felt that the use of a CIC coupler with a proper response cor rection would give better data to a hearing professional than the use of the stan dard 2 cc coupler or even a Zwislocki ear simulator when attempting to produce 186 FONIX 7000 Hearing Aid Analyzer a good hearing aid fitting It also felt that the approach taken in the use of the MZ coupler has been well accepted by professionals throughout the world and that the new CIC coupler should use a similar approach with response correc
206. rement In order to directly compare the unaided response to the aided response in an SPL graph it is important that the speech weighting and input level of the input signal are the same for both the unaided and the aided response For example if the unaided response is measured at 65 dB SPL it is difficult to directly com pare it to the measured aided response at 80 dB SPL when viewing the data in an SPL graph However a direct comparison of the unaided and aided response can be desirable in ensuring the hearing aid amplifies above the unaided response Therefore the 7000 Hearing Aid Test System has an REUR Auto Adjust feature When the REUR Auto Adjust is enabled the unaided response is automatically adjusted according to the speech weighting and input level of the selected aided measurement This allows the clinician to measure the unaided response at one level and directly compare it to aided measurement curves measured at another level To enable the REUR Auto Adjust press MENU in the Real ear Insertion Gain or Real ear SPL screen to open the local menu Use the arrow keys to select REUR Auto Adjust under Measurements and change its setting to On The REUR Auto Adjust is automatically enabled when Unaided is set to Average in the local menu 6 4 4 Measuring the Aided Response REAG REAR Up to four different aided curves can be measured and displayed together in the Real ear Insertion Gain and Real ear SPL screens Any m
207. rement 3 4 3 Example Following the instructions above run 4 Gain curves using amplitudes 50 60 70 and 80 dB SPL Use a signal source of COMPOSITE This scenario will provide you with a family of curves Whenever the curves sit on top of each other the gain of the aid is the same for the amplitudes of those curves This indicates the aid is running linearly If the curves provide progres sively less gain as the input rises then the aid has some sort of compression circuit Figure 3 4 3 shows two examples of this scenario Here are the steps 1 Look at the graph If it has a display of SPL press MENU and change the DISPLAY from SPL to GAIN using the arrow keys Press EXIT to return to the Coupler screen Use F2 to select CRV 1 Press F2 Use v a to select CRV1 Press gt to complete the selection and close the pop up window Use v a to select a source level of 50 dB SPL Use F5 to select a source type of COMPOSITE Press START to run the first measurement Press STOP when the mea surement has stabilized Basic Sound Chamber Tests 71 10 11 12 13 14 Use F2 to select CRV 2 Use a to select a source level of 60 dB SPL Press START to run the second measurement Press STOP when the mea surement has stabilized Use F2 to select CRV 3 Use a to select a source level of 70 dB SPL Press START to run the third measurement Press STOP when the mea surement
208. response curves To do this Automated Test Sequences 115 AeA wo N e Run the ANSI test sequence Press F6 Use v to select Store Crvs Coup if necessary Press gt to store the curves and close the menu The following is a list of where the curves are stored in the Coupler screen Any previous measure ments stored in those curve locations will be overwritten e SPLITS CRV 4 e VA CORFIG CRV 5 e Response CRV 6 e OSPL90 CRV 7 Press EXIT and F1 to enter the Coupler screen and view the ANSI response curves 5 1 9 Explaining the Menu Settings The following is an explanation of all the ANSI menu selections Measurement Settings e Noise Red Tone The amount of noise reduction used in the pure tone measurements See Section 2 3 1 2 for details e Battery Meas The status of the battery current measurement Turns it ON or OFF Battery pill required for this measurement e Battery Size Size of the battery for the hearing aid being tested e 12 dB Dist The status of the 12 dB harmonic distortion rule When mea suring harmonic distortion if the amplitude of the response at the sec ond harmonic of the frequency being measured is 12 dB greater than the amplitude of that primary frequency the harmonic distortion measure ment should be ignored at the primary frequency Turn this rule ON or OFE e Equiv Noise Test Status of the EIN measurement Turns it ON or OFF In ANSI 87 and ANSI 96 this sh
209. ret F Flat weighted W Speech weighted or S Spectrum Press HELP to close the HELP window Fi F2 F3 F4 F5 FE F7 Fe Left Ear 1 Curve Delete Composite OFF OFF Prev 2003 05 29 Select Cry Select On Off Curvets Src Select Auto Test Toggle 12512434 Figure 2 1 3 Pop up help window General Operation 27 2 1 4 Using the local menus Pressing the MENU button will pop up a local menu that like the help win dow will be overlaid on your current screen Each local menu contains selec tions specific to your current screen For instance when you are in the Coupler screen the local menu will contain only selections specific to coupler measure ments See Figure 2 1 4 for an example of a local menu FOREN THRE Fite AL YZER t Late Lar i Dre Dhar ited vA f Gource PE Cor AR Dime lay ae ireu Si Sat hiney ll Te Suandard To ra A WA S Graph alp hraa Sapna Start Dila 100 Seep Feat Delay a 2 Corse Lobel LettRiget Hoos Seert Delay naa 22 Mise Mesa Deli Pai esque eet rege Coupler Te a Pace Senn reed Biekortion Tat Laotian Fea Heise Rec Tore WF Faitey face Bcd ew Pech icap al Frist Label Frisia Treernal Ll Det paled F Bario SHUL ire Dipu Iram Cheer Satie Tie Of Bise Tort ieee O Comptdd ie Tut Giai oposite Filter Plat r be LTO ti jola iua itea Priit MENU o EXIT ba anil Che aii
210. revert to its leveled status after it has been turned off and on again 3 2 3 Saving the leveling information To save the sound chamber leveling so that you won t have to re level the sound chamber the next time the analyzer is turned on Follow the instructions in Section 3 2 1 to level the sound chamber Press MENU from the Opening screen This will open the Setup menu Press F5 to save the chamber leveling Ae N e Press EXIT to return to the Opening screen 3 3 Hearing Aid Setup Coupler types and methods for attaching them to hearing aids are described in this chapter This includes a description of the HA 1 coupler HA 2 coupler and the ear level adapter used with the HA 2 coupler Basic Sound Chamber Tests 59 3 3 1 Explaining the Coupler Types The HA 1 direct access coupler is used to test in the ear and canal aids and aids with molds connected Figure 3 3 1B shows the direct access coupler The sound bore of the aid is sealed directly to the 2 cc cavity of this coupler with Fun Tak putty provided with the instrument The HA 2 coupler approximates the human ear with an earmold attached See Figure 3 3 1A Note the tube that simulates the earmold Button type receivers connect directly to this coupler Behind the Ear BTE hearing aids connect to this coupler by means of an ear level adapter as shown in Figures 3 3 1C OUTER O RING ny INNER O RING MICROPHONE O RING Figure
211. rking wall outlet c Check the fuse in the power entry module CRT VGA LCD display monitor is not working a Check the ON switch b Make sure the power cable is plugged into working wall outlet c Check the monitor brightness and contrast controls d Check the cable between the monitor and instrument e Make sure nothing is resting against the probe keyboard or main panel and causing a stuck button Test Chamber Problems Test Chamber Microphone does not Level Check your mic calibration See Appendix B Is the mic properly plugged into the instrument Are all connections clean and tight Is the mic head element screwed on tightly Is the mic cable loose broken cut worn or frayed m gt oaQaoo p Make sure everything is out of the test chamber except the mic when trying to level Open the test chamber and listen for the leveling signal h Check the test chamber cable connections ga i Is there an unusual amount of background noise in the test area air con ditioning heating fans street noise people talking computer fans etc 184 FONIX 7000 Hearing Aid Analyzer Coupler Problems 1 HA 2 Coupler BTE adapter tubing is missing loose or cracked Replace with 13 thickwall tubing Length 0 6 15mm 2 Test microphone is difficult to get into coupler or the ear level adapter does not easily seal to the other end of the coupler Lubricate the black O ring with light petrole
212. rmines standards for testing equipment A section number and date year following the initials ANSI designate the standard referred to A false reading Automatic Signal Processing A feature on a hearing aid intended to overcome the effects of background noise making it easier to understand speech when noise is present The term ASP is not standardized and may refer to various forms of signal processing Usually however ASP refers to a reduction in low frequency gain in the presence of ongoing background noise Short for Averaging An option on the 7000 Test System that uses three pure tones and averages them for the screen display A battery simulator that conforms to the size and shape of a battery used in a hearing aid It connects to the Battery Voltage Supply providing the proper voltage to the hearing aid A prescription formula developed by Kenneth W Berger The background frequency acting as noise when using the Digital Speech in Noise test The amplitude of the background frequency used in the Digital Speech in Noise test 198 FONIX 7000 Hearing Aid Analyzer BICROS BLOOMING EFFECT CALIBRATOR CHAP CIC COUPLER CONCHA RESONANCE COIL COMPOSITE CONVERSION FORMULA CORFIG COUPLER CROS CRT CURVE A CROS aid that has two microphones one at each ear sending both signals to one ear A characteristic of pure tone testing at high levels that typically shows low fre
213. roperly controlled across the frequency spectrum See Figure 6 2 4 You must re level the sound field for every client and every ear 134 FONIX 7000 Hearing Aid Analyzer FONIX TYPE 7000 ANALYZER Real Ear Insertion Gain Curve Characteristics Curve lt Source gt RHS NR Name Titl Type Trans dB Gut JEE REUG CG S F 55 64 4 4X PL2 REAG PMP 5 F REAG PHP S F REAG PHP S F REAG PSP 5 F REIG REIG pi REIG PLI REIG Aa TARG Source Composita ANSI Weighted Sound Field Leveled Projected Noise Reduction 4 Reference Mict On Smoothing Log Qut Limit 120 dBSPL Target Formula NAL RP Source 55 dBSPL 5 1 kHz 2 4 8 Use UPTOWN to select test level Use Probe and Reference microphones Press START to run test at selected curve Press MENU for local menu F1 F F3 User 1 Left Ear REUR 1 Curve Curve Composite 2003 08 12 F4 F5 FE FF Select Crv Select On OFF Actions Sre Select 16257206 Figure 6 2 4 Leveling the sound field speaker Follow the instructions found in Sections 6 2 1 and 6 2 2 to position the client sound field speaker and microphones for testing Only the larger reference microphone is used for leveling However to speed things up and ensure the client is in the same position for leveling as he is for measuring it is recommended that you insert the probe microphone tube in the client s ear described in Section 6 2 3 before
214. rophone and insert ear phone are type B applied parts according to IEC 60601 1 Read the accompanying documents Please read this manual before operating the 7000 test system A separate maintenance manual exists for the 7000 test system If you wish to obtain a maintenance manual please contact Frye Electronics Inc or your Frye representative This symbol indicates that Frye Electronics Inc conforms to the Medical Device Directive 93 42 EEC Any attached video monitor external printer or external computer should also have a CE mark in order for the 7000 test system to remain compliant 0086 H Replace fuses only with the same type and rating 1 5 3 Safety Safety Classification for IEC 60601 1 Type of protection against electric shock Class I Degree of protection against electric shock Type B Protection against harmful ingress of water Ordinary Mode of operation Continuous The 7000 does not require sterilization or disinfection Warning This equipment is not suitable for use in the presence of flammable anaesthetic mixture with air or with oxygen or nitrous oxide Introduction and Setup 15 Connection of peripheral equipment to the 7000 Compliance with IEC 60601 1 1 Safety requirements for medical electrical sys tems must be determined on a case by case basis All electrical equipment attached to the 7000 such as video monitors computer equipment etc must at a minimum meet one of the following conditions
215. rt all safety related con cerns to our authorized representative Siemens Hearing Instruments Ltd Alexandra House Newton Road Manor Royal Crawley West Sussex RH109TT ENGLAND 16 FONIX 7000 Hearing Aid Analyzer Otherwise please report all safety related concerns to the Frye factory Frye Electronics Inc 9826 SW Tigard St Tigard OR 97223 Ph 503 620 2722 or 800 547 8209 Fax 503 639 0128 email support frye com sales frye com 50 13485 Frye Electronics Inc is a Registered Firm of British Standards OQ Institution and we conform to the ISO 13485 standard FM 77405 1 6 Setup This section describes the unpacking and setup of the 7000 test system A description of the front and back panels is also included 1 6 1 Unpacking the FONIX 7000 Remove the FONIX 7000 test system from the shipping cartons Store the ship ping cartons in a dry place so that they can be used again in the event that the unit must be returned to the factory for repair or upgrade See Figure 1 6 1 for a picture of the 7000 test system and a labeling of its basic components Remote Module wath Aiea Ear Option Figure 1 6 1 Caption The 7000 Test system Introduction and Setup 17 1 6 2 Locating and arranging the 7000 test system Locate the 7000 test system in a moderately quiet area such as a private office or laboratory In order for test results to reliably conform to specifications the ambient noi
216. ry easily 1 2 Press MENU from the Coupler screen Select Distortion under Measurement Settings using the v a buttons Select the distortion type desired by using the lt gt buttons The selections are 2ND Distortion present at the second harmonics or twice the presented frequency Basic Sound Chamber Tests 75 3RD Distortion present at the third harmonics or three times the presented frequency TOTAL Distortion present at the second and third harmonics 4 Press EXIT Use F5 to select a signal type of TONE NORMAL Press F5 Use v a to select TONE NORMAL Use gt to complete the selection and close the pop up menu 6 Press START to run normal frequency sweep After running a normal sweep the harmonic distortion data will appear on the measurement graph as a series of red bars The scale for the bars is on the right side of the graph In general you should ignore the harmonic distortion measurement when the amplitude of the response curve measurement at the second harmonic is more than 12 dB greater than the amplitude at the first harmonic This is called the 12 dB rule and is part of the ANSI S3 22 standard pel THRE FOGG WHALTZER pape Lae Car urei Coe ite rd dh Geurce FE Cor A Dirie Puriri LAL ebs Chatar r Leala hiie Fecuetion Zi Him E E di SPL na BLE di SPL liie UPSTORM to palaci bart beuel Lee coupler aig id HA cote Pridi START to u
217. s measure ment 3 Insert the hearing aid in the client s ear being careful not the move the probe tube The hearing aid can be turned on or off 4 Enter the Insertion Gain screen by pressing F3 from the Real Ear Navigation screen 5 Use F2 to select the REUR 1 curve Press F2 Use v a to select REUR 1 Press gt to complete the selection and close the pop up menu 6 Use F5 to select a source type of COMPOSITE Real Ear Measurements 157 7 Press v repeatedly until the chosen source is OFF 8 Press START to start the measurement 9 Instruct your client to sustain the vowel sound eee 10 Press STOP while the eee is still sounding and the curve has stabilized The client can now stop vocalizing 11 Look at the amplification in the low frequencies If it seems high you may consider adjusting the vent to a more open condition to prevent occlusion effect discomfort 12 Press F2 to select the REAR 2 curve Make sure that COMPOSITE is the selected source type and that the source is turned OFF Use F5 and v to make these selections if necessary 13 Press START to start a second measurement 14 Ask the client to sustain an eee sound again Press STOP during the vocalization when the measurement has stabilized You can then tell your client to stop 15 Examine the REAR 2 curve in the lower graph and the corresponding REIR curve in the upper graph REAR 2 is a measur
218. se mechanical vibrations electrical or magnetic fields must not affect test results by more than 0 5 dB ANSI S3 22 Low noise acoustic condi tions as found in sound treated rooms and booths are recommended but not necessary Locate the main module near the sound chamber The video monitor may be placed on top of the main module If your 7000 has the Real ear Option further consideration needs to be given to the placement of the sound field speaker The speaker should be placed in a manner in which the sound will not reflect off walls chairs tables or other objects Such sound reflections could negatively affect test results 1 6 3 Connecting the Main Module amp Components Connect the main module to the system components as follows see Figure 1 6 3 1 Connect the video monitor to the jack marked Monitor on the back of the main module Tighten the screws on the connector to secure the connection 2 Plug the M1950E microphone into the connector marked Microphone located on the back of the main module 3 Connect the sound chamber cable into the plug marked sound chamber on the back of the main module Plug the other end of the cable into the sound chamber This cable provides all the connections necessary for operating the internal loudspeaker telecoil and battery voltage supply of the 7020 test chamber Tighten the screws of the plug at each end of the cable to secure the connection 4 Plug the power
219. section They are the same for CROS and BICROS hearing aids When a CROS aid has been prescribed to overcome a severe unilateral high fre quency loss you may want to ensure that inserting an open ear mold into the good ear has not significantly attenuated the acoustic transmission to the good ear Since this is a monaural measurement a 45 position of the loudspeaker is rec ommended Unaided Unoccluded Ear canal Response of good ear Set up the 7000 test system as follows e Reference microphone ON GOOD BAD e Sound field LEVELED EAR EAP e Unaided CUSTOM REFERENCE MIC e Reference microphone over pinna of good ear Pa e Probe microphone inside unoccluded PROBE MIC eA 42 ear canal of good ear e Loudspeaker at 45 toward good ear 12 inches from surface of head SPEAKER Aided Occluded Response of good ear Same setup as above except e Earmold in place in good ear e Hearing aid is turned off The difference curve labeled Insertion Gain on screen shows insertion loss if any caused by inserting the earmold into the good ear Appendix A 173 Specifications ACOUSTIC DRIVE SIGNAL Frequencies Composite 200 to 8000 Hz in 100 Hz intervals SINE 200 to 8000 Hz 1 12 oct nearest 100 Hz intervals Frequency Accuracy 1 Amplitute RMS 5 dB steps Chamber COMPOSITE 40 to 100 dBSPL SINE 40 to 100 dBSPL Sound Field COMPOSITE 40 to 90 dBSPL SINE 40 to 90 dBSPL Amplitude Accuracy Wit
220. selected frequency will be displayed on the screen below the Curve Characteristics Box 8 Press STOP when done with the measurement See Figure 3 5 3 for an example of using the bias signal at several different frequencies 3 5 4 Checking Noise Suppression When testing a digital hearing aid that is supposed to be programmed with a noise suppression or speech enhancement feature it is useful to make sure the feature is working correctly You can use a combination of Digital Speech and the Composite signal to test noise suppression 1 Look at the top left corner of the graph on the Coupler screen It should read dB GAIN If it reads dB SPL you will need to change the display to GAIN To do this a Press MENU from the Coupler screen to open the local menu b Use v a to select Display under Display Settings c Use lt gt to choose GAIN d Press EXIT to return to the Coupler screen Basic Sound Chamber Tests 87 10 11 Use F2 to select CRV 1 Press F2 Use v a to select CRV 1 Use gt to complete the selection and close the pop up menu Use F5 to select DIG SPEECH in the same manner as described above Use v a to select a normal speech amplitude such as 65 dB SPL Make sure the digital noise suppression feature is enabled on the hearing aid and set it up for testing in the sound chamber Press START to begin the measurement When the response curve has sta bilized pr
221. selected curve and close the menu Alternately press START to toggle the display but leave the pop up menu open This will allow you to quickly make another display change without closing the menu Press F3 to close the menu Note The status of each curve is displayed in the Curve ON OFF menu ON means the curve is measured and displayed OFF means the curve is measured and not displayed NO means the curve has not been measured To permanently delete a curve 1 Press F2 to select the curve you want to delete 2 Use F4 to delete the selected curve The following selections are available e DELETE SELECTED CURVE Deletes the curve but retains the curve set tings such as the source type and source level e DELETE SELECTED CURVE AND SETTINGS Deletes the curve and return the source type and level to their default settings e DELETE ALL CURVES Deletes all curves but retains the curve settings e DELETE ALL CURVES AND SETTINGS Deletes all curves and returns curve settings to their default selections 6 4 11 Using Smoothing in measurement curves Smoothing averages together points in a response measurement in order to achieve a smoother response curve This is useful for reducing artifacts that might be introduced in a noisy testing environment but it can also decrease the accuracy of the curve See Figure 6 4 11 for a comparison of a measurement curve with and without smoothing In composite log smoothing e From 200 Hz 2
222. ser will also be auto matically saved as the new default user 2 2 2 Setting the date and time The date and time that are displayed on every measurement screen can be changed in the Setup menu 1 Open the Setup menu by pressing MENU from the Opening screen 2 Use v a to select Year under Date Time You may want to use START to skip ahead sections in the menu 3 Use the arrow keys to change the Year Month Day Hour and Minute The v A keys choose the category and the lt gt keys make the selection 4 Use the arrow keys to decide if you want to use AM PM time or a 24 hour style clock This is changed in the AM PM 24 setting 5 Press EXIT to return to the Opening screen when done FONIX 7000 Hearing Aid Analyzer 2 2 3 Setting the user mode There are two different user modes available on the 7000 test system Beginner and Expert In the Beginner mode extra help windows pop up automatically when function keys are pressed in order to give the user more direction in using the instrument In Expert mode those help windows are eliminated To change the user mode 1 Press MENU in the Opening screen to open the Setup menu 2 Use v a to select User under Other 3 Use lt gt to choose EXPERT or BEGINNER 4 Press EXIT to return to the Opening screen The new user mode will be in effect 2 2 4 Explaining the settings The following is an explanation of all the various settings in the Setup m
223. set to normal user gain The difference curve labeled Insertion Gain on the screen shows the benefit the aid gives for sound arriving from the bad side 170 FONIX 7000 Hearing Aid Analyzer 6 9 2 2 BI CROS Unaided Measurement of better ear canal baffled by head Set up the 7000 test system as follows e Reference microphone ON BETTER BAD e Sound field LEVELED EAR EAR e Unaided set to CUSTOM PACES e Reference microphone over pinna of bad ear 7 SPEAKER e Probe microphone inside ear canal of better ear PROBE MIC REFERENCE MIC e Hearing aid in better ear on set at use gain e Transmitter on bad side turned off e Loudspeaker at 90 12 inches from bad ear Aided Measurement of better ear canal baffle overcome by aid Same setup as above except e Transmitter on bad side turned on The difference curve labeled Insertion Gain on screen shows the benefit of adding the second microphone for sound arriving from the bad side 6 9 3 Measuring Overall Insertion Gain The methods for measuring the overall insertion gain of CROS and BICROS aids are described in this section Since it has not been shown for CROS and BI CROS instruments that a 45 position of the loudspeaker improves the reliability of insertion gain measure ments we recommend a 45 position of the loudspeaker only for monaural instruments and a 0 position for CROS and BI CROS instruments Real Ear M
224. st off by toggling the test status with F6 If the mA Ampl graph is not displayed it will not be measured when Start is pressed e Use F1 to switch between left and right ear Test results for each ear can be temporarily stored All data is lost when the analyzer is turned off or when the RESET button is pressed 4 3 Coupler 1 O The Coupler I O Test measures the input output of the hearing aid from 50 dB SPL to 90 dB SPL in 5 dB steps Test results are shown in both graphical format and numerical format and can be displayed in either Gain or SPL Output See Figure 4 3 To enter the Coupler I O screen press F5 Other Tests from the Opening screen Then press F2 Coupler I O Press START to run the I O test By default this test is done with a puretone stimulus at 2000 Hz The frequency of this stimulus can be changed by using lt gt You can also toggle the source type between Puretone and Composite by using F5 The frequency selection is only available when the source type is set to Puretone FOR TPE Pee OL AER Coupler Inlet Results 20esHe Dees pres Ley Dies mature delir au SPL Win FL Si mom Si Sal bo beta Comers Settings Jtet Bie by Pt Rssnremmnt Delp Sie Prep De LE LEJ _ Bi D dL in N i w oe LEFISRDGH to miet frequencp Tees MART to man teak FLAW Por foe eer aed LAD to lere Figure 4 3 I O Test 104 FONIX 7000 Hearing Aid Analyzer A few technic
225. surements 145 6 4 2 Measuring in the Real ear SPL screen In the past ten years the SPL method of performing real ear measurement has increased in popularity In the SPL method the patient s hearing threshold lev els HTLs uncomfortable levels UCLs real ear target and real ear measure ments are displayed together on one graph in terms of dB SPL This allows for a direct comparison of audiometric measurements and real ear measurements The goal in the SPL method is to ensure the response of the hearing aid to soft signals 50 dB SPL reach above the patient s HTLs the response to average signals 65 80 dB SPL meet the target and the response to loud signals 90 dB SPL are below the UCLs In the Real ear SPL screen Figure 6 4 2 the patient s HTLs and UCLs are dis played on one large graph together with up to three real ear targets and five real ear measurements The three targets L M and H are matched to the source type and amplitude of REAR 2 REAR 3 and REAR 4 respectively That is Target Curve L is appropriate for the settings used in REAR 2 M is appropriate for REAR 3 and H is appropriate for REAR 4 When changing the source type or amplitude of any of these three measurement curves the target will automati cally adjust These curves are color coded to make it easier to match the mea surement curve to the appropriate target Target L and REAR 2 are blue Target M and REAR 3 are green and Target H and REAR 4
226. t of choices offered by a computer A hearing aid system that has a switch to select either a CROS a BI CROS or a Monaural arrangement Modified Zwislocki Couplers Three couplers based on the Zwislocki design but sturdier provided with the OES option National Acoustic Laboratories of Australia National Bureau of Standards U S now known as National Institute of Standards and Technology The 7000 s method of producing a more stable reading by averaging many samples A frequency response measured inside the ear canal with the hearing aid earpiece in place but with the hearing aid turned off This is a measure of how much unamplified sound leaks into the ear through the earpiece such as with an open fitting When measured in a real ear as opposed to a manikin it is called the Real Ear Occluded Response or REOR Low frequency intensification in the loudness level of bone conducted signals resulting from the blocking of the ear canal Occluded Ear Simulator An option on the 7000 using three special couplers that provides the same data obtained with a standard ear simulator Prescription Of Gain and Output A hearing aid prescription formula FONIX 7000 Hearing Aid Analyzer POWER PROBE MICROPHONE PT BURST PURE TONE REAL EAR MEASURE MENT REAL TIME TESTING RECD REFERENCE MICROPHONE REFERENCE POINT REAR REDD REIR RESONANCE REOR RESPONSE LIMIT RESR
227. that we can expect that the frequency response of the CIC hearing aid will be greatly influenced by the frequency dependent impedance changes of the TM What is the magnitude of these changes A fairly typical ear fitted with a standard hearing aid and earmold should have characteristics that would normally be predicted by a KEMAR manikin and standardized ear simulator When that ear is fitted with a CIC aid what is the volume between the hearing aid and the TM Because of the tilt of the TM most professionals probably don t fit the aid right next to the TM A reasonable figure may be 0 25 cubic centimeters It should be realized that this number could be higher or lower depending on circumstances 0 2 to 0 4 cc may be a reasonable range Now how much response variation will be introduced because of the small er volume of 0 25 cc This variation is that which is used in the frequency response correction table used with the CIC coupler One assumption that we make in calculations of volumes is that the simulator is small as compared to the wavelength of sound at the frequency we are examining In the case of the standard ear simulator the length of the cavity begins to affect its response to sound at frequencies above about 3000 Hz The FONIX CIC Feature 187 Knowing the physical volume of the occluded ear canal and its frequency response variations it is possible to calculate the equivalent volume of the TM itself at each frequency and to
228. the Composite signal with an RMS of 70 dB Be aware of this difference especially when viewing frequency response results in overall amplitude of dB SPL FONIY TYPE 7000 ANALYZER Coupler Left Ear Curve Characteristics Cury lt 50ource gt RMS Cor NR Name Type Trans Amp Out Chamb CLZ Chamb CL Chamb CL4 Chamb CLS Chamb CLE Chamb CL Chamb CLE Chamb cLg Chamb CL CFP Chamb Source Composite ANSI Weighted Chamber Leveled Projected Noise Reduction 4k 1 kHz gt 2 4 Source 70 dBSPL Use UP DOWN to select test level Use M1750E and HA coupler Press START to run test at selected curve Press MENU for local menu FL F2 Fa F4 F5 F F7 Fe Left Ear 2 Curve Delete Composite off OFF Prey 2003 05 29 Select Cry Select On Off Curvets Srce Select Auto Test Toggle 12238203 Figure 2 3 2 5 42 FONIX 7000 Hearing Aid Analyzer 2 3 2 6 Digital Speech technical details The digital speech signal works by turning the composite signal on for a set period of time taking a measurement turning the signal off for a random period of time and turning the signal back on again This sequence is repeated until the test ends The signal on time takes a minimum of 60 milliseconds This includes the time to turn the signal on take the measurement and turn the signal off Some aids may require an additional delay before the measurement is taken in order to allow
229. the Unaided Response When considered across a range of frequencies the measure is called the Insertion gain Response When measured in a real ear as opposed to a manikin the insertion gain response is called the Real Ear Insertion gain Response or REIR Latin for in position In audiometry it designates measurements taken with the hearing aid in place in the ear Glossary of Terms for the FONIX 7000 201 INTER MODULATION DISTORTION INVALID JIS KEMAR LED LEVELING MENU MULTI CROS MZ COUPLERS NAL NBS NOISE REDUCTION OCCLUDED RESPONSE OCCLUSION EFFECT OES POGO Distortion generated by the faulty mixture of different input frequencies This is a primary cause of harshness and lack of intelligibility in a hearing aid In the Multi Curve Option this word appears when there is no curve stored in a selected memory location Japanese Industrial Standard The organization which sets standards for measurements in Japan Knowles Electronics Manikin for Acoustic Research Model which nearly reproduces the acoustic qualities of an average adult head and torso that is utilized in the assessment of hearing aid performance Light Emitting Diode A small pilot light on an instrument panel An automatic calibration procedure establishing a zero line for measurements taking into account all the acoustic properties of the test chamber or the testing room A lis
230. the industry the first real time interactive frequency response measurement for both coupler and real ear tests This enabled an order of magnitude increase in the collec tion speed of response data This feature has been particularly useful in real ear tests where artifacts caused by ambient noise in the acoustical environment are a factor The 6500 evolved to keep pace with the technology of the hearing aid industry The 6500 C with color video came in 1992 The CX version with its faster CPU was introduced in 1994 Functions such as Multi curve Target 2 cc ANSI 92 CIC Digital Speech in Noise the real ear SPL screen and Enhanced DSP were gradually introduced making the 6500 CX analyzer more powerful with each release The number of tests on the 6500 CX grew but the operator interface remained much the same To accommodate new functions 6500 front panel buttons were programmed with functions different from their original purpose and labeling While the help messages on the screen allowed the first time user to operate the instrument it was obvious that improvements could be made Some of these 2 FONIX 7000 Hearing Aid Analyzer were implemented and tested on other Frye instruments The FP40 analyzer introduced function buttons that adapt to handle the specific needs of each test screen and sequence The FP35 analyzer added help screens and local menus to make the analyzer more intuitive and easier to use The lessons learn
231. the presence of noise at different frequencies This is useful for checking the filters of the hearing aid and determining how one channel of the hearing aid reacts to noise in a different channel of the aid To introduce a bias signal in a measurement screen 1 Enter the Real ear Insertion Gain or Real ear SPL screen set up the patient for real ear measurements and level the sound field speaker Real Ear Measurements 159 Select the Digital Speech signal source with F5 Press MENU to enter the local menu Select Bias Tone under Source using v a Use lt gt to select the level of the bias signal Choose from 40 90 dB SPL in 5 GB steps ao FF WwW N 6 Press EXIT to return to the measurement screen The Digital Speech signal will now include the pure tone bias signal 7 Press START to start the measurement 8 Use lt gt to change the frequency of the bias signal Notice how the aid reacts when the bias frequency is changed Some hearing aids don t react at all to the bias while other aids react dramatically See Figure 6 5 3 9 Press STOP when done with testing Go back into the menu to turn the bias signal OFF again a 6 S o B Figure 6 5 3 Using the bias signal in real ear measurements CRV 2 5 were measured using bias signal frequencies of no bias 500 Hz 2000 Hz and 4000 Hz respectively 6 5 4 Testing digital noise suppression The comparison of the frequency response using the
232. the printer board has failed Preparing to print printer board is busy External printer is disconnected Internal or external printer is not powered External printer is offline Internal printer has head raised If you are having a problem with the 7000 printer contact the factory Section 1 7 4 and be ready to provide the Frye technician with the error code The printer software version available in the help menu of the Opening screen will also be helpful 2 4 4 Loading the thermal paper Please read the entire instructions before loading paper Refer to Fig 2 4 4A for printer features Step I Installing the paper into the printer assembly 1 Open the printer door 2 Remove the white plastic paper roller from the printer mechanism If you are replacing an empty paper roll remove and discard the paper spool from the printer mechanism but do not discard the plastic roller The spring loaded white plastic back tension rod located directly behind the paper roller is not a removable part 3 Insert the plastic roller into a new paper roll 4 Install the plastic roller and paper roll into the printer mechanism with paper feeding from the top of the roll The paper roller will fit into the slots on the left and right side of the printer mechanism The paper roller should drop into position without additional adjustment 46 FONIX 7000 Hearing Aid Analyzer Printer _ Thermal Head Head Up Lever Thumbwh
233. tion place foam on the top of the test chamber until the total separa tion equals that recommended by the aid manufacturer 5 Attach the coupler to the receiver just as you would for an ordinary BTE or eyeglass aid 6 Align the receiver and coupler assembly on the top of the test chamber so that the receiver is exactly parallel to the transmitter in the test chamber 7 Test as you would any ordinary hearing aid Wireless BICROS BICROS systems have two microphones one on the transmitter side and the other on the receiver side 1 2 Test the receiver side as an ordinary hearing aid first Arrange the transmitter parallel to the receiver but as far as possible from it while still in the chamber You may have to unscrew the ear hooks one quarter turn to accomplish this Fun Tak may help to keep the units in posi tion but be careful not to obstruct the sound paths to the microphones Test the hearing aid again Adding the transmitter should increase the gain by the amount specified by the manufacturer It is not possible to get exact measurements by this measure because at least one of the microphones will not be at the reference point 68 FONIX 7000 Hearing Aid Analyzer Additional Notes for Testing Wireless Instruments 1 There must not be any metal objects between the transmitter and the receiv er sides 2 The two sides must be directly parallel as illustrated See Figure 3 3 7 3 The distance between the two si
234. to switch between left and right ear Test results for each ear can be temporarily stored All data is lost when the analyzer is turned off or when the RESET button is pressed 4 2 3 mA Ampl The mA Ampl test shows how much battery current the hearing aid will drain when exposed to different input level A test very similar to the I O measure ment in the ANSI S3 22 test sequence is run That is the test begins with a stimulus being presented at 50 dB SPL This amplitude increases in 5 dB steps until the final stimulus at 90 dB SPL is presented This shows how the battery current drain varies as the aid is exposed to different amplitudes By default the frequency of the stimulus is 1000 Hz This can be changed by using lt gt buttons The selected frequency is shown in a box below the mA Ampl graph You can also change the source type from Puretone to Composite by toggling F3 The lt gt buttons will not be active when Composite is selected Press START to run the test A few technical details about this test e The frequency used for a test currently being displayed on the screen is shown above the mA Ampl graph Automated Test Sequences 103 e You can view the numerical data results by entering the local menu by pressing MENU and setting DATA GRAPH to DATA by using the arrow keys Close the local menu by using EXIT or MENU again Test results will now be shown in tabular data format e You can turn this te
235. ts together A selection of 4X averages the last four measurements together When performing composite mea surements it will take several seconds for the actual noise reduction used to reach the set value This is due to the nature of the running average Larger noise reduction numbers lead to smoother curves but increase the amount of time it takes the analyzer to update its composite measurements 2 3 2 2 Intermodulation distortion The composite signals are helpful for identifying intermodulation distortion IM IM distortion occurs when amplitudes at more than one frequency in a signal combine to create an amplitude at a frequency not present in the original signal When viewing a graph run with a composite signal look for points along the graph where the line breaks up Such an appearance indicates the pres ence of IM distortion See Figure 2 3 2 2 for an example of IM distortion This type of distortion is only apparent when a composite signal source is used because pure tone sweeps do not present more than one frequency at a time General Operation 39 FONIX TYPE 7000 ANALYZER Coupler Left Ear Curve Characteristics Cury lt Source gt RMS Cor NR Name Type Trans Amp Out Chamb 60 101 1 4k Chamb Chamb Chamb Chamb Chamb Chamb Chamb Chamb CL CFP Chamb Source Composite ANSI Weighted Chamber Leveled Projected Noise Reduction 4k 1 kHz 2 4 Sour
236. tten e Full on Gain CRV 5 e Response CRV 6 e OSPL90 CRV 6 Press EXIT and F1 to enter the Coupler screen and view the JIS response curves 544 Understanding the menu settings The following menu settings are available in the local menu of the JIS screen Measurement Settings e Noise Red Tone The amount of noise reduction used in the JIS mea surements See Section 2 3 1 2 for more details e Battery Meas The status of the battery current measurement Turns it ON or OFF Battery pill required for this measurement e Battery Size The size of the battery of the hearing aid being tested Aid Settings e Sweep Start Delay The delay after the first tone is presented in a pure tone frequency sweep and before the first measurement is taken e Sweep Meas Delay The delay between frequencies in a pure tone fre quency sweep e Misc Start Delay The delay after the first tone is presented and before the first measurement is taken in the HFA SPA reference test gain equiv alent input noise and harmonic distortion measurements e Misc Meas Delay The delay between frequencies in the measurements mentioned above I O Start Delay The delay after the first tone is presented in the I O sweep and before the first measurement is taken e I O Meas Delay The delay between frequencies in the I O sweep 126 FONIX 7000 Hearing Aid Analyzer JIS Settings e Equiv Noise Test Status of the EIN measureme
237. u want to perform attack and release measure ments using a different standard use the F4 key The available test selections are IEC Loud IEC Speech JIS IEC and ANSI 96 The ANSI 03 test sequence uses settings identical to ANSI 96 This changes the test settings to those speci fied by the selected standard You can further customize the test settings by pressing MENU to open the local menu Use the arrow keys to make the desired adjustments and use MENU again or EXIT to close the menu See the Technical Details section below for more information In addition to the settings adjustable in the local menu you can also change the frequency and the source type of the test Use F5 to toggle between Puretone and Composite Use the lt gt keys to change the selected frequency You can only change the frequency when the Source Type is set to Puretone with F5 Please note that manufacturer specifications normally assume a puretone source type 106 FONIX 7000 Hearing Aid Analyzer For most hearing aids the most interesting part of the attack and release mea surements occurs at the beginning of each test After the aid reaches its settling amplitude the test result just records a rather uninteresting flat line The user can zoom in on the beginning of the test by using F6 and F7 These keys re scale the test results to show only the selected time interval The beginning of the interval is always the beginning of t
238. ule cable into the jack labeled Probe on the back of the main module Tighten the connector screw to secure the connection 2 Plug the round 8 pin connector of the dual microphone cable into the top surface of the remote module where it is marked PROBE MIC 3 Plug the monitor headset into the remote module by attaching the 4 adapt er and plugging it into the jack marked earphone if desired 19 Introduction and Setup 4 Depending on whether you have a floor stand or a swing arm either 1 Unfold and extend the floor stand to the desired height about the level of a seated client s ear or 2 Mount the wall desk bracket of the swing arm in a convenient location Attach the loudspeaker to the stand or arm using the threaded connection 5 Plug the dual banana plug into the rear jacks of the loudspeaker Then plug the other end of the cable into the main module where it is marked SPKR 1 6 5 Powering up the 7000 test system 1 Turn on the electronics module by reaching back on the right side of the main module while you are facing the front of the unit and pressing the POWER switch The green LED on the front panel above the words POWER will turn on after a couple seconds 2 Turn on the video monitor See the video operator s manual for instructions if necessary The Opening screen of the 7000 test system will be displayed It contains the FONIX logo along with the software version t
239. um type lubricant 3 A bump or peak in the low frequency response curve a There may be a hearing aid vent leak Be sure to Fun Tak the vent b There may be a coupler vent leak c The 13 coupler tubing could be cracked or broken Probe Problems 1 Probe Reference Mic does not Level Check the reference mic calibration See Appendix B Be sure the reference mic is properly plugged into the instrument Are all connections clean and tight Are the mic cables loose broken cut worn or frayed Is the Leveling signal coming out of the speaker If not check cable and connections Make sure the distance from the speaker to the ref mic during leveling is about 12 max 18 a e lou 2 Cleaning probe tubes DO NOT REUSE probe tubes There is NO recommended cleaning proce dure Germicidal solutions can leave a residue inside the tubing which can cause test result errors DO NOT cut off any portion of the tube Printer Problems 1 Printer does not work a Check for a paper jam b Press the FEED Button c Make sure the print head lock down lever is down 2 Test results do not print on paper Make sure you are using thermal paper To check it take a hard object e g a car key and scratch the surface of the paper on both sides If a black mark appears it is thermal paper If not it is plain paper and will not work Appendix D 185 The FONIX CIC Feature Background Zwislocki built an ear si
240. und the canal of the aid making the result ing donut flush with the end of the aid Some users choose to seal the vent opening at this end with a small amount of Fun Tak 3 Align the sound opening of the aid to the hole at the conical end of the coupler Look through the open end of the coupler to be sure the sound opening of the aid is clear of obstruc tions and correctly placed Basic Sound Chamber Tests 6l 4 Seal any vent on the aid with a small kernel of Fun Tak 5 Complete the acoustical sealing of the aid to the coupler by using a pen cil or finger You may want to dou ble check the aid placement through the open end of the coupler at this point Slowly reinsert the coupler microphone into its access opening 6 Place the completed assembly at the reference position in the test cham ber With ITEs the position of the aid can affect the frequency response As arule point the faceplate of the aid toward the right with the micro phone opening as close as possible to the reference circle It is best when possible to angle the faceplate upward instead of downward see the photo at left For the sake of repeatability you may elect to use a ninety degree angle of the faceplate to the reference circle again with the microphone opening as close as possible to the reference circle If you are using a battery pill be sure the metal conductor strip does not obstruct the sound path FONIX
241. use after the coupler measurement is made once you will only have to per form the real ear part of the RECD for each patient If you change the transducer or calibrate your microphones make sure to perform the coupler measurement again The following instructions assume you are using an ER3 insert earphone for performing the RECD measurement The 7000 Test System will eventually sup port an RECD method using a linear hearing aid but that feature is not yet implemented Real Ear Measurements 139 To perform the coupler measurement f at Oo e Insert the 50 ohm insert earphone into the jack on the back of the 7000 test system labeled EARPHONE Plug the other end of the insert earphone into the tubing of the ear level adapter attached to an HA 2 coupler See Figure 6 3 5A Insert a probe tube through the black probe microphone adapter as shown in Figure 6 3 5B Attach a dab of Fun tak to the adapter to keep the probe tube from slipping Attach the probe tube to the probe microphone Insert the adapter into the HA 2 coupler Press MENU from the Opening screen to open the Setup menu Press F4 to perform the coupler measurement This also saves the coupler measurement in permanent memory Press EXIT to return to the Opening screen Figure 6 3 5A Figure 6 3 5B Insert earphone attached to coupler Probe tube in probe mic adapter To perform the real ear measurement 1 Insert the 50 ohm insert earphone i
242. ve A shows the REIG prescription target When fitting to the prescription target the Curve 6 should be within 5 dB of Curve A Make any necessary adjustments to the hearing aid fitting and repeat Step 5 above to make another measurement If desired use F2 to select REAG 3 5 It is recommended to perform real ear measurements as 50 65 80 and 90 dB SPL For this reason the default source levels of REAG 2 5 are set accordingly Use the up down arrow keys to change the selected source amplitude at any time Target Curve A is always adjusted to the source type and amplitude of the current selected aided curve Measuring in the Real ear SPL screen For a description of the Real ear SPL screen see Section 6 4 2 In Figure 6 4 2 Curve 2 is displayed as a solid blue curve on the SPL graph When the NAL NL1 target is selected a blue dotted Curve L is the prescription target for the source type and amplitude used for Curve 2 To match the frequency response to target match Curve 2 to Curve L When using the NAL NL1 fitting rule Target Curve L should be used for REAR 2 Target Curve M should be used for REAR 3 and Target Curve H should be used for REAR 4 REAR 5 can be compared to the displayed U s representing the patient s uncomfortable levels to make sure that the response at 90 dB SPL does not exceed them When using a target other than NAL NL1 only the M target will be displayed in the Real ear SPL screen which uses the
243. wed in either the standard graphical format or in data format allowing the clinician to take a look at the actual numerical values of the measurements Real Ear Measurements 153 To view curve data in the Real ear Insertion Gain screen eo Ses ah Enter the Real ear Insertion Gain Press MENU to enter the local menu Select Data Graph under Display using v a Use lt gt to choose e AIDED DATA To view selected aided curve e IG DATA To view selected insertion gain curve e GRAPH To view in standard graphical non numeric format Press EXIT to return to the Insertion Gain screen Instead of the measure ment graphs you will now see tables of numerical data See Figure 6 4 9 Use F2 to select the curve you want to view Depending upon your selec tion in Step 3 you will either see the insertion gain or the aided gain results FONIX TYPE 7000 ANALYZER Probe Right REIG2 Real Ear Insertion Gain Gain Freq dB Curve Characteristics Curve lt Source gt RMS NR 22 1 Name Titl Type Trans dB Out 21 8 Po H T PRLE REUG CHG JE REAG CUG S F 65 OFF 5 PRS REAG PNP 5 5 F 65 93 1 2K F 65 Off F Fy i oJ SOO SO oo oo ooo oo FR4 REAG PNP PRS REAG PSP FRE REIG PR REIG PRS REIG PRO REIG AE TARG 20 Off 0 OFF i Source Composite ANSI Weighted Sound Field Leveled nes Projected Noise Reduction 4 Reference Mict On Smoothing Log Unai
244. wing the Curve Characteristics BOX cece cece cee eee cee e eee ene eeen eee enneeenn teens 49 2 5 2 Viewing numerical data 0 ccc ccc cece eee eee eee eee eee eee ee nee tenneteen tenes 51 2 6 Computer Connections cernis bor a a E E eee eadooua ee EE aeons ee 52 2 7 Remote Modules nia E E E ee gael TET AE EA E 52 2 8 LEVENE oea r Ar EEE E AEO AAEE EE E Mis Dawn E 53 Chapter 3 Basic Sound Chamber Tests 3 1 Th C upler Screen Display coss2 enin E E T NE O E T dese ne A E EA 55 3 1 1 Viewing a Pure tone Display 0 ccc cece cece eee eee E An EAE RAF 55 3 1 2 Viewing a Composite Display 0 ccc ccc ccc cee eee eee eee e ne eee ene en nee enn teens 56 3 2 ThetLeveling Process 3 55csot nic daie beter enh tient toukigaucns wae a ae a a a ee oak a E 57 3 2 1 Leveling the sound chamber cece ccc eect e eee e eee eee eee ene eeen eee enneeenn teens 57 3 2 2 Removing the leveling of the sound chamber 0 cc cece ese e eee e eee eeeneeeeeeeeeaaes 58 3 2 3 Saving the leveling information 00 cece cece cece eee cee nee eee ee eee eee een eeteenaaes 58 3 3 Hearing Aid Sel psi csi nod Mites ed eednanddeenr a a a e A sAneendinedsdedeseronueies 58 3 3 1 Explaining the Coupler Types 0 cece cece cece eee eee een eee ne eee n ee eenneeenn teens 59 3 3 2 In The Ear ITE and Canal Aids 0 0 cece ccc eee cence cece cette eee e eee e eee eeeeee
245. wired or wireless system to send a signal to the opposite ear Cathode Ray Tube The device in a computer system that projects information onto a display screen A visual diagram of a measurement using two variables In testing hearing aids one variable may be frequency shown on the horizontal axis of the curve and the other variable amplitude shown on the vertical axis of the curve Glossary of Terms for the FONIX 7000 199 DATA DEFAULT DIN CONNECTOR DISTORTION DSIN EAR CANAL RESONANCE EIN ERROR EXTERNAL EAR EFFECT FAST FOURIER ANALYSIS FLAT WEIGHTED FOURIER TRANSFORM FREQUENCY FREQUENCY RESPONSE FUNDAMENTAL FREQUENCY FUN TAK GAIN In FONIX analyzers the word data refers to displaying curve information as a table of numbers A choice automatically made by a computer program A European standard connector with pins surrounded by a round metal shell Elements of a reproduced sound that deviate from the original Digital speech in noise The source signal used for testing digital aids The ANSI and ICRA speech weightings are available An acoustic property of the ear canal often characterized by a peak at or near 3000 Hz Along with the acoustic properties of the head torso and pinna the Ear canal Resonance contributes significantly to the External Ear Effect Equivalent Input Noise The amplitude of internal noise created by a hearing aid The latitude of inaccur
246. with respect to fundamental Single frequency read ings made at 100 Hz intervals from 200 through 2600 Hz Sweep readings made at 100 Hz intervals from 400 through 1900 Hz ATTACK RELEASE TIME Range 1 25 to 5000 mSec Accuracy 10 or 2 mSec Resolution whichever is larger Resolution 2000 8000 Hz 1 25 mSec 800 1600 Hz 2 5 mSec 400 500 Hz 5 mSec 100 to 300 Hz and Composite 10 mSec Available Test Modes ANSI 96 ANSI 87 Signal Durations ANSI 87 2000 mSec ANSI 96 variable 500 to 5000 mSec TEST SEQUENCES Choose ANSI or IEC as part of standard package Additional charge for the second test sequence ANSI 3 22 87 92 96 IEC EN60118 7 1993 FEATURES Group Delay and Phase Measurement Battery Current Measurement Coupler Multi Curve RS232 Function AVAILABLE SIGNALS Composite Sine Digital Speech ICRA amp ANSI OPTIONS Real Ear Measurement 7000 Quik Probe 2nd Test Sequence VA CORFIG MZ coupler PRIMARY POWER 100 240 VAC 50 60 Hz Power requirement is 50 VA Specifications 175 ELECTRONICS MODULE Color Size Weight PRINTER INTERNAL Type Paper width Print speed Blue module case white front panel and gray bezel 17 4 W x 6 5 H x 14 6 D 44 2 x 16 5 x 37 1 cm 17 lbs 7 7 kg High speed line thermal printer 4 41 112 mm 80 mm s PRINTER EXTERNAL PRINTER NOT PROVIDED Port Type Language TEST CHAMBER Type Test Area Internal Acoustic Reflections
247. x TELECOIL uses the built in telecoil or the ANSI 96 telewand Static Tone Status of individual measurement Choose SINGLE to emit a static tone in between composite measurements or pure tone sweeps Choose AVG to emit a three frequency average between other measure ments Bias Tone Amplitude of the bias tone used with Digital Speech OFF turns off the bias tone entirely Composite Type Type of composite signal used Choose between STANDARD and CHIRP See Section 2 3 2 4 Composite Filter Filter used in Composite and Digital Speech measure ments Choose between ANSI ICRA and FLAT Aid Settings Aid Type Type of hearing aid being measured Choose between STANDARD linear AGC and ADAPTIVE AGC Avg Freqs Selection of three frequencies used in a three frequency aver age See Section 2 3 1 1 Sweep Start Delay The amount of time the 7000 test system presents the first tone in a pure tone sweep See Section 2 3 1 3 Sweep Meas Delay The amount of time each subsequent tone is pre sented before the measurement is made in a pure tone sweep See Section 2 3 1 3 Misc Start Delay The amount of time the 7000 test system presents the first tone in one of the following measurements reference test gain mea surements in automated test sequences averaging harmonic distortion measurements and equivalent input noise measurements See Section 2 3 1 3 96 FONIX 7000 Hearing Aid Analyzer Misc Meas Delay The amount of
248. your 7000 Test System and a small flathead screwdriver If you are calibrating the probe microphone you will also need the probe microphone adapter and a Phillips head screwdriver Sound bevel calibrator 14 mm to 1 inch microphone adapter probe microphone adapter A Fi Figure B 1A Equipment for calibrating the 7000 microphones To calibrate the M1950E coupler microphone Press MENU from the Opening screen to open the Setup Menu Press F6 to open the Microphone Calibration window Insert the 14mm to 1 inch adapter into the sound level calibrator Insert the M1950E coupler microphone into the adapter E a eGo E Turn on the sound level calibrator and look at the Coupler Mic level in the Microphone Calibration window It should match the calibrated tone emit ted by the sound field calibrator This is usually 110 dB SPL or 114 dB SPL Check your calibrator for details 178 FONIX 7000 Hearing Aid Analyzer 6 If necessary adjust the gain of the 1950E microphone by using the flathead screwdriver to adjust the gain pot on the back of the 7000 Test System next to the microphone connector Match the levels as close as possible If you are unable to adjust the gain of the microphone to the level emmited by the calibrator you probably have a faulty microphone and should contact your local FONIX distributor or the Frye factory Figure B 1B Adjusting the gain pot with a flat head screwdriver T

Frye 7000 Hearing Aid User Manual

Contents

Download Pdf Manuals

Related Search

Related Contents