Operating Instructions MA 52
Contents
1. M l Operating Instructions MA 52 MAICO 4 4 1 Crossover When measuring a pure tone audiogram you assume that the measured hearing threshold is correct But if you recognize that sound is also transmitted through bone conduction over the entire skull it is probable that the opposite ear has also received sound This is called crossover Crossover can also occur when measuring air conduction because a small amount of air conducted sound is received by the skull and transmitted by bone Whether the crossover signal can heard by the opposite ear depends on its inner ear function Relevant to crossover is the sound level which is received by the opposite ear The difference between the original test signal at the test ear and the received signal at the opposite ear is called interaural attenuation For bone conduction measurement the interaural attenuation is O to 15 dB Bone conduction crossover is therefore possible even with a slight difference in hearing loss between ears Important Please advise the patient to tell you in which ear he hears the test signal It is thereby easier to detect crossover 4 4 2 Masking theory To ensure that the patient will not experience crossover you must mask the opposite ear Masking increases the hearing threshold of the opposite ear The masking is done with a noise signal which is transmitted by the headphone For pure tone audiometry a narrowband noise is used This noise changes its center f2. ssssssssesmmmme 21 5 Speech audiometry ssssssssssssssse I m me nnn nnn nennen 23 5 1 Connecting the speech source sssssssssssese mne 23 5 1 1 Connecting a CD or tape player sssssssemRRRRI 23 5 1 2 Connection of Microphone sssssssse He 23 5 2 Speech calibration ssssssssssssssse mm 24 5 2 1 Calibration of the CD or tape with speech test material 24 Geba MAB52 e 13a doc 1 851408 2 11 11 M l Operating Instructions MA 52 MAICO 5 2 1 Calibration of the microphone for live speech test 24 5 3 Connection and calibration of the monitor phone n 25 5 3 1 Connection of the monitor phone sssssssmRR 25 5 3 2 Adjustment of the monitor phone ssssssmmR 25 5 4 Speech Audiometry ssssssssssssss IH ee nne nennen rnnt 26 5 6 VMESSIRRRENENEEEEEEMMMMMMMMMMMMMMMMMMMMI 27 6 Quick reference guide M IREREREUM 28 SAN otar Up Se CAG 6 RR ROO AE E E E E EEEE 28 6 2 Receiver selection s ssnssiusnnesiusinerirsrrerrrirsrrerirerrerrrrrrerrerrrerrerrrnrrn 28 6 3 Signal selection sssssssssssssse eI nnns 28 6 4 How to select tone or speech audiometry mode ssseussssss 28 6 5 Frequency selection 0 0 cece ccc cecc cece e cece cece I nmn nnn nnns 29 6 6 Warble tone FM c ccccecececcccccccececececececeeececseeeeeccaeaveveueueeteteeeteeenenas 29 6 7 Pulse tone 00 cece cec
3. MAICO Diagnostic GmbH MAICO Operating Instructions MAICO MA 52 MAICO Diagnostic GmbH Salzufer 13 14 D 10587 BERLIN Tel 49 30 70714650 Fax 49 30 70714699 M l Operating Instructions MA 52 MAICO Table of Contents Page INOU ed qM nro ene 4 PE ederent uu 5 3 Getting started 20 cece cece I I I I Ie nnnm nnne nnns 7 3 1 Unpacking your instrument ssssssssssse Ren 3 2 Preparing the MA 52 for use ssssssssssssseH emen 8 3 3 Getting familiar with the MA 52 ssssssssess een 9 3 3 1 Using the keyboard of the MA 52 sssssemRH estan 10 3 3 2 The display of the MA 52 ssssssssss ee 11 4 Pure tone audiometry sccwssccwasionst tuere pra iat peto aiioncapts FR Obr E URBE Pb SER DU USE ME 13 4 1 Air Conduction AC Testing ss ssiesissiresisrrerrerrrerrerrrerrerrrrrrerrerrren 13 4 2 Uncomfortable Hearing Level UCL Testing 14 4 3 Bone Conduction BC Testing ssssssssse e 15 4 4 Masking of the opposite ear sssesssseHRRH 15 dx RSS M M 16 4 4 2 Masking theory sssssssssssssse emen 16 4 4 3 Manual masking sssssssssse mn 16 4 4 4 Automatic masking ssssssssssee n 17 4 5 Diagnostic tests ssssssssssssssssee IH III nm nme nennen 18 4 5 1 Suprathreshold tests ssssssssssem 18 4 5 2 The Stenger Test mmm 21 4 5 3 The Threshold Decay Carhart Test
4. Press the PULSE key longer than 2 seconds In the lower area of the display the parameters of the ABLB DLI and SIS test are shown Using the PULSE key select the test and parameter Press one of the STIM bars G or to select your choice The lower area of the display is cleared and the selected test is shown on the display The light above the PULSE key Is on To change to another parameter press the PULSE key again and hold longer than 2 seconds To end the selected test press the PULSE key briefly Geba MAB52 e 13a doc 29 851408 2 11 11 M l Operating Instructions MA 52 MAICO 6 8 1 SISI Test Once SISI is selected the test begins immediately by conditioning in 5dB increments Press the PULSE key again to enter the next levels of SISI conditioning 3 dB then 2 dB and to start the SISI test 1dB During the test the display shows the increment level the number of presented increments and the number of correct answers given by the patient In addition Tone Now is displayed when an increment is presented and Answer Now is displayed during the answer acceptance time During SISI conditioning it is possible to clear the counters by pressing the FM key To cancel the conditioning and the SISI test and to return to standard operation press the SWAP key After 20 increments the SISI test is finished The text SISI Result with the result in percentage is shown You can stop the SISI test with the
5. at the user menu These menu items are available FF Set 1 2 Select the calibration for the first or the second loudspeaker set Bin Monaural Select the signal source channel for CD TAPE Bin Left Right User Setup Individual settings User Performance Selection of different options for the user The items of the two menus User Setup and User Performance are self explaining only accessable if option is purchased Geba MAB52 e 13a doc 32 851408 2 11 11 M l Operating Instructions MA 52 MAICO 7 Recommended literature Audiometric Interpretation A Manual of Basic Audiometry Lloyd Lyle L and Harriet Kaplan Baltimore University Park Press 1980 Auditory Disorders A Manual for Clinical Evaluation Jerger Susan and James Jerger Boston College Hill Press 1981 Handbook of Clinical Audiology Katz Jack Baltimore William amp Wilkins 1994 s Audiology Desk Reference Roeser Ross J New York Stuttgart Thieme 1996 Auditory Diagnosis Silam Shlomo and Carol A Silvermann San Diego London Singular Publishing Group 1997 Geba MAB52 e 13a doc 33 851408 2 11 11 M l Operating Instructions MA 52 MAICO 8 Computer interface The MA 52 can be connected for data transfer to a PC Caution The computer you are using must meet electrical safety requirements such as IEC 601 1 or UL This is to avoid electrical shock of either the patient or you All test results are online transferred to the PC an
6. Supratreshold test menu briefly press the FM button 4 5 1 1 The ABLB Fowler Test The Alternate Binaural Loudness Balance test is a recruitment test which uses the presentation of alternating tones between the two ears with headphones The intensity of the tone in the hearing impaired ear is varied until the loudness of the tone is judged by the patient to be equivalent to a tone at a constant intensity in the normal ear This is called loudness balance The test is done for various intensity levels in the normal ear To start the test select 0 5 sec or 1 sec modulation time in the suprathreshold menu as decribed before under 4 5 and press the STIM bar Gor On the LCD display is ABL with the chosen modulation time shown see picture 21 Adjust the desired hearing levels for both the normal ear and the impaired ear using the level control knobs and Q2 Press the STIM MODE button 3 to present the signal continuously 50a L m 2000 R 505 Tone ABL 0 5s Tone Picture 21 MA 52 display with ABLB test Now change the level for the hearing impaired ear with the level control knob or until the patient indicates that the loudness in both ears is equal Note the levels and proceed with other levels and frequencies as required To exit the test briefly press the PULSE button Geba MAB52 e 13a doc 18 851 408 2 11 11 M l Operating Instructions MA 52 MAICO 4 5 1 2 The DLI L sc
7. re 1uN dB re 1uN Dr e Harp 6000 40 S 1095 3 Geba MAB52 e 13a doc 40 851408 2 11 11 M l Operating Instructions MA 52 MAICO Calibration values DD 45 Force 45N 05N Reference equivalent threshold force level re 20 uPa for headphone Type DD 45 with coupler equency Hz IEC 60318 3 1998 Fr Geba MAB52 e 13a doc 41 851408 2 11 11 M l Operating Instructions MA 52 MAICO Calibration values FF Free sound field 0 degree incidence Reference equivalent threshold Frequency Hz sound pressure level M E M ANSI S3 6 1996 dB re 20 uPa dB re 20 uPa ISO 389 2 ANSI S3 6 1 with Coupler IEC 126 with Coupler HA 2 dB re 20 uPa dB re 20 uPa dB Reference equivalent threshold Frequency Hz sound pressure level sound dampino Geba MAB52 e 13a doc 42 851408 2 11 11 M l Operating Instructions MA 52 MAICO Standard accessories 1 air conduction receiver 1 bone conduction receiver Radio Ear B 71 1 microphone for live speech 1 patient response switch 1 power cord 1 pad of audiogram paper 50 sheets Optional accessories Loudspeaker Canton single unit Part No 801165 Portable Loudspeaker SBC pair Part No 802092 not available in the USA Insert phone Part No 4790 Talk back microphone Part No 6619 Monitor phone Part No 8697641565 Audiogram paper 50 sheets Part No 1162 417 Geba MAB52 e 13a doc 43 851408 2 11 11 M l Operating Instructio
8. GND tip out Za 4 Q Un 8 Var masking phone for BC option sleeve GND tip out Za 10 Q Un 1 Ves tape CD input right channel sleeve GND tip in Z 47 kQ Uj 0 04 5 Veg tape CD input left channel sleeve GND tip in Z 47 kQ U 0 04 5 Vet BC bone conduction receiver sleeve GND tipzout ZZ42 4 Q Up 8 Ver O monitor phone sleevezGND tip out Z4 250 Q Un 8 Ver insert phone right channel sleeve GND tip out Z4210 Q Up 1 Ver talkback microphone sleeve GND tip in Z 1 kQ U 0 38 500 mVer insert phone left channel sleeve GND tip out Z4210 Q Un 1 Veg D AC headphone right channel sleeve GND tip out Z4210 Q Un 1 Veg O live voice microphone sleeve GND tip in Z 1 kQ U 0 38 500 mVag AC headphone left channel Sleeve GND tipzout Z4210 Q Un 1 Ver u eee C axes e amp l l amp lHlolel la B D F1 L ND 2 R T M a M o Lu Picture 45 rear of MA 52 with connection plugs Geba MAB52 e 13a doc 39 851408 2 11 11 M l Operating Instructions MA 52 MAICO Calibration values AC Receiver Telephonics TDH 39 Force 4 Reference E threshold Frequency Hz sound pressure level sound damping ISO 389 1 ANSI S3 6 1 with Coupler IEC 318 2 with Coupler NBS 9A dB re 20 uPa dB re 20 uPa dB Calibration values BC Receiver Radioear B 71 Force 4 9 Frequency Hz force level air radiation ISO 389 3 ANSI 3 6 1996 ry TATIER dB
9. cables when closing the cover lay the cables in the slots provided If you are using a small portable CD player or tape you can place it on top of the cover of the MA 52 as shown in picture 29 This saves space and makes the usage of the CD player or tape very convenient Caution If you are using a CD or tape player powered by electrical current the player must meet electrical safety requirements such as IEC 601 1 or UL This is to avoid electrical shock of either the patient or you If you are not sure If your player meets these requirements it is sater to use battery power 5 1 2 Connection of Microphone Connect the microphone to the SPEECH MIC connector on the rear panel of the MA 52 see picture 32 To avoid pinching the cables when closing the cover lay the cables in the slots provided Place the microphone on top of the cover of the MA 52 as shown in picture 31 The microphone can be used for live speech audiometry and communication with the patient If your instrument is supplied with a monitor mic headset connect the phone plug labeled M with the SPEECH MIC connector O Geba MAB52 e 13a doc 23 R FF L EC MASK EC R INSERTL R AC L OOOOOQOOO SIGNAL OO 00 O DM Picture 30 MA 52 rear panel with TAPE CD input Picture 31 MA 52 in operation with portable CD player O0000000 oo 0000 a Picture 32 MA 52 rear panel with SPEECH MIC input 851 408 2 11 11 M l Operating Instructions M
10. hear the quiet tone but will also not admit being able to hear the luod tone Select the desired frequency with the frequency keys or and adjust the sound intensities with the level control knobs and Present the tone with the STIM bars and 8 The easiest procedure is to present the desired frequency into the better ear at a level of 10 dB above the threshold At the same time present the signal into the poorer ear the one with the possible feigned loss at a level 10 dB below the admitted threshold If the loss in the poorer ear is real the patient will be unaware of the signal in that ear and will respond only to the tone in the good ear If the patient does not respond at all it is likely the admitted threshold is incorrect and you have a positive Stenger 4 5 3 The Threshold Decay Carhart Test This examination is conducted as a fatigue test in cases of sensitivity loss Select the desired frequency with the frequency keys or Adjust the sound level to a value about 5 dB above their hearing threshold with the level control knob or 6 Instruct the patient to start pressing the patient response switch when he hears a tone and to release the switch when he doesn t hear the tone anymore Geba MAB52 e 13a doc 21 851408 2 11 11 M l Operating Instructions MA 52 MAICO Enter continuous tone presentation by pressing the STIM MODE button 9 to present the test signal or pre
11. tectorio testae hassto ex boneppelatuer sente tesob buses coc ppe lae 45 Checklist for Subjective Audiometer Testing 46 Geba MAB52 e 13a doc 3 851408 2 11 11 M l Operating Instructions MA 52 MAICO 1 Introduction Thank you very much for purchasing a quality product from the MAICO family This MA 52 audiometer is manufactured to meet all quality and safety requirements and has been certified with the CE symbol according to Medical Directive 93 42 EEC In designing the MA 52 we placed particular importance in making it a user friendly device meaning its operation is simple and easy to understand And because MA 52 functions are software controlled upgrading later to new extended measurement functions will be simple and inexpensive That means that you have invested in a device that will adjust to your future needs This user manual should make it as easy as possible for you to become familiar with the functions of the MA 52 Please open out the flap of illustrations on the last page The description of the position e g of controls displays and connections found again in the text will make it easier for you to learn how to operate the MA 52 If you have problems or have ideas for further improvements please get in touch with us Simply call Your MAICO team Geba MAB52 e 13a doc 4 851408 2 11 11 M l Operating Instructions MA 52 MAICO 2 Description The MA 52 is a two channel audiometer for pure tone an
12. 9 of DIRECTIVE 2002 96 EC on waste electrical and electronic equipment WEEE MAICO has changed their sales policy To avoid additional distribution costs we assign the responsibility for the proper collection and treatment according legal regulations to our customers Geba MAB52 e 13a doc 44 851408 2 11 11 M l Operating Instructions MA 52 MAICO 13 Safety Regulations 13 1 Electrical Safety The MA 52 audiometer is constructed to comply with protection Md class Il of the international standard IEC 601 1 EN 60601 1 4 Protection from an electric shock is ensured even without the system earth connection The instruments are not intended for operation in areas with an explosion hazard 13 2 Measuring security To guarantee that the audiometer works properly the instrument has to be checked and calibrated at least once a year The service and calibration must be performed by an authorized service center In accordance with the regulations of the EU medical directive we will drop our liability if these checks are not done The use of non calibrated audiometers is not allowed 13 3 Device control The user of the instrument should perform a subjective instrument check once a week This check can be done following the list for subjective instrument check see next page For your own security you should copy the enclosed list fill it in once a week and store it in your files 13 4 Operation Only skilled personnel Aud
13. 9 L Mss o R 30s Microphone selector k ey Microphone Wrong Press the left SIGNAL key longer Calibration than 2 seconds Picture 35 MA 52 display with T In the lower area of the display the speech calibration of the microphone text Calibration appears You also see the actual settings in 96 of the maximum calibration for both channels Position yourself the customary distance from the microphone and speak test words Geba MAB52 e 13a doc 24 851408 2 11 11 M l Operating Instructions MA 52 MAICO Use the left knob to adjust the level until both VU meters and show all yellow and one green light If one or more red lights are on reduce the level using the knob Store the calibration by pressing the STIM bar or G3 5 3 Connection and calibration of the monitor phone 5 3 1 Connection of the monitor phone Connect the monitor phone plug E to the MONITOR connector at the rear panel of the MA 52 see picture 34 To avoid pinching the cables when closing the cover JSUT lay the cables in the slots provided The monitor phone allows you and the patient O O O O O O O to hear the speech test material pueg vowotmme 00 sc we simultaneously This helps in determining if O OO le ll the test word was understood by the patient If the talk back option of the MA 52 is installed the communication from the o patient to audiologist will be heard with the Picture 36 MA 52 rear panel mo
14. A 52 MAICO 5 2 Speech calibration 5 2 1 Calibration of the CD or tape with speech test material The MA 52 must be calibrated to the particular speech test material in use to ensure valid test levels That means every time you change the CD or tape you must recalibrate the instrument To calibrate the Tape CD speech input select TAPE CD with the left SIGNAL selector key Press the left SIGNAL key longer than 2 seconds In the lower area of the display the text Calibration appears You A b B8 also see the actual settings in of 9 5 e the maximum calibration for both Picture33 MA 52 controls and displays channels see picture 32 TOF SPESE N ATANG On every CD or tape with speech test material you have a reference L ws 0 R 30 A Correct Ir signal such as a reference tone or Wrong 0 Tape CD speech simulating noise Calibration Perform the reference signal with Tape or CD Picture 34 MA 52 display with E Use the left knob for the left speech calibration of CD player or tape channel and the right knob for the right channel and adjust the levels until both VU meters and show all yellow and one green light f one or more red lights are on reduce the level using the corresponding knobs or 6 Store the calibration by pressing the STIM bar or 5 2 1 Calibration of the microphone for live speech test To calibrate the SPEECH MIC input select MIC with the left SIGNAL 9
15. Detected O ae duse and the modulation picture 25 MA S2 display with SS tes increments will be presented to the patient You can delay the test for the time you press STIM bar or This could be helpful in detreming if the patient malingers Tone SISI Test Tone Geba MAB52 e 13a doc 20 851408 2 11 11 M l Operating Instructions MA 52 MAICO The test will end automatically after 20 presented increments The number of detected increments is counted and indicated as percentage of the presented increments see picture 26 If you are sure that the result of the test is consistent you can abort the test 65a L m 2000 R 105 at any time by pressing the PULSE rene SISI Result Tone au orlinaly picts then indicated 20 Presented 20 Detected 4 Retrocochlear hearing impairment is Picture 26 MA 52 display with SISI result represented by low scores 25 96 cochlear defects by high scores 70 Press any button leave the SISI test 4 5 2 The Stenger Test 80 Lu 1500 R 104 The Stenger test is conducted as a ik SISI Ahorted eid malingering test in cases of alleged hearing loss or unilateral deafness It is based on the 50 Presented 1O Detected 5 premise that when two tones of the same Picture 27 MA 52 display with aborted SISI frequency are presented simultaneously into test both ears only the louder tone will be perceived The patient with a feigned hearing loss will not be able to
16. PULSE key The text SISI aborted and the actual result in percentage is shown Press the PULSE key to quit the SISI test 6 8 2 Decay test Carhart If the patient presses the patient response switch longer than 3 seconds in the lower area of the display a decay bar appears and shows the counted time until the patient releases the patient response switch To clear the display and reset the decay function press one of the STIM bars G or G3 6 9 Swap function Press the SWAP key to exchange the left and right channel The big letters R and L will be swapped in the display and the light above the SWAP key IS On Press the SWAP key again to deactivate swapping 6 10 Tracking function Press the TRACK key to activate tracking Both the left and right sides of the display amp will say TRACKED meaning that both channels are tracking each other If NOISE is selected on one channel the text TRACKED is erased because a noise channel is not allowed to track a signal channel Press the TRACK key again to deactivate tracking 6 11 STIM Mode selection Press STIM MODE key to switch between continuous presentation and presentation by pressing the STIM bar or When in continuous presentation mode the STIM bars Gand 63 function as interrupters The light above the STIM MODE key is on if continuous presentation is selected Speech and noise are always in continuous presentation except when both channels a
17. ap B 025051 p p A4 p g ku Et A pode J j P 1L 1 l f f posh f j J j T S LL f f posh j j f j ft ft Ll f oL posh j j f j 1 ft d i Bosh j j When noise B G V or S is blocked inform the service center When the test tone is heard at the masking ear contact the service center Air Conduction E Rota L S E E E L4 kHz 02505 pP B 4M ee BSESI CECE E E E EE Mus E Left Left Earpiec of Earpiec Right Right Earpiec EM Earpiec axx ao xx Should Is the last measurement of the patient For inverted measurement please reattach the headphone If the frequency difference between Should and Is for one ear averages more than 10 dB contact the SERVICE CENTER Bone Conduction Audiogram Right Far EE E Level Left Ear LeftEar S S S S kHz 02505 2 B 4 f A eara dBHV dBHV If the frequency difference between Should and Is for one ear averages more than 10 dB contact the SERVICE CENTER Geba MAB52 e 13a doc 46 851408 2 11 11 M l Operating Instructions MA 52 MAICO Specifications are subject to change MAICO Diagnostic GmbH Salzufer 13 14 1058 Berlin Telefon 49 3070 71 46 50 Telefax 49 30 70 71 46 99 e mail export maico biz MAICO Internet www maico biz Geba MAB52 e 13a doc 47 851408 2 11 11
18. bration of tape CD or live voice microphone see chapter 5 2 pulse tone enables pulsing of pure tone or warble tone ri Level enter pulse tone menu ABLB DLI and SISI Test see chapter 4 5 stim mode changes the signal presentation from presenter to interrupter mode 2nd Level enables interlock function Pressing left or right signal presentation bar affects both channels 1 SS en pruga Q vA g wc enw Geba MAB52 e 13a doc 10 851408 2 11 11 M l Operating Instructions MA 52 MAICO swap function exchanges the outputs for both ears i e the right controls now affect the left ear tracking function enables the automatic tracking see chapter 4 4 masking 2nd Level enters level steo selection menu The actual level step Is displayed at the lower center of the LCD display amp Choose the level steps with the frequency F w up down buttons and right red channel signal selector key changes the test signal from pure tone to tape CD or microphone or noise or switches the channel off 2nd Level adjustment of talkback microphone and monitor phone see chapter 5 2 right red channel receiver selector changes the receiver from AC to BC or FF or INSERT if option assembled The lighted LED above shows the current selection 2nd level selects test mode HL UCL MCL for selected receiver see chapter 4 2 right red channel talk over microphone switches on talk over microphone a
19. d data is now transferred as UCL speech data 9 Care and maintenance of the instrument Geba MAB52 e 13a doc 34 851408 2 11 11 M l Operating Instructions MA 52 MAICO Disconnect the power plug before cleaning To clean the instrument headphones bone conduction receiver loudspeaker and other accessories use a soft cloth dampened with a little warm soapy water or washing up liquid no alcohol or spirits should be used The ear cushions Z of the headphone can be detached for cleaning To remove the ear cushion Z pull it gently from the earphone To assemble the cleaned or changed ear cushion press it on the earphone and make sure that it sits properly The sound outlet hole must be Picture 43 changing of the ear cushions exactly in the middle of the earphone During cleaning please ensure that no liquid runs into the switches level control headphone capsules or loudspeaker openinos Geba MAB52 e 13a doc 35 851408 2 11 11 M l Operating Instructions MA 52 MAICO 10 Trouble shooting If you should find that your instrument is no longer working properly during a test run please check the following points Ay Diodes in the buttons do not light up and there is nothing to see on the LCD display Is the power cord plugged in correctly ED n e 9 Check the power fuses Disconnect the power plug unscrew the fuses alongside the power cord socket and check the A B fuses If th
20. d speech audiometric tests It can be used for ENT diagnostics and hearing aid fittings in the office and for mobile audiometry in clinics homes and abroad Tests can be performed using the TDH 39 headphones AC B 71 bone conduction receiver BC or optional insert phones and loudspeakers FF Built in test signals are pure tone pulse tone warble tone narrow band and broadband noise The MA 52 has a microphone for live speech audiometry and an input for an optional tape CD player with speech test material The MA 52 audiometer delivers 11 air conduction AC test frequencies from 125 Hz to 8 kHz with levels from 10 dBy to 120 dB Bone conduction BC can be tested with 11 test frequencies from 125 Hz to 8 kHz with levels from 10 dBy to 70 dBy with the standard bone conductor B 71 the frequency range is limited from 250 Hz to 6 kHz The optional insert phones EAR 3A submit levels from 10 dB to 120 dBu with 11 test frequencies from 125 Hz to 8 kHz Optional loudspeakers are available for free sound field measurements FF The new portable loudspeakers MAICO SBC have a dynamic range from 10 dBu to 80 dBu at 1m distance for nine test frequencies from 500 Hz to 8 The frequency range for speech is 500 Hz to 8 kHz with levels up to 80 Bsp The passive loudspeakers from Canton not available in the USA deliver levels up to 90 dB at 1m distance over the entire frequency range from 125 Hz to 8 kHz The MA 52 also has s
21. d stored in the database 20 L 4 1000 L 30 Tone Tone In pure tone audiometry initially all MEI measured data is transferred as BOUT MERGER hearing threshold data You Can See pure tone threshold setting the letters HL meaning threshold measurement in the upper middle of the LCD display see picture 41 To test the uncomfortable level UCL press the receiver selector button or D longer than 2 seconds and the LCD display in the upper row changes 490 a L ws Do R 30 from HL to UL All measured data is ik Ki now transferred as UCL data BEEN Picture 42 MA 52 display with To test the most comfortable level speech setting did MCL press the receiver selector button amp or longer than 2 seconds and the LCD display in the upper row changes from UL to ML All measured data is now transferred as MCL data In speech audiometry initially all measured data is transferred as multisyllable test data You can see the indication MS in the upper middle of the LCD display see picture 42 To test with single syllables press the receiver selector button or longer than 2 seconds and the LCD display in the upper row changes from MS to SS All measured data is now transferred as single syllable test data To test the uncomfortable level UCL for speech press the receiver selector button or longer than 2 seconds and the LCD display in the upper row changes from SS to UL All measure
22. dBy 6 3 Signal selection Press either the right or left SIGNAL key to select the signal The kind of NOISE signal depends on the signal of the opposite channel Speech masking noise is used if on the opposite channel the speech signal is selected see 6 4 below The display shows the selected signal below the receiver text The 5 Position is signal off The light at the signal key or and the STIM LED or is off and the level in the display is erased 6 4 How to select tone or speech audiometry mode There are two modes of audiometry Tone audiometry shows level and frequency on the display Speech audiometry shows level correct and incorrect words and speech discrimination in percentage on the display Geba MAB52 e 13a doc 28 851408 2 11 11 M l Operating Instructions MA 52 MAICO This table shows how to select one of these modes 6 5 Frequency selection Use one of the two sets of frequency keys or to select the frequency The maximum and minimum frequency depends on the receiver you have selected 6 6 Warble tone FM Press the FM key to activate the warble tone Warble is shown in the display 9 Press the FM key again to switch back to pure tone 6 7 Pulse tone Press the PULSE key to activate the pulse tone Pulse is shown in the display and the light above the PULSE key is on Press the PULSE key again to deactivate pulsing 6 8 Suprathreshold tests
23. device Eliminate any obstructions which will interfere with the placement of the earphone cushions on the ear i e hair eyeglasses Ensure the headphones are put on correctly Red side on the right blue side on the left Adjust the headband of the headphones so that the receivers are at the correct height the sound output grid amp exactly facing the ear canal Start with the better indicated ear at 1 kHz After switching on the frequency is automatically set to 1 kHz In the following example we assume that the left is the better ear Set the receiver selector to AC and the signal selector to TONE Set the left level control knob to a value just below expected hearing loss Explain to the patient that he should press the button of the patient response switch if he just hears the test tone Press the STIM bar Q for a certain time to present the test tone The STIM LED should light on If the patient hears the test tone the patient response display lights red In this case decrease the level with the level control knob Proceed with presenting the test signal as described before t hear the test tone increase the level with the level control knob Hs imum REE Proceed with presenting the test signal as described before When you find a stable threshold value note the level and frequency If the MA 52is d i1 amp le e any d toa PC the value amp 8 0 conn
24. e you have to readjust the masking level every time you change the test signal level The MA 52 has a tracking feature for easy masking Adjust for the test signal using the level control knob or 6 then with the opposite level control knob or adjust for the corresponding masking level Now press the TRACK button The masking level is automatically changed if you adjust the Picture 18 correct seating test signal level e g if the test level was 30 dB the bone conductor and the masking level 50 dB and you change the test level to 45 dB the masking level is automatically adjusted to 65 dB 45 L a 1000 R 65 e one Tone NB Noise Tracked Picture 19 MA 52 display for bone conduction with masking and enabled tracking function Geba MAB52 e 13a doc 17 851408 2 11 11 M l Operating Instructions MA 52 MAICO 4 5 Diagnostic tests 4 5 1 Suprathreshold tests The MA 52 offers additional suprathreshold tests which can offer more information about the kind of the hearing loss To access suprathreshold tests press the PULSE button longer than two seconds The suprathreshold test menu is now displayed on the lower part of the LCD display see picture 20 The actual choice is displayed inversely You can 0a L m 1000 R 305 Tone suprathreshold menu toggle through the different options by briefly pressing the PULSE button Start the chosen option by pressing the STIM bar or To exit the
25. e cee ec eee ece cece ee eee I I Im mI nm Innen nne innen nein neris 29 6 8 Suprathreshold tests sssssssssssssssss ees 29 6 8 1 SISI Test III Im nm Innen nennen nne 30 6 8 2 Decay test Carhart sssssssssssssse e nennen 30 6 9 Swap function essssssssesse em mn nnm nn ner nnne rn nennen ns 30 CAO Era Ire EU eio CENE 30 6 11 STIM Mode selection sssssssssse Imm 30 6 12 Interlock fUNCtION cece nse RR ERR 31 6 13 Talk over microphone 1 0 0 ccc cece cece cece cece eeeee es 31 6 14 Talkback microphone and Monitor volume control 31 6 15 Speech audiometry sssssssssssss nenne 31 6 16 Speech calibration ssesssssssssss eee 31 Geba MAB52 e 13a doc 2 851408 2 11 11 M l Operating Instructions MA 52 MAICO 6 17 User Menu m 32 7 Recommended literature sssssssssssssse eene 33 8 Computer interface es esiesinerisirerre rirerire rt rre rt rrer E MEE UE 34 9 Care and maintenance of the instrument sssssssm 34 10 Trouble shooting sssssssssssem RII 36 11 Technical RE MRRRT 37 12 Warranty Maintenance and After Sales Service 44 13 Safety Regulations mmm mmn nnns 45 13 2 Measuring security essssssssssssssIRHHI Im mnn 45 13 3 Device control II m nm nnne rennes 45 Iri Saule t ences u 45 13 5 Patient Safety
26. e wire In the glass vial IS broken please Picture 44 power socket and fuses insert new fuses 1 A slow blow Diodes light up but test tone is absent Green STIM LED or does not light Press STIM bar or When the diode lights up and the tone is available the device works in presenter mode Green STIM LED or 9 does light Is level control or set to an audible level position Are the acoustic receivers connected to the correct socket Is the required receiver with button or selected is the correct LED lit Is the lead connecting the headphones bone conductor or loudspeaker loose or defective If your instrument still does not work properly after this short check please consult your dealer or service center Geba MAB52 e 13a doc 36 851408 2 11 11 M l Operating Instructions MA 52 MAICO 11 Technical Data The MA 52 audiometer is an active diagnostic medical product according to the class lla of the EU medical directive 0123 93 42 EEC Standards IEC 601 1 class Il protection class BF IEC 645 1 Type 2 IEC 645 2 Type A ANSI S3 6 1996 Type 2 B Test Frequencies 125 Hz 250 Hz 500 Hz 750 Hz 1 kHz 1 5 kHz 2 kHz 3 kHz 4 kHz 6 kHz 8 kHz Level step 5 dB 2 dB or 1 dB level steps user selectable Sound Pressure Level AC with earphone 10 dB 120 dB 500 Hz 4 kHz 10 dBu 115 dB 250 Hz 8 kHz 10 dB 100 dB 6 kHz 10 dB 110 dBuj 125 H
27. ecte i Picture 12 MA 52 controls and display for airconduction Was stored with your last STIM threshold test of the left ear presentation Geba MAB52 e 13a doc 13 851408 2 11 11 M l Operating Instructions MA 52 MAICO Test through the frequencies Starting at 1 kHz set the higher frequencies first then the lower frequencies Use the frequency up key or to select the higher frequencies and use the frequency down or to select the lower frequencies Select the next frequency increase the level again and proceed with presenting the test signal as described before Once all frequencies are tested choose the poorer ear and repeat the hearing threshold test You can do this with the corresponding controls on the other side or just by pressing the SWAP button amp The SWAP 60a Rm 1200 wz L 30g function enabled means that you fene ie measure the right ear using the controls on the left side The ouput to the left and right earphones are Picture 13 MA 52 display for AC test with changed Also the left and right enabled SWAP function Pulse and Warble tone display text is changed see picture 13 s correct marks in an audiogram are O red right and X blue left Pulse tone If required the test can also be performed with a pulsed tone Press ji PULSE button and the pure tone will be switched 0 25s on and 0 25s off Warble tone If required the test can also be performed with a warble tone P
28. eparate line level outputs for an external amplifier The hearing level is controlled independently for each channel by two detented dials on the left and right of the instrument which can be operated from the side or the top The level steps are 5 dB and can be changed to 2 dB or 1 dB The signal STIM bar and the frequency up down keys are just beside the level control knobs for easy one handed control of level frequency and signal presentation The large backlighted LCD display shows level frequency transducer signal and other information for each channel As a result of modern microprocessor technology the MA 52 is easy to use and is extremely reliable Geba MAB52 e 13a doc 5 851408 2 11 11 M l Operating Instructions MA 52 MAICO The audiometer is designed to be extremely service friendly Automatic test programs make trouble shooting and the yearly calibration as easy as possible PC Interface A serial RS 232C interface for data transfer to a connected computer is built in The optional MAICO audiometry module for NOAH enables the automatic data transfer of all test results of the MA 52 like speech audiogram and ABLB DLI SISI tone decay etc For more information see chapter 8 Geba MAB52 e 13a doc 6 851408 2 11 11 M l Operating Instructions MA 52 MAICO 3 Getting started 3 1 Unpacking your instrument Your MA 52 was carefully inspected and packed for shipping However it is a good practice to thorou
29. essed as a percentage of ratio of the increments heard to the delivered increments all increments heard 100 no increments heard 0 A high score indicates a cochlear impairment A low score is related to normal hearing or conductive or retrocochlear pathology 4 5 1 3 1 Preparation of the SISI Test To start the test select SISI in the suprathreshold menu as decribed before under 4 5 and press the STIM bar or The display changes to the SISI conditioning screen as shown in picture 23 Select the test frequency with the frequency keys or For the test you should choose the 65a L m 2000m R 10 frequency where the maximum vine PADRIA ons bone conduction hearing loss is D dB Presented O Detected O measured as described in chapter 4 3 Picture 23 MA 52 display with th SISI conditioning 5dB Adjust test level with the level Geba MAB52 e 13a doc 19 851408 2 11 11 M l Operating Instructions MA 52 MAICO control knob or The level should be set to a value 20 dB above the individual hearing threshold measured under chapter 4 1 It must reach at least 60 dB Recognize that in the SISI mode the test signal is presented continuously You can interrupt the test by pressing the STIM bar or for however long you hold it down The patient must be instructed You will now hear a continuous tone Every time it becomes louder immediately push the switch 4 5 1 3 2 Trai
30. ghly inspect the outside of the shipping box for signs of damage If any damage is noted please notify the carrier immediately Carefully remove the instrument from the shipping box Remove the plastic bag from the instrument and inspect the case for any damage Notify the carrier immediately if any mechanical damage is noted This will assure that a proper claim is made Save all packing material so the claim adjuster can inspect it as well Notify your dealer or MAICO when the adjuster has completed the inspection SAVE ALL THE ORIGINAL PACKING MATERIAL AND THE SHIPPING CONTAINER SO THE INSTRUMENT CAN BE PROPERLY PACKED IF IT NEEDS TO BE RETURNED FOR SERVICE OR CALIBRATION All accessories are already packaged in the compartment connected with the MA 52 Please check that all accessories listed below are received in good condition If any accessories are missing or damaged immediately notify your dealer or MAICO Standard accessories 1 Headphone 1 Bone conduction receiver B 71 with headband 1 Patient response switch 1 power cable 1 microphone with stand only for export outside USA 1 audiogram form 50 sheets 1 monitor headset with microphone USA only 5 sound room cords USA only Calibration of the device The instrument headphones bone conduction receiver as well as the optional insert phone and loudspeaker match one another and have the same serial number e g 6631520 Because they have been calibrated wit
31. h this particular instrument use of other transducers is not allowed If one of the acoustic transducers is replaced the instrument must be recalibrated The use of non calibrated audiometers leads to incorrect measurements Geba MAB52 e 13a doc 7 851408 2 11 11 NV MAICO 3 2 Preparing the MA 52 for use The MA 52 with its integrated compartment for the accessories is perfect for portable use The rugged housing light weight and the comfortable handle make it easy and convenient to transport the instrument Carry it as shown with the bottom away from the leg That helps protect the front cover from damage and due to the asymmetrical handle position it provides more space for your leg To get started first move the handle under the housing Unlatch the cover by pressing in the two black locks located on the left and right sides near the front of the instrument Open the front cover and rest it on the back cover of the accessory compartment To open the compartment press the two black locks in the upper middle of the instrument Open the compartment cover as seen in picture 2 Take the headphone the bone conduction receiver the patient response switch and the microphone out of the compartment and connect the power cable to power The MA 52 operates with voltages from 100 to 240 V AC 50 60 Hz To avoid pinching the cables when closing the cover lay the cables in the slots provided Close the back cover and latch it with
32. her Test The Intensity Difference Limen for loudness test or Just Noticeable Difference JND is another recruitment test A pure tone is amplitude modulated at a rate of 2 second The patient has to determine whether this signal was steady or undulating beating To start the test select a modulation amplitude from 0 5 dB to 4 0 dB in 20 e L m 2000 R 20 ag the suprathreshold menu as decribed Tene DLI 1 5 dB Tone before under 4 5 and press the STIM EE bar or The LCD display shows DLI along Picture 22 MA 52 display with DLI test with the chosen modulation amplitude see picture 22 Now adjust the required test level with the level control knob or and present the test signal by pressing the STIM bar or 6 amp 3 To exit the test press the PULSE buttom longer than 2 seconds The Supratreshold tests menu is now displayed To exit the Supratreshold test menu briefly press the FM button 4 5 1 3 The SISI Test The SISI Short Increment Sensitivity Index is guided by the principle that patients with cochlear impairment are hypersensitive to small intensity increments The continuous test tone is increased by 1 dB for a period of 0 2 seconds every 4 8 seconds Whenever the patient hears the increment he she presses the patient response switch The SISI test information and the test score are shown on the LCD display The test will end automatically after 20 presented increments The score is expr
33. ient with 70 dBHL The HL in the Picture 10 MA 52 display for speech test upper row before 1500 Hz indicates that the current measurement is stored as Hearing Level threshold test Picture 10 shows the display for a speech test with speech test material from tape or CD of the left ear and masking of the opposite ear The left part of the LCD display shows the settings for the left channel level 60 dBHL receiver AC signal tape CD The middle of the LCD display amp shows the actual test and the result MS stands for multi syllable speech test speech discrimination 60 correct words 6 wrong words 4 The right part of the LCD display shows the setting for the right channel level 60 dBHL receiver AC signal speech noise masking Speech Noise The LCD display has an energy saver function the backlight of the display is automatically switched out after approximately three minutes Any action with the MA 52 such as pressing a button or turning the knobs switches the backlight immediately on again Geba MAB52 e 13a doc 12 851408 2 11 11 M l Operating Instructions MA 52 MAICO 4 Pure tone audiometry 4 1 Air Conduction AC Testing In the hearing threshold test the hearing threshold of the patient is measured in comparison with the normal hearing threshold for air conduction The test is started on the ear with better hearing The patient should sit at a distance of at least 1 m from the
34. ingly with other test frequencies For hygienic reasons it is important to clean the ear cushions of the headphone see chapter 9 4 3 Bone Conduction BC Testing Bone conduction i e the transmission of sound waves through the skull directly to the inner ear A P gt conways information about the function of the inner ear For a neural hearing loss the values of air conduction chapter 4 1 and bone N 5 conduction are the same In this case a hearing V loss of the middle ear can be eliminated Place the bone conduction receiver so that Picture 15 Bone conductor the flat circular side of the transducer Y is placed on the mastoid at the noticeable ledge of the cranial bone behind the auricle see picture 16 The other side of the headband is placed in front of the opposite ear Set the receiver selector or to BC and the signal selector or to TONE Perform the test the same way as for air conduction see 4 1 Enter the measurements for all frequencies on the form connect all points with dotted lines marked on the audiogram form as Picture 16 correct seating follows 2 right and left of the bone conductor For hygienic reasons it is important to clean the bone conductor see chapter 9 4 4 Masking of the opposite ear The basics of masking are explained below To begin testing immediately please go directly to 4 4 3 Manual masking Geba MA52 e 13a doc 15 851 408 2 11 11
35. iologists ENT professionals or other with equivalent knowledge should operate the instrument 13 5 Patient Safety Please note that if connection is made to standard equipment like printers and network special precautions must be taken in order to maintain medical satety Connecting this device to other devices in order to make a system may cause the safety specifications to be invalid It is therefore recommended to insert a galvanic separation between the device and the host computer unless the computer is battery operated or supplied by a medical approved power supply Galvanic separation must fulfil the EN 60 601 1 Geba MAB52 e 13a doc 45 851408 2 11 11 M l Operating Instructions MA 52 MAICO Checklist for Subjective Audiometer Testing Clean the ear and head cushion Untangle all lines when necessary Instrument Are the headphone cushion in good condition Man ufacturer If not gt replace Are plugs and leads in good condition undamaged Serial No Are all controls working properly Is the Patient Response Key working properly if available Exa mM ner Check batteries and renew if necessary Test Signal Quality All the test frequencies in the below table indicate typical hearing level and can be changed when necessary Masking B for Buzz tone G for Noise V for signal distortion S for switching masking noise Righttar evd left Ear kHz 2505 p p
36. lse tone 0 5 s on off Warble tone triangular freq devitation 5 repetition rate 5 Hz ABLB Fowler 0 5sand1s DLI L scher 4 3 2 1 5 1 and 0 5 dB SISI test 5 dB 3 dB 2 dB conditioning 1 dB test Modulation time 4 8 0 2s Carhart decay test built in stop watch Stenger test Tone presenter interrupter Interlock tone presentation of both channels simultaneously Channel swap Tracking fixed level difference between both channels less than 10 min after power on continuous MM AN AAN mm 15 435 C 459 4 95 F operation 5 450 C 41 4 122 F storage Maximum humidity 90 storage and operation According to water ordinary equipment According to sterilization not applicable WxDxH 36x 46x 15cm 14 2 x 18 1 x 5 9 4 6 kg 10 1 Ibs with accessories 5 8 kg 12 8 Ibs 100 240 V 50 60 Hz 10 96 app 25 VA 2x 1A slow blow 38 851 408 2 11 11 M l Operating Instructions MA 52 MAICO Connection plugs Connection Specification power socket left rightzpower 100 240 V 50 60 Hz middle2prot GND power fuses 1 A slow blow serial PC interface 1 GND 2 RX 3 TX RS 232 C 5 GND 6 DTR patient response switch sleevezGND tip in R 500 Q signal output right sleeve GND tip out Z4 47 kQ Un 8 Ves signal output left sleevezGND tipzout Z4 47 kQ Un 8 Veg FF loudspeaker right channel sleeve GND tip out Z4 4 Q Un 8 Veti D FF loudspeaker left channel sleeve
37. ning of the Patient Only with careful training during the 654a L 4 2000 4 R 104 following conditioning phase can a valid i Kir test result be achieved The training starts with a dB Presented 4 Detected modulation level of 5 dB That paue 24 MA 52 display with SISI means a continuous tone e g 65 conditioning 5dB and presented increment dBu is briefly increased every 4 8 seconds for 0 2 seconds by 5 dB e g to 70 dBu During the increment time the text Tone Now is shown on the lower area of the LCD display see picture 24 The text Answer now appears for approx 1 5 seconds During this period the patient may respond If he she answers too early or too late the answer will not be accepted by the MA 52 The number of detected increments is counted and shown on lower right area of the display Furthermore the number of presented increments is shown see picture 24 When you are sure that the patient has understood the object of the test press the the PULSE button The modulation level will be changed to 3 dB If the patient has understood this part of the test also press the the PULSE button again The modulation level will be reduced to 2 dB Tone SISI Conditioning Tone 4 5 1 3 3 SISI Test It the patient has understood the test up to here press the PULSE 5 L m 20004 R 105 button again to start the SISI test The LCD display indicates SISI test 1 dB Presented QO
38. nitor phone with MONITOR phone output 5 3 2 Adjustment of the monitor phone To adjust the output level of the monitor phone press the right SIGNAL key longer than 2 seconds gs L Nine f i 3 In the lower right area of the display 7 ____ the text Monitor appears Below 0 that you see the actual settings in 96 picture 37 MA 52 display with of the maximum output level see adjustment of the monitor phone picture 37 Perform a test signal with Tape CD or the talk back microphone if installed the right knob and adjust the output level that is comfortable Or you Store the adjustment by pressing the STIM bar or Geba MAB52 e 13a doc 25 851408 2 11 11 M l Operating Instructions MA 52 MAICO 5 4 Speech Audiometry The speech recognition threshold SRT is the hearing threshold for speech It is the lowest level at which the patient correctly recognizes the stimuli 5096 of the time Usually recognition is indicated by repetition of the speech stimulus item The speech test can be done with recorded speech test material from CD or tape or with the microphone and live voice using standardized word lists Different methods for speech tests are standardized worldwide such as the ASHA guidlines for determining the threshold leue for speech Asha 21 page 353 356 Explain to the patient that he should repeat each word he hears The patient should sit at a distance of at least 1 m f
39. ns MA 52 MAICO 12 Warranty Maintenance and After Sales Service The MAICO MA 52 is guaranteed for 1 year This warranty is extended to the original purchaser of the instrument by MAICO through the distributor from whom it was purchased and covers defects in material and workmanship for a period of one year from date of delivery oft the instrument to the original purchaser The MA 52 may be repaired and serviced only by your dealer or by a service center recommended by your dealer We urgently advise you against attempting to rectify any faults yourself or commissioning non experts to do SO In the event of repair during the guarantee period please enclose evidence of purchase with the instrument In order to ensure that your instrument works properly the MA 52 should be checked and calibrated at least once a year This check has to be carried out by your dealer When returning the instrument for repairs it is essential to send the headphones as well Send the device to your dealer or to a service center authorized by your dealer Please include a detailed description of faults In order to prevent damage in transit please use the original packing if possible when returning the instrument Within the European Union it is illegal to dispose electric and electronic waste as unsorted municipal waste According to this all MAICO products sold after August 13 2005 are marked with a crossed out wheeled bin Within the limits of Article
40. re selected as noise Geba MAB52 e 13a doc 30 851408 2 11 11 M l Operating Instructions MA 52 MAICO Press the STIM MODE key again to deactivate continuous presentation 6 12 Interlock function Press the STIM MODE key longer than 2 seconds to activate the interlock function The display shows the text Interlock Interlock works only if both channels have the same kind of signal Speech tone or noise In modes where no interlock is available the display shows No Interlock Press the STIM MODE key longer than 2 seconds to deactivate the interlock function 6 13 Talk over microphone Press one of the TALK OVER keys and In the lower area of the display the volume level of the talk over microphone is shown Adjust the talk forward volume with the left or right knob Release the TALK OVER key or if you have finished talking to the patient 6 14 Talkback microphone and Monitor volume control Press the right SIGNAL key longer than 2 seconds and the volume control bars for TB and monitor are shown Adjust the monitor volume with the right knob Adjust the talkback microphone volume with the left knob To store the actual settings press one of the STIM bars or 6 15 Speech audiometry To select speech audiometry switch both channels to TAPE CD or MIC by using the SIGNAL selector keys amp and de In speech mode the display shows the percentage of correct repeated words Below thi
41. requency according to the frequency of the test signal 4 4 3 Manual masking It you have to mask use the common masking rules See chapter 7 for recommend literature Masking is an important part of practical audiometry It is necessary to be familiar with this topic to avoid errors which would lead to a wrong diagnosis For the opposite ear set the receiver selector or to AC and the signal selector or to NOISE Adjust the required masking level with the level control knob or Notice that the masking sound is continuously presented for effective masking You can interrupt the masking signal by pressing the corresponding interrupter key or To mask when performing bone conduction testing place the headphone on the opposite ear so that the receiver is at the correct height the sound output grid amp exactly faces the ear canal Adjust the headband of the headphones The receiver on the side where the bone conductor is placed should sit directly on the cheek bone Geba MAB52 e 13a doc 16 851408 2 11 11 M l Operating Instructions MA 52 MAICO The marking for air conduction with masking should be done with the symbols A the right side and M the left side on the audiogram form The marking for bone conduction with masking should be done with the symbols the right side and the left side on the audiogram form 4 4 4 Automatic masking With the manual masking as described befor
42. ress the FM button and the pure tone will frequency modulate The warble tone can also be pulsed as described before For hygienic reasons it is important to clean the ear cushions of the headphone see chapter 9 Tone 4 2 Uncomfortable Hearing Level UCL Testing Testing of UCL can be measured using pure tone stimuli or speech live voice or tape CD The purpose is to determine the dB level at which the stimuli becomes uncomfortable to the patient This information is valua S upper dynamic range limit for proper hearing aid fittings and for determining symptoms of recruitment Warning Because this test uses high sound pressure levels it is extremly important to perform this test using the utm s MCL Most Comfortable Level The UCL level is described as the level between very loud and loud perception of the test signal Geba MAB52 e 13a doc 14 851408 2 11 11 M l Operating Instructions MA 52 MAICO Press the receiver selector button or longer than 2 seconds 000 L 30 The LCD display in the upper row pO aci i 30g changes from HL to UL see picture 14 LLL Start as described in chapter 4 1 Picture 14 MA 52 display for UCL test left with a test level of 60 dB Present the tone briefly max 1s If the signal was recognized by the patient as not uncomfortable increase the level and proceed as described before If the signal was uncomfortable for the patient note the values Proceed accord
43. ress the STIM bar or to transfer the test result to the PC see also chapter 8 Geba MAB52 e 13a doc 26 851408 2 11 11 M l Operating Instructions MA 52 MAICO To clear the counter for the next test press the FM key Q It is also possible to perform the speech test with loudspeakers e g for the verification of hearing aid fitting or bone conduction 40s L i2 7o R 105 Wrong 5 rong Select the required transducer with _ Teee Cb the RECEIVER selection button or D and proceed as described before Tape CD Picture 40 MA 52 display with 5 6 Masking typical result for speech audiometry Speech audiometry has similar masking rules to those desribed in chapter 4 4 for pure tone audiometry When TAPE CD or MIC is selected on one channel and NOISE masking on the opposite channel the MA 52 automatically performs speech masking noise Geba MAB52 e 13a doc 27 851408 2 11 11 M l Operating Instructions MA 52 MAICO 6 Quick reference guide 6 1 Startup settings Air conduction on both channels Pure tone on both channels 30dB on both channels Presenter mode 6 2 Receiver selection Press either the right or left RECEIVER key to select the receiver AC BC FF INSERT The display shows the selected receiver below the levels Not available receivers will be skipped It is not possible to select bone on both channels simultaneously After a new selection the level will be reset to 30
44. rom the device Eliminate any obstructions which will interfere Picture 38 Headphone with the placement of the earphone cushions on the ear i e hair eyeglasses Ensure the headphones are put on correctly Red side on the right blue side on the left Adjust the h eadband of the headphones so that the receivers are at the correct height the sound output grid exactly facing the ear canal Set the receiver selectors and to AC and the signal selectors and Misco 30 both to TAPE CD if you are using recorded speech test material or to MIC if you wish to perform a speech Picture 39 MA 52 display with test with live speech initial settings for speech audiometry On the LCD display the initial setting for speech audiometry see picture 37 appears The percent speech discrimination score is displayed in the middle Below this the number of correct and incorrect words is shown If you are using CD or tape put the monitor phone on to hear the test words Depending on your test method use the level control knob or to set the start level Perform the test words Tally the correct words by pressing the frequency up key or Tally the incorrect words by pressing the frequency down key or When you finish a word list note the percentage of the speech discrimination score In the example shown in picture 38 one half of the words were heard correctly If you are working online with a PC p
45. s above the receiver selectors and and the signal selectors and are lighted The frequency is set to 1 kHz and the level to 30 dBHL for the left channel 10 dBHL noise for the right All these settings are also shown on the display see picture 5 The hearing level can be easily adjusted independently for each channel with a knob and on each side of the instrument For optimal convenience these level control knobs are usable trom the top or the side of the instrument They are detented in 5 dB steps adjustable to 2 dB or 1 dB The signal STIM bars and are located beside the level control knobs The signal LEDs and light up when the signal is presented You can change trom presenter to interrupter Tunction with the STIM MODE button The corresponding LED lights when the interrupter is selected The frequency is changed with up amp and down buttons for both channels together The design of the MA 52 makes it easy to control level signal presentation and frequency with one hand Geba MAB52 e 1 3a doc 9 5 10 1G 48 Picture 4 MA 52 power switch display and selection buttons for left and right channel 305 L 4 1000m R 104 r Tone Noise 26 Picture 5 MA 52 display with initial settings ea ctu cy 13 23 25 2 4 7 22 04 va Picture 6 MA 52 level and frequency control 851 408 2 11 11 M l Operating Instructions MA 52 MAICO 3 3 1 Using the ke
46. s long as the button is pressed The level can be adjusted with the knobs or The actual value is displayed in dBHL at the lower center of the LCD display 9 right red frequency down change to next lower frequency right red frequency up change to next higher frequency E en IO O log eyboard 1 Picture 3 MA 52 3 3 2 The display of the MA 52 The large backlighted graphical LCD Display of the MA 52 shows all actual settings uds 1200 208 and test results The display area is split peses ues i i i alk Wyer with a line into an upper or main area and a lower or advanced area see picture 9 The Picture 9 MA 52 display for BC test main area shows the individual settings for the left channel on the left and the right channel on the right General settings which affect both channels are displayed in the middle The example Geba MA52 e 13a doc 11 851 408 2 11 11 M l Operating Instructions MA 52 MAICO picture 9 shows a typical setting for a BC threshold test The left channel is bone conduction with 70 dB tone and tracking function enabled The right channel is set to 90 dB narrow band noise with air conduction for masking The test frequency is 1500 Hz and the test signal is a warble tone The 60 L us 60 R 60 ge SOrrect 4 IF rong lower section of the display shows that fiheso the talk over microphone button or is pressed and the audiologist talks to the pat
47. s percentage the number of correct and wrong receipted words is shown To count the correct words press one of the frequency up keys or To count the wrong words press one of the frequency down keys or 6 To clear the counter press the FM key 6 16 Speech calibration To calibrate the speech inputs Tape CD or MIC select the signal you d like to calibrate with the left SIGNAL selector key Press the left SIGNAL key longer than 2 seconds In the lower area of the display the text Calibration appears Perform the reference signal with Tape CD or microphone Use the left knob for the left channel and the right knob 6 for the right channel and adjust the levels until both VU meters and show all yellow and one green light If one or more red lights are on reduce the level using the corresponding knobs or Store the calibration by pressing the STIM bar or Geba MAB52 e 13a doc 31 851408 2 11 11 M l Operating Instructions MA 52 MAICO 6 17 User menu To enter the User Menu you have to press the FM key during instrument switch on To choose an item from the menu use the FREQUENCY keys or To select the chosen item press one of the STIM bars or Change the actual setting with the FREQUENCY keys or To confirm the changed setting press one of the STIM bars Q or To return without change press the FM key 9 To return to the standard operation press the FM key
48. slight pressure You can place the microphone or a tape or CD player on top of the cover see picture 3 The MA 52 should be operated in a quiet room so that the audiometric examinations are not influenced by outside noises For use in noisier environments headphones with optional sound insulation muffs are available Electro medical instruments which emit strong electromagnetic fields e g microwaves radiotherapy devices can influence the function of the audiometer Therefore the use of these instruments is not allowed in close proximity to the audiometer Operating Instructions MA 52 Picture 1 Transport of MA 52 frm FOREN a Picture 3 MA 52 in operation The test room must be at normal temperature usually 15 C 59 F to 35 C 95 F and the instrument should be switched on about 10 minutes before the first measurement to guarantee precise measuring results If the device has been cooled down e g during transport please wait until it has warmed up to room temperature Geba MAB52 e 13a doc 8 851408 2 11 11 M l Operating Instructions MA 52 MAICO 3 3 Getting familiar with the MA 52 Turn on the instrument with the power switch which is located at the right side of the MA 52 The device performs its initial test and autocalibration If an error is detected the test is stopped and a description of the error is shown on the LCD display In this case please contact your local dealer or service
49. ss the corresponding STIM bar or Q3 The PAT response LED lights and after two seconds a bar stop watch with a scale from O to 60 seconds appears on the lower area of the LCD display see picture 28 When the patient releases the switch the bar of the stop watch stops and you can see the time the patient heard the tone see example picture 29 If the time was less than 60 seconds increase the level with the level control knob or by 5 dB Press any button to erase the stop watch on the display and start the test again Continue this procedure until the patient can hear the tone at least for 60 35a Lm 500 R 105 Tone Tone Desay pg sec Picture 28 MA 52 display with initial tone decay test 35a Lm 500 R 10 Tone Tone oe sec Picture 29 MA 52 display with example tone decay test seconds The threshold shift can be entered on the tone audiogram pad by drawing a wavy line under the selected frequency Geba MAB52 e 13a doc 22 851 408 2 11 11 M l Operating Instructions MA 52 MAICO 5 Speech audiometry 5 1 Connecting the speech source 5 1 1 Connecting a CD or tape player To conduct speech tests using speech test material you can connect a CD or tape player to the MA 52 Use a standard phono plug cable to connect the right and left outputs of the device with the corresponding inputs and on the rear panel of the MA 52 see picture 28 To avoid pinching the
50. yboard of the MA 52 All main functions of the MA 52 are directly accessable by pressing a single button Not frequently used procedures like the calibration of the speech source or the level step selection are hidden as a second level function To select this function Just press the addressed button more than two seconds A user menu for T the customization of the MA 52 is M i Fur mo red t for advanced users see chapter JV V NY 6 Following is the description of the main and second level functions of each button left blue channel frequency up change to next higher frequency amp left blue channel frequency down change to next lower frequency 6 left blue talk over microphone switches on the talk over microphone as long as the button is pressed The level can be adjusted with the knobs or The actual value is displayed in dBu at the lower center of the LCD display left blue channel receiver selector changes the receiver from AC to BC or FF or INSERT if option assembled The lighted LED above shows the current selection 2nd level selects test mode HL UCL MCL for selected receiver see chapter 4 2 FM modulation warble tone changes test signal from pure tone to warble tone 2nd Level to enter the user menu press button during power on left blue channel signal selector changes the test signal from pure tone to tape CD or microphone or noise or switches the channel oft 2nd Level Cali
51. z 10 dBHL 80 dBHL BC with bone conduction receiver Radioear B 71 10 dB 70 dBu 500 Hz 750 Hz h kHz 6 kHz 10 dB 60 dB 250 Hz 10 dBu 45 dByj 125 Hz 8 kHz no output speech 10 dBy 80 dBu Insert earphone with optional EAR 3A 10 dB 120 dByy 750 Hz 1 b kHz 10 dBu 115 dBu 500 Hz 4 kHz 10dBy 110 dB 250 Hz 10 dBu 105 dBu 6 kHz 10 dBu 95 dBu 125 Hz 10 dB 90 dBu 8 kHz 10 dBu 85 dB FF with optional loudspeaker type Canton not available in USA 10 dB 90 dBy measurement In 1m distance 1 KHz 1 5 kHz 10 dB 85 dB HL 500 Hz 750 Hz 10 dBu 80 dB Bur 250 Hz 6 kHz 8kHz 10 dB 75 dB 125 Hz 10 dByi 60 dBu speech 10 dB 85 dBy FF with optional portable loudspeaker MAICO SBC 10 dBu 85 dBy measurement In 1m distance Geba MAB52 e 13a doc 37 851408 2 11 11 M l Operating Instructions MA 52 MAICO Test Signal Modulation Tests Functions Warm up time Mode of operation Environment conditions Dimensions Weight Power Supply Power Consumption Device Fuses Geba MA52 e 1 3a doc 750 Hz 2 kHz 8 kHz 10 dBHL 80 dBu 500 Hz 6 kHz 10 dBu mE dBu 125 Hz 250 Hz no output 2 kHz 6 kHz 10 dB 90 dBu 3 kHz 4kHz 10 dBu 100 dB Pure tone pulse tone warble tone narrowband noise broadband noise speech masking noise Pu
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