User Manual
Contents
1. Change Save Press Change to enter and or modify the license key of the AS608 AS608e instrument Use button 2 to change the letter and button 1 to move the cursor Press Save to return to the main setup menu About Frequencies License AS6OSb ver 102 Gen Sa gt a Press Back to return to the main setup menu Press Save to return to measurement screen of the AS608 AS608e AS608 AS608e Operation Manual Page18 Technical Specifications Standards Meets or exceeds EN 60645 1 type 4 and ANSI S3 6 Safety Standard EN 60601 1 Class Il type B Calibration ISO 389 1 EMC EN 60601 1 2 Medical CE mark The CE mark indicates that Interacoustics A S meets the C requirements of Annex Il of the Medical Device Directive 0123 93 42 EEC TUV Product Service Identification No 0123 has approved the quality system Frequencies and Intensities Freq Hz AC dB HL 125 70 250 90 500 100 750 100 1000 100 1500 100 2000 100 3000 100 4000 100 6000 100 8000 90 Inputs Tone Warble Tone 5 5Hz true sine wave frequency modulation Outputs Left and Right Tone Presentation Manual or Reverse chosen in Setup Menu Multiple pulses 250 or 500msec chosen in Setup Menu AS608 AS608e Operation Manual Page19 Talk Forward Built in talk forward microphone 0 110dB SPL Continuously adjustable on operation panel Auto Threshold Patient c2. repair exchange other C defective as described below with request of assistance O repaired locally as described below C showing general problems as described below Item Type Quantity Serial No Supplied by Included parts Important Accessories used together with the item must be included if returned e g external power supply headsets transducers and couplers Description of problem or the performed local repair Returned according to agreement with O Interacoustics C Other Date Person Please provide e mail address or fax No to whom Interacoustics may confirm reception of the returned goods C The above mentioned item is reported to be dangerous to patient or user 1 In order to ensure instant and effective treatment of returned goods it is important that this form is filled in and placed together with the item Please note that the goods must be carefully packed preferably in original packing in order to avoid damage during transport Packing material may be ordered from Interacoustics 1 EC Medical Device Directive rules require immediate report to be sent if the device by malfunction deterioration of performance or characteristics and or by inadequacy in labelling or instructions for use has caused or could have caused death or serious deterioration of health to patient or user Page 1 of 1
3. Relative Humidity 10 95 Computer requirements Must comply with IEC 60950 1 Equipped with a USB connection AS608 AS608e Operation Manual Page21 Included Parts TDH39 Audiometric Headset 200 AF12 Audiogram Charts TC608 Carrying Bag Pen set 3 pens Operation Manual Multilingual CE operation instructions CD Diagnostic Suite only AS608e Standard USB cable only AS608e Additional Parts ASA30M 0301 External Power Supply Medical CE Approved APS3 Patient Signal Button 21925 Audiocup Noise Excluders 50250 Peltor Noise Excluders Electrical Installation Left Right Patie amp Resp USB Sockets for transducers left blue and right red Socket for external power patient response APS3 AS608 AS608e Operation Manual Page22 Compartment for three AA size batteries a gay py UJ UJ J L O a r O OJI AS608 AS608e Operation Manual Page23 External Connections Standard Accessories dee Le Right Patient Resp USB 2 fb L Standard Patient Headphones Response TDH39 Switch APS3 AS608 AS608e Operation
4. Please refer to the Diagnostic Suite user manual for instructions about how to use the PC software suite e In addition to traditional manual testing the AS608e incorporates a Hughson Westlake patient controlled automatic threshold test complying with ISO 8253 When the test is completed the results are easily recalled from the internal memory of the AS608 e Talk Forward function that makes the AS608e easy to work with particularly in sound booth installations AS608 AS608e Operation Manual Pagel Precautions WARNING indicates a hazardous situation which if not avoided could result in death or serious injury CAUTION used with the safety alert symbol indicates a hazardous situation which if not avoided could result in minor or moderate injury NOTICE is used to address NOTICE practices not related to personal injury Be sure to use only stimulation intensities NO TICE which will be acceptable for the patient The transducers supplied with the NO TICE instrument are calibrated to this instrument exchange of transducers require a recalibration It is recommended that parts which are in NO TICE direct contact with the patient e g earphone cushions are subjected to standard disinfecting procedure between patients This includes physically cleaning and use of a recognised disinfectant Individual manufacturer s instruction should be followed for use of this disinfecting agent to provide
5. Manual Page24 Unpacking Inspection Check box and contents for damage When the instrument is received please check the shipping box for rough handling and damage If the box is damaged it should be kept until the contents of the shipment have been checked mechanically and electrically If the instrument is faulty please contact the nearest service office Keep the shipping material for the carrier s inspection and insurance claim Keep carton for future shipment The AS608 AS608e comes in its own shipping carton which is specially designed for the AS608 AS608e Please keep this carton It will be needed if the instrument has to be returned for service If service is required please contact your nearest sales and service office Contents of Shipment Delivered items with AS608 AS608e AS608 AS608e is as a standard unit delivered with the following ltem Order No Instrument AS608 AS608e Audiometric Headset TDH39 Audiogram Forms AF12 Pen Set 3 pens Carrying bag TC608 Operation manual Multilingual CE operation instructions CD Diagnostic Suite only AS608e APS3 Patient Signal Button only608e Standard USB cable only AS608e AS608 AS608e Operation Manual Page25 Check numbers on AS608 AS608e and Manual The identification label on the rear plate holds the serial number This should be checked with the manual number and written down for later service claims To observe the CE mark of AS608 AS608e with an exte
6. 08 AS608e Operation Manual Page6 Air Conduction Hearing threshold levels can be determined by presenting test signals to the test subject with the included earphones air conduction AC The purpose of AC audiometry is to establish the hearing sensitivity at various frequencies The test can specify the AC loss but cannot distinguish between abnormality in the conductive mechanism and sensor neural mechanism Headset Placement Remove eye glasses and ear rings if possible and position the headband directly over the top of the head Place the rubber cushions so that the diaphragms are aimed directly at the opening into the ear canal Pull down the yokes of the phones and adjust for tight fit If the cushions are not tight to the ears the test results may be false at lower frequencies Background Noise Background noise can also produce false test results especially at lower frequencies If necessary the TDH39 can be equipped with noise excluding enclosures Please contact the distributor for more information Instruction of Subject Prior to hearing threshold level measurements the following instructions should be given You will now hear a variety of pitches with various loudness levels Please push the signal button when you hear a tone and release the button when you no longer hear it If not using the response button ask the patient to raise their left or right hand when you hear the tone in the left or right ear Thre
7. Operation Manual Screening Audiometer AS608 AS608e Valid from serial 744081 80696202 ver 05 2009 Table of Contents Table of Contents uuesuunsannsnannnnnnnnnnnnnnnnnnnnnannnnnnnnnnnnnnnnnnnnnannnnn nenn 1 Iotrogd OO ii een 1 Intended Use 22 m 82422 Bea ana 1 Extended Function sessssesesessessnnnnetssretsnnnnstestnnnnnnnestnnnnnnnnennent 1 NL 4 2 a EAER 2 A E 5 Air COMGUCUION cai iii 7 Functions of Buttons amp Display nensesnnnennnnnnnnnnnnnnennnnnnnnnnnnennnnnn 10 Power Up and Power OP 10 Pure Tone PDresentaton nn 10 AS608e Special Functions ur220u0r200nnneensnnnnnnnnnnnnnnnnennnnennn 11 Ae 12 Setup Menu of AS608 AS6088e unnunnannsnnnnnnnannnnnnnnnnnnnnnnnnnnnannnnnann 14 Technical Specifications nunsuesnnnnnannnnnnnnnannnnnnnnnnnnnnnnnnnnnnnnnnnnnn 19 Balls ee er een 22 Electrical Installation nn nnnnnnnnennnnnnnnnnnnennn 22 External Connections Standard Accessories eeeeeeeeeeee 24 Unpacking Inspection nnesnnsennnnnnennnnnnnnnnnnnnnnnnnnnnnennnnannnnnnnannnnnn 25 Contents of Shipment sssssesesesesesenesrrssrresrnsstnsstnsstnssrnssressrnnsrnne 25 Reporting Impertechons einna aa iA 26 Operating Temperature nn 27 Care and Maintenance cccoooccccnnnoccnonononcnnnonncnnnono nn conan nn nnnnnnnnnnnns 27 Trouble Shooting uuesusnssnnsnannnnnnnnnnnannnnnnnnnnnnnnnannnnnnnnnnnnnnnannnnn nn 28 Dictonaty E 29 Appendix General Maintenance
8. Procedures s sseeees 30 Drawing of Front Plate unsnnsenneenneennnannennnnnnnennnnannennnnannennnnennnnnn 33 Return Rep rt 22 22 ates ee Eee 35 Introduction Intended Use The AS608 AS608e screening audiometer is designed to be a device for screening for hearing loss Output and specificity of this type of device are based on the test characteristics defined by the user and may vary depending on environmental and operating conditions The screening for hearing loss using this kind of audiometer depends on the interaction with the patient Normal hearing result should not allow for ignoring other contra indications A full audiologic evaluation should be administered if concerns about hearing sensitivity persist The AS608 AS608e audiometer is intended to be used by an audiologist hearing healthcare professionals or trained technicians in a quiet environment It is recommended that the instrument be operated within an ambient temperature range of 15 35 degree Celsius 59 95 degrees Fahrenheit Extended Function The AS608e extends the AS608 functionalities with the following three extra features e PC Integration through the Diagnostic Suite software This enables audiograms to be transferred and displayed in the Windows software and stored in the OtoAccess or Noah databases The Diagnostic Suite also includes advanced reporting and printing features similar to the AC440 software module
9. an appropriated level of cleanliness Never insert or in any way use the insert NO TICE headset without a new clean non defect test tip p AS608 AS608e Operation Manual Page2 External equipment intended for connection to signal input signal output or other connector shall comply with relevant IEC standard e g IEC 60950 for IT equipment and the IEC 60601 series for medical electrical equipment In addition all such combinations systems shall comply with the standard 60601 1 1 Safety requirements for medical electrical systems Equipment not complying with IEC 60601 shall be kept outside patient environment as defined in standard at least 1 5 m from the patient Any person who connects external equipment to signal input signal output or other connectors has formed a system and is therefore responsible for the system to comply with the requirements of IEC 60601 1 1 If in doubt contact your service technician or local representative for help If connection is made to a standard PC which is powered through the mains network special precautions must be taken in order to maintain medical safety A standard USB cable can only be used if the connected PC is running on battery or medical approved or powered via a medical approved safety transformer In all other cases a galvanic separator must be inserted in the USB connection The AS608 AS608e is intended to be NO TICE powered from a PC as descr
10. anical properties are correct This should be made by an authorised workshop in order to guaranty proper service and repair Before the connection to the mains network be sure that the local mains voltage corresponds to the voltage labelled on the instrument Always disconnect the power cord if the instrument is opened or by control replacement of the mains fuses Observe that no damage is present on the insulation of the mains cable or the connectors and that it is not exposed to any kind of mechanical load which could involve damage For maximum electrical safety turn off the power from a mains powered instrument when it is left unused Do not site the instrument next to a heat source of any kind and allow sufficient space around the instrument to ensure proper ventilation To ensure that the reliability of the instrument is kept it is recommended that the operator at short intervals for instance once a day perform a test on a person with known data This person could be the operator him herself Aplastic cover can be provided to protect the instrument against the accumulation of dust The cover should only be used when the instrument is left unused with the power turned off If the surface of the instrument or parts of it is contaminated it can be cleaned using a soft cloth moistened with a mild solution of water and dish washing cleaner or similar The use of organic solvents and aromatic oils mu
11. cess the AS608 AS608e setup menu press F1 and F4 simultaneously for 2 3 seconds Fi Change setting F2 Browse up in the setup menu F3 Browse down in the setup menu F4 Save settings and Back to previous screen display see below for details Power up Tone Setup ES Power Up Ear Default Intensity 20 dB Change Save Press Change to toggle between Manual and Reverse Power up Ear Setup ES Power Up Tone Man Default Intensity 20 dB Change Save Press Change to toggle between Right and Left ear as the default ear for Power Up Default Intensity Change AS608 AS608e Operation Manual Page14 The default intensity when changing ear side Choose between Off 10dB 5dB OdB 5dB 10dB 15dB 20dB 25dB 30dB 35dB 40dB 450B and 50dB Intensity Steps Setup ES Intensity Steps 5 dB Power Off Change Save Choose Between 1 dB and 5 dB Power Off setting Power Up Ear Right f Pulse Length 250mS I Change Save Press Change to toggle between Never 1 2 3 4 or 5 minutes Pulse Length Press Change to toggle between 250msec and 500msec Lanquage Pulse Length 5005 LCD Contrast o E Change Save AS608 AS608e Operation Manual Page15 Press Change to toggle between English German Spanish and French LCD Contrast 2 Language En d Frequencies E Change Save Press Change to toggle between settings rangin
12. eard threshold point F3 Display the L R thresholds stored in the internal memory of the AS608e Hz 125 2506 500 750 R 20 L 20 Del All ES 20 20 20 20 Back F4 Start the Hughson Westlake HW automatic test procedure Please refer to the next chapter for instructions about how to setup the HW test Display A B C AS608 AS608e Tone A tone presentation indicator is provided in the top left corner of the display header AA 30 dB 1000 Hz 30 dBu 1000 Hz Sen Left Pulse Warble Response When using the APS3 response button a response is indicated in the middle of display header 30 dB 1000 Hz 30 dBu 1000 Hz Power On or Battery status The power status of the AS608 AS608e is indicated in the top right corner of the display header The icon will change depending on whether the instrument is powered via an external source power supply or USB connection to computer or batteries Operation Manual Page12 When powered by batteries the battery icon will change depending on the battery power level When batteries are running low the display will read Low Battery and flash The Power Off settings of the instrument can be adjusted at different time intervals or set to never power off please see Setup section for details 4 I 1 4 11 a 4 LI a 30 dBu 1000 Hz 30 dBu 1000 Hz Low Battery AA AS608 AS608e Operation Manual Page13 Setup Menu of AS608 AS608e To ac
13. ed to abnormal low temperatures the warm up time must be respectively prolonged Care and Maintenance The performance and reliability of the AS608 AS608e will be prolonged if the following recommendations for care and maintenance are adhered to Using an external power Supply e g ASA30M 0301 Turn the switch to the off position Great care when handling the headset Great care should be exercised when handling the headset as dropping it may alter the calibration Annual calibration headset The AS608 AS608e has been designed to provide many years of reliable service but annual calibration is recommended We do also recommend to calibrate the AS608 AS608e if something drastic happens to part of it e g headset is dropped AS608 AS608e Operation Manual Page27 Trouble Shooting AS608 AS608e does not turn on Using External Power Supply The power cable must be correctly connected to the mains The mains switch must be on and the power switch on the external power supply must also be on If still nothing happens a fuse in the external power supply may be blown Replace fuses with exactly the same type Using Batteries The batteries might need to be changed an indication on the top right corner of the display will be provided and the operator prompted on the status via a flashing screen External Power Cable connected to AS608 AS608e will disconnect batteries unplug cable for battery operation No tones in t
14. g from 0 very bright to 6 very dark HW Test only on AS608e Setup ES LCD Contrast Frequencies Change Save Press Change to go to the Hughson Westlake HW automatic test procedure setup Setup ES HM Familiarization Off HW Condition KEE Hl Frequencies Change Save Press Change to toggle between Familiarization On Off Familiarization is used to train the patient Setup ES HM Familiarization off HM Condition 2 3 Hl Frequencies Change Save Press Change to toggle between 2 correct out of 3 answers and 3 correct out of 5 answers The conditions used before going to the next frequency AS608 AS608e Operation Manual Page16 Setup ES Hu 125 Hz Hu 250 Hz H 250 Hz Off Change Save Select the frequencies to include in the HW test Press Change to toggle between frequencies On Off Press Save to return to the main HW setup menu Frequencies Press Change to access the default frequency range from 125Hz to 8 kHz for daily operation On KH e Change Sav 7 frequencies are available to change 125 250 750 1 500 3 000 6 000 and 8 000 Press Change to toggle between On or Off Press Save to return to the main setup menu License O About hange Save AS608 AS608e Operation Manual Page17 Press Change to access the license key of the AS608 AS608e instrument 00341464 HUG8ZTSE3HKDO2D3GMH DK
15. he TDH39 headphone Left F1 or Right F2 ear must be selected The Attenuator 2 must be turned up The Tone presentation signal A must be activated by touching the Tone Switch If still no sound appears check that the headphone is correctly connected to the phone outputs AS608 AS608e Operation Manual Page28 Dictionary Explanation English er Right AS608 Selects Right headphone AS608e AS608e Toggles between right Right Left and left headphone AS608 Left AS608 Selects Left headphone AS608e Store AS608e Stored the selected threshold in the internal memor F3 Man Pulse Select Man to have the tone presented when Tone Switch is activated Select Pulse to present pulsing tones when the Tone Switch is activated F4 Pure Tone Select Pure tone or Warble tone as Warble stimulus Selects stimulus frequency HL dB Adjustment of Intensity Tone Switch Presents stimulus A Display Indicates presentation B Display Indicates response from patient C Display Power On Indication of Power Battery status Battery Low AS608 AS608e Operation Manual Page29 Appendix General Maintenance Procedures The performance and safety of the instrument will be kept if the following recommendations for care and maintenance are observed Itis recommended to let the instrument go through at least one annual overhaul to ensure that the acoustical electrical and mech
16. ibed above from batteries or from a medical power supply type ASA30M 0301 Using other supplies is not allowed Do not site the AS608 AS608e next to a NO TICE radiator or any other heat source Allow six inches between the back panel and the wall to ensure proper ventilation In operation the instrument should not be NO TICE subject to temperatures below 15C or above 350 If the instrument is moved from AS608 AS608e Operation Manual Page3 a cold location to a warmer one there will be a risk of condensation If condensation occurs the instrument must be allowed to achieve normal temperature before it is turned on Although the instrument fulfils the relevant NOTICE EMC requirements precautions should be taken to avoid unnecessary exposure to electromagnetic fields e g from mobile phones etc If the device is used adjacent to other equipment it must be observed that no mutual disturbance appears To avoid damage to the instrument and NO TICE leakage from the batteries please remove the batteries if the instrument is unlikely to be used for some time It is important that instructions set forth in NO TICE this manual are followed closely in order to maintain the safety and full functionality of the instrument NO TICE External power supply through USB socket Within the European Union it is illegal to dispose electric and electronic waste as unsorted municipal waste Electric and electronic waste may contain hazardous s
17. nds The audiometer will also automatically power off after 1 2 3 4 or 5 minutes depending on the settings see next section Pure Tone Presentation 1 Select desired frequency with the Frequency button 2 Select desired intensity with the HL dB 3 Present tone by touching Tone Switch An indication will be on Display see below AS608 AS608e Operation Manual Page10 F1 On AS608 Select the Right ear On AS608e Toggle between Right and Left F2 On AS608 Select the Left ear On As608e Store threshold F3 Manual or Pulse Manual Manual Tone presentation as long as the Tone Switch is activated Pulse Pulsing Tone will be presented as long as the Tone Switch is activated F4 Pure Tone or Warble If Tone is selected pure tones will be presented to the subject when the Tone Switch is activated If Warble is selected warble tones will be presented to the subject when the Tone Switch is activated AS608e Special Functions Talk Forward On the AS608e Talk Forward is activated by holding down the HL db 3 rotary wheel 4 ES 60 dBu Talk FW Right While holding down the The Talk button 3 the talk forward level can be adjusted The following F key functionalities can be access by pressing the frequency rotary wheel 1 A Il ES 20 dB 1000 Hz Del All Not H Thres Hi F1 Delete all thresholds stored in the internal memory of the AS608e AS608 AS608e Operation Manual Page11 F2 Store a Not H
18. ny incidental indirect or consequential damages in connection with the purchase or use of any Interacoustics product This shall apply solely to the original purchaser This warranty shall not apply to any subsequent owner or holder of the product Furthermore this warranty shall not apply to and Interacoustics shall not be responsible for any loss arising in connection with the purchase or use of any Interacoustics product that has been e repaired by anyone other than an authorized Interacoustics service representative e altered in any way so as in Interacoustics judgement to affect its stability or reliability e subject to misuse or negligence or accident or which has had the serial or lot number altered effaced or removed or AS608 AS608e Operation Manual Page5 e improperly maintained or used in any manner other than in accordance with the instructions furnished by Interacoustics This warranty is in lieu of all other warranties express or implied and of all other obligations or liabilities of Interacoustics and Interacoustics does not give or grant directly or indirectly the authority to any representative or other person to assume on behalf of Interacoustics any other liability in connection with the sale of Interacoustics products INTERACOUSTICS DISCLAIMS ALL OTHER WARRANTIES EXPRESSED OR IMPLIED INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FOR FUNCTION OF FITNESS FOR A PARTICULAR PURPOSE OR APPLICATION AS6
19. ontrolled Hughson Westlake procedure according to ISO 8253 1 Store Function Soft key F key store button and internal memory for AC L R Stored Measurements can be viewed on the build in display or transferred to the PC using the Diagnostic Suite Audiogram software module PC Software Interface The Diagnostic Suite PC software with advanced reporting and printing features OtoAccess and Noah compatible Distortion 0 3 typical at full intensity 1 maximum at full intensity Rise fall Times 35 msec typically Display Header Indicators Tone On Patient Response Power Battery Status Batteries 3 AA size Automatic battery on off switching Automatic battery status indication Battery life Standby 6 months Tone presentations 70 000 AS608 AS608e Operation Manual Page20 External Power Supply though USB connector Accepts 5 VDC minimum 150 mA The recommended ASA30M 0301 100 240 VAC 0 8 0 4 Amp is approved with the AS608 AS608e Construction Plastic cabinet Dimensions WxDxH 22 5 x 18 x 5 5 cm 8 9 x 7 1 x 2 2 inches Weight 1 0 kg including batteries and headset 1 6 kg including TC608 carrying bag incl peltor noise reducing headset audiogram charts etc Operating Environment Temperature 15 35 C 59 95 F Relative Humidity 30 90 Storage Environment Temperature 0 50 C 32 122 F Relative Humidity 10 95 Transport Environment Temperature 20 50 C 4 122 F
20. primary practice clinics In this instance you would follow the same familiarization and instruction procedures as stated above but present a single dB level i e 25dB at just 4 frequencies 500 1000 2000 amp 4000 Hz in each ear In this instance you simply record a response or no response to the single tone presentations at each frequency AS608 AS608e Operation Manual Page8 Auto Threshold In addition to traditional manual testing the AS608e incorporates a Hughson Westlake patient controlled automatic threshold test complying with ISO 8253 When the test is completed the results are easily recalled from the internal memory of the AS608e and transferred to the Diagnostic Suite PC software and stored in OtoAccess or Noah Hughson Westlake is an automatic pure tone test procedure Threshold is defined as 2 out of 3 or 3 out of 5 correct responses at a certain level in a 5 dB increase and 10 dB decrease test procedure The Hughson Westlake is used to obtain pure tone thresholds automatically Talk Forward The Talk Forward function makes the AS608e easy to work with particularly in sound booth installations AS608 AS608e Operation Manual Page9 Functions of Buttons amp Display The AS608 AS608e front plate Power Up and Power Off To turn on the audiometer press the Tone Switch 3 button To power off the audiometer hold down the two rotary wheel buttons 1 and 2 simultaneously for a few seco
21. rnal power supply the power supply must be CE medical approved When AS608 AS608e is supplied with the external power supply model EPS11 write down the serial number located on its bottom plate Reporting Imperfections Inspect before connection Prior to connecting the AS608 AS608e to the mains it should once more be inspected for damage All of the cabinet and the accessories should be checked visually for scratches and missing parts Report immediately any faults Any missing part or malfunction should be reported immediately to the supplier of the instrument together with the invoice serial number and a detailed report of problem In the back of this manual you will find a Return Report where you can describe the problem Please use Return Report Please realise that ifthe service technician does not know what problem to look for he may not find it so using the Return Report will be of great help to us and is your best guarantee that the correction of the problem will be to your satisfaction AS608 AS608e Operation Manual Page26 Operating Temperature Keep away from heat Do not site the AS608 AS608e next to a radiator or any other heat source Allow six inches between the back panel and the wall to ensure proper ventilation Operating temperature 15C 35C 59 95 F In operation the instrument should not be subject to temperatures below 15C or above 35C below 59 F or above 95 F If it has been expos
22. shold Determination The test normally starts at 1000 Hz on the patient s better ear with the L R switch adjusted accordingly AS608 AS608e Operation Manual Page7 Familiarization Present a tone at 1000 Hz which can easily be perceived i e 50dB If necessary increase with steps of 10 dB until the tone is clearly perceived Threshold Determination The hearing threshold is defined as the lowest level at which more than half of the stimuli are heard This threshold is found by the following procedure 1 Presenta tone which is 10 dB lower than the level at which familiarization was finished 2 Decrease the level in steps of 10 dB until response fails 3 Increase the level in steps of 5 dB until the subject responds again 4 Repeat 2 and 3 two or three times until the threshold appears at the same level The time intervals in between the stimuli should be varied to prevent the subject to react on the rhythm 5 Change to the next frequency and repeat the procedure until all frequencies are measured Repeat the procedure at 1000 Hz If the difference to the previously found threshold is then 5dB or less go to the other ear If the difference is 10 dB or higher repeat the test at the other frequencies until agreement to 5 dB or less has been obtained 6 Proceed until both ears have been tested Screening Procedure It is common to test at one dB level for preliminary hearing screenings as is often done in schools and
23. st be avoided Always disconnect the mains conductor during the cleaning process and be careful that no fluid is entering the inside of the instrument or the accessories AS608 AS608e Operation Manual Page30 After each examination of a patient it should be ensured that there is no contamination on the parts in connection with the patient General precautions must be observed in order to avoid that disease from one patient is conducted to others If ear cushions or eartips are contaminated it is strongly recommended to remove them from the transducer before they are cleaned By frequent cleaning water should be used but by severe contamination it may be necessary to use a disinfectant The use of organic solvents and aromatic oils must be avoided Great care should be exercised by the handling of earphones and other transducers as mechanical shock may cause change of calibration AS608 AS608e Operation Manual Page31 AS608 AS608e Operation Manual Page32 Drawing of Front Plate AS608 AS608e Operation Manual Page33 AS608 AS608e Operation Manual Page34 Return Report Form 001 Opr dato af Rev dato 2003 02 24 EC 2006 11 13 Address Drejervaenget 8 Company 5610 Assens Denmark Address Phone 45 63713555 Fax Phone 45 63713522 r E mail Fax or e mail info interacoustics com Contact person Date Following item is reported to be O returned to INTERACOUSTICS for
24. ubstances and therefore has to be collected separately Such products will be marked with the crossed out wheeled bin shown below The cooperation of the user is important in order to ensure a high level of reuse and recycling of electric and electronic waste Failing to recycle such waste products in an appropriate way may endanger the environment and consequently the health of human beings Disposal of batteries must be made according to national regulations AS608 AS608e Operation Manual Page4 INTERACOUSTICS warrants that e The AS608 AS608e is free from defects in material and workmanship under normal use and service for a period of 24 months from the date of delivery by Interacoustics to the first purchaser e Accessories are free from defects in material and workmanship under normal use and service for a period of ninety 90 days from the date of delivery by Interacoustics to the first purchaser If any product requires service during the applicable warranty period the purchaser should communicate directly with the local Interacoustics service centre to determine the appropriate repair facility Repair or replacement will be carried out at Interacoustics expense subject to the terms of this warranty The product requiring service should be returned promptly properly packed and postage prepaid Loss or damage in return shipment to Interacoustics shall be at purchaser s risk In no event shall Interacoustics be liable for a
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