MA 53 Operating Instructions

Operating Instructions MA 53

MAICO Diagnostic GmbH, Salzufer 13/14, D 10587 Berlin, Tel.: ++4930/70 71 46 50, Fax: ++4930/70 71 46 99MAICO Diagnostics, 7625 Golden Triangle Drive, Eden Prairie, MN 55344, Toll Free ++1/888.941.4201, Fax ++1/952.903.4200

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Table of Contents Page1. Introduction 22. Description 3

3. Getting started 53.1 Unpacking your instrument 53.2 Preparing the MA 53 for use 63.3 Getting familiar with your MA 53 73.3.1 Using the keyboard of the MA 53 83.3.2 The display of the MA 53 9

4. Pure tone audiometry 11 4.1 Air Conduction (AC) Testing 11

4.2 Uncomfortable Hearing Level (UCL) Testing 124.3 Bone Conduction (BC) Testing 134.4 Masking of the opposite ear 144.5 Diagnostic Tests 164.6 Dual Frequency Mode 214.7 High Frequency Audiometry (optional) 22

6. Speech Audiometry 236.1 Connecting the speech source (microphone, tape or CD-Player) 236.2 Speech Calibration 246.3 Connection and adjustment of the monitor phone 256.4 Speech Audiometry 266.5 Masking 27

7. Advanced features 28

8. Quick reference guide 31

9. Recommended literature 36

10. Computer interface 37

11. Care and Maintenance of the instrument 38

12. Trouble shooting 39

13. Technical data 40

14. Warranty, Maintenance and After-Sales Service 47

15. Safety Regulations 48

16. List for subjective instrument check 49

17. Certificate of conformity 50

18. Front panel layout and rear panel connections 52

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1 IntroductionThank you very much for purchasing a quality product from the MAICO family.The MA 53 audiometer is manufactured to meet all quality and safetyrequirements, and has been certified with the CE-symbol according to MedicalDirective 93/42/EEC.

In designing the MA 53 we placed particular importance in making it a user-friendly device, meaning its operation is simple and easy to understand. All built-in test signals are generated by a digital signal processor (DSP) which allows toimplement new test signals just with a software upgrade. And because MA 53functions are software controlled, upgrading later to new, extendedmeasurement functions will be simple and inexpensive. That means that you haveinvested in a device that will correspond to your future needs.

This user manual should make it as easy as possible for you to become familiarwith the functions of the MA 53. Please open out the flap of illustrations on thelast page. The description of the position (e.g. ! ) of controls, displays andconnections, found again in the text, will make it easier for you to learn how tooperate the MA 53.

If you have problems or have ideas for further improvements, please get in touchwith us. Simply call.

Your MAICO-team

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2 DescriptionThe MA 53 is a real two-channel audiometer for advanced pure tone andspeech audiometric tests. It can be used for ENT diagnostics and hearing aidfittings in the office, and for mobile audiometry in clinics, homes and aboard.

Tests can be performed using the TDH 39 headphones (AC), the optional highfrequency headphones HDA 200, B 71 bone conduction receiver (BC) or optionalinsert phones and loudspeakers (FF). Built-in test signals are pure tone, pulsetone, warble tone, narrow band and broadband noise. All signals and testfrequencies are individually adjustable on both channels. The MA 53 hasstereophonic microphone inputs for live speech audiometry, an input for anoptional tape/CD player with speech test material and an additional input for asecond tape/CD player (i.e. for external masking signals).

The MA 53 audiometer with the standard TDH 39 delivers 12 air conduction (AC)test frequencies from 125 Hz to 12 kHz, with levels from -10 dBHL to 120 dBHL.With the optional high frequency HDA 200 it delivers 17 air conduction (AC-HF)test frequencies from 125 Hz to 16 kHz, with levels from -20 dBHL to 120 dBHL. Bone conduction (BC) can be tested with 11 test frequencies from 125 Hz to8 kHz with levels from -10 dBHL to 70 dB HL (with the standard bone conductorB 71 the frequency range is limited from 250 Hz to 6 kHz).

The optional insert phones EAR 3A submit levels from -10 dBHL to 120 dBHL with11 test frequencies from 125 Hz to 8 kHz.

Optional loudspeakers are available for free sound field measurements (FF). Thenew, portable loudspeakers MAICO SBC have a dynamic range from -10 dBHL to80 dBHL at 1m distance, for nine test frequencies from 500 Hz to 8 kHz. Thefrequency range for speech is 500 Hz to 8 kHz with levels up to 80 dBSPL. The loudspeakers Canton Plus XL (not available in the USA), deliver levels up to90 dBHL at 1m distance over the entire frequency range from 125 Hz to 8 kHz.The MA 53 has also separate line level outputs for an external amplifier.

The hearing level is controlled independently for each channel by two detenteddials on the left and right of the instrument which can be operated from the sideor the top. The level steps are 5 dB and can be changed to 2 dB or 1 dB. Thesignal STIM bar and the frequency up/down keys are just beside the level controlknobs for easy one handed control of level, frequency and signal presentation.

The large backlighted LCD-display shows level, frequency, transducer, signal andother information for each channel.

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As a result of modern microprocessor technology, the MA 53 is easy to use andis extremely reliable. The audiometer is designed to be extremely service friendly. Automatic testprograms 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 and PAX enables theautomatic data transfer of all test results of the MA 53, like speech audiogramand ABLB, DLI, SISI, tone decay etc. For more information see chapter 10.

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3 Getting started3.1 Unpacking your instrument

Your MA 53 was carefully inspected and packed for shipping. However, it isa good practice to thoroughly inspect the outside of the shipping box forsigns of damage. If any damage is noted, please notify the carrierimmediately.Carefully remove the instrument from the shipping box. Remove the plasticbag from the instrument and inspect the case for any damage.Notify the carrier immediately if any mechanical damage is noted. This willassure that a proper claim is made. Save all packing material so the claimadjuster can inspect it as well. Notify your dealer or MAICO when theadjuster has completed the inspection.

SAVE ALL THE ORIGINAL PACKING MATERIAL AND THE SHIPPINGCONTAINER SO THE INSTRUMENT CAN BE PROPERLY PACKED IF IT NEEDSTO BE RETURNED FOR SERVICE OR CALIBRATION.

All accessories are already packaged in the compartment connected with theMA 53. Please check that all accessories listed below are received in goodcondition. If any accessories are missing or damaged, immediately notify yourdealer or MAICO.

Standard accessories:- 1 Headphone TDH 39- 1 Bone conduction receiver B 71 with headband- 1 Patient resonse 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 optionalinsert phone and loudspeaker match one another and have the same serialnumber (e.g. 6631520). As they have been calibrated with this particularinstrument, using of other transducers is not allowed. If one of the acoustictransducers is replaced, the instrument must be recalibrated.

The use of non-calibrated audiometers leads to incorrect measurements!

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Picture 1 Transport of MA 53

Picture 2 MA 53 with open cover

Picture 3 MA 53 in operation

3.2 Preparing the MA 53 for use

The MA 53 with its integrated compartment for theaccessories is perfect for portable use. The ruggedhousing, light weight and the comfortable handlingmake it easy and convenient to transport theinstrument. Carry it, as shown, with the bottom awayfrom the leg. That helps protect the front cover fromdamage, and due to the asymmetrical handle positionit provides more space for your leg. To get started first move the handle under thehousing. Unlatch the cover by pressing in the twoblack locks located on the left and right sides near thefront of the instrument. Open the front cover and restit on the back cover of the accessory compartment. Toopen the compartment, press the two black locks inthe upper middle of the instrument. Open thecompartment cover as seen in picture 2. Take theheadphone, the bone conduction receiver, the patientresponse switch and the microphone out of thecompartment and connect the power cable to power.The MA 53 operates with voltages from 100 to240 V~ AC, 50/60 Hz. To avoid pinching the cableswhen closing the cover, lay the cables in the slotsprovided. Close the back cover and latch it with slightpressure. You can place the microphone or a tape orCD-player on top of the cover (see picture 3).The MA 53 should be operated in a quiet room, sothat the audiometric examinations are not influencedby outside noises. For use in noisier environmentsheadphones with optional sound insulation muffs areavailable.Electro-medical instruments, which emit strongelectromagnetic fields (e.g. microwaves - radiotherapydevices), can influence the function of the audiometer.Therefore the use of these instruments is not allowedin close proximity to the audiometer.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 firstmeasurement to guarantee precise measuring results. If the device has beencooled down (e.g. during transport), please wait until it has warmed up to roomtemperature.

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HL 30 dB L 1000 Hz R 30 dB Air Air Tone Tone

Picture 4 MA 53 power switch, display andselection buttons for left and right channel

Picture 5 MA 53 display with initial settings

Picture 6 MA 53 level and frequency control

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3.3 Getting familiar with your MA 53Turn on the instrument with thepower switch " which is located atthe right side of the MA 53. Thedevice performs its initial test andautocalibration. If an error is detectedthe test is stopped and a description ofthe error is shown on the LCD-display #. In this case please contactyour local dealer or service.If the test is passed, the instrument issetup to air conduction and pure tone.The corresponding LED's above thereceiver selectors $ and % and thesignal selectors & and ' are lighted.The frequency is set to 1 kHz and thelevel to 30 dBHL for both channels. Allthese settings are also shown on thedisplay # (see picture 5).The hearing level can be easily adjustedindependently for each channel with aknob ( and ) on each side of theinstrument. For optimal conveniencethese level control knobs are usablefrom the top or the side of theinstrument. They are detented in 5 dBsteps (adjustable to 2 dB or 1 dB). Thesignal STIM bars * and + are locatedbeside the level control knobs (, ).The signal LED's , and - light upwhen the signal is presented. You canchange from presenter to interrupterfunction with the STIM MODE button.. The corresponding LED lights whenthe interrupter is selected. Thefrequency is changed with up /, 0and down !, 1 buttons for bothchannels. The design of the MA 53makes it easy to control level, signalpresentation and frequency with onehand.

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Picture 7 MA 53 keyboard

3.3.1 Using the keyboard of the MA 53All main functions of the MA 53 are directly accessable by pressing a singlebutton. Not frequently used procedures like the calibration of the speech sourceor the level step selection are hidden as a �second level function�. To select thisfunction just press the addressed button more than two seconds. A user menufor the customization of the MA 53 is available for advanced users (seechapter 8).Please find below the description ofthe main and second level functions ofeach button: / left (blue) channel frequency up:

change to next higher frequencyPress the frequency up and down buttonssimultaneously to enter / exit the dualfrequency mode

! left (blue) channel frequency down:change to next lower frequencyPress the frequency up and down buttonssimultaneously to enter / exit the dualfrequency mode

2 left (blue) talk over microphone:switches on the talk over micro-phone as long as the button ispressed. The level can be adjusted with the knobs ( or ). The actual value isdisplayed in dBHL 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). Thelighted LED above shows the current selection. 2nd level: selects test mode HL, UCL, MCL for selected receiver (see chapter 4.2)

3 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 orswitches the channel off. 2nd level: calibration of tape/CD or live voice microphone (see chapter 6.2)

4 pulse tone:enables pulsing of pure tone or warble tone. 2nd 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

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Picture 8 MA 53 keyboard

HL 70 dB L 1500 Hz R 90 dB Bone Warble Air Tone NB-Noise Tracked

Talk Over70 dB

Picture 9 MA 53 display for BC-test

affects both channels.

5 swap function:exchanges the outputs for both ears (i.e. the right controls now affect the leftear).

6 tracking function: enables the automatic tracking (see chapter 4.4 Masking). 2nd level: enters level step selection menu. The actual level step is displayed at the lowercenter of the LCD-display #. Choose the level steps with the frequency up/down buttons1and 0

' right (red) channel signal selector key:changes the test signal from pure tone to tape/CD or microphone or noise orswitches the channel off. 2nd level: adjustment of talkback microphone and monitor phone (see chapter 6.2)

% right (red) channel receiver selector: changes the receiver from AC to BC or FF or INSERT (if option assembled). Thelighted LED above shows the current selection. 2nd level: selects test mode HL, UCL,MCL for selected receiver (see chapter4.2)

7 right (red) channel talk overmicrophone:switches on talk over microphoneas long as the button is pressed.The level can be adjusted with theknobs ( or ). The actual value isdisplayed in dBHL at the lowercenter of the LCD-display #.

1 right (red) frequency down:changes to next lower frequency

0 right (red) frequency up:changes to next higher frequency

3.3.2 The display of the MA 53The large backlighted graphical LCD-Display # of the MA 53 shows allactual settings and test results. Thedisplay area is split with a line into anupper or main area and a lower oradvanced area (see picture 9). Themain area shows the individual settings for the left channel on the left and theright channel on the right. General settings which affect both channels aredisplayed in the middle. The example picture 9 shows a typical setting for a BC-

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Picture 10 MA 53 display for speech test

SRT 60 dB L 60% R 60 dB Air Correct: 6 Air Tape/CD Wrong: 4 Speech-Noise

threshold test. The left channel is bone conduction with 70 dBHL , tone andtracking function enabled. The right channel is set to 90 dBHL narrow band noisewith air conduction for masking. The test frequency is 1500 Hz and the testsignal is a warble tone. The lower section of the display shows that the talk overmicrophone button 2 or 7 is pressedand the audiologist talks to the patientwith 70 dBHL. The HL in the upper rowbefore 1500 Hz indicates that thecurrent measurement is stored asHearing Level (threshold) test.Picture 10 shows the display for aspeech test with speech test material from tape or CD of the left ear and maskingof the opposite ear. The left part of the LCD-display # shows the settings for theleft channel:

level = 60 dBHL, receiver = AC, signal = tape/CD.The middle of the LCD-display # 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).

The LCD-display # has an energy saver function: the backlight of the display isautomatically switched off after approximately three minutes. Any action withthe MA 53 such as pressing a button or turning the knobs switches the backlighton again immediately.

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Picture 11 Headphone

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Picture 12 MA 53 controls and display for airconduction threshold test of the left ear

4 Pure tone audiometry

4.1 Air Conduction (AC) Testing

In the hearing threshold test, the hearing threshold of the patient is measured incomparison to the normal hearing threshold for air conduction. The test is startedon the ear with better hearing.- The patient should sit at a distance of at least 1 m from the device.- Eliminate any obstructions which will interfere with the placement of the

earphone cushions on the ear (i.e. hair, eyeglasses).- Ensure that the headphones are put on correctly. Red

side on the right, blue side on the left. Adjust theheadband of the headphones so that the receivers areat the correct height (the sound output grid 8 exactlyfacing the ear canal).

- Start with the �better� ear at 1 kHz. (After switchingon, the frequency is automatically set to 1 kHz.) In thefollowing 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 thepatient response switch if he justhears the test tone.

- Press the STIM bar * for acertain time to present the testtone. The STIM LED , shouldlight on.

- If the patient hears the test tone,the patient response displaylights red. In this case decreasethe level with the level controlknob ( . Proceed withpresenting the test signal asdescribed before.

- If the patient doesn't hear the test tone, increase the level with the levelcontrol knob (. Proceed with presenting the test signal as describedbefore.

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HL 60 dB R 1500 Hz L 30 dB Air Warble Air Tone Pulse Tone

Picture 13 MA 53 display for AC-test withenabled SWAP function, Pulse and Warble tone

- When you find a stable threshold value, note the level and frequency. If theMA 53 is connected to a PC, the value was stored with your last STIMpresentation.

- Test through the frequencies. Starting at 1 kHz, set the higher frequenciesfirst then the lower frequencies.

- Use the frequency up key / or 0 to select the higher frequencies and usethe frequency down ! or 1 to select the lower frequencies.

- Select the next frequency, increase the level again and proceed withpresenting the test signal as described before.

- Once all frequencies are tested choose the poorer ear and repeat thehearing threshold test. You can do this with the corresponding controls onthe other side or just by pressingthe SWAP button 5. The SWAPfunction enabled means that youmeasure the right ear using thecontrols on the left side. Theouput to the left and rightearphones are exchanged. Also,the left and right display text isexchanged (see picture 13).

- The correct marks in an audiogram are: O (red) = right and X (blue) = leftPulse tone: If required, the test can also be performed with a pulsed tone.Press the PULSE button 4 and the pure tone will be switched 0.25s on and0.25s off. Warble tone: If required, the test can also be performed with a warbletone. Press the FM button 3 and the pure tone will modulate frequency.The warble tone can also be pulsed as described before.For hygienic reasons it is important to clean the ear cushions of theheadphone (see chapter 11).

4.2 Uncomfortable Hearing Level (UCL) Testing

Testing of UCL can be measured using pure tone stimuli or speech (live voiceor tape/CD). The purpose is to determine the dB level at which the stimulibecomes uncomfortable to the patient. This information is valuable fordetermining the patient's upper dynamic range limit for proper hearing aidfittings and for determining symptoms of recruitment.Warning! Because this test uses high sound pressure levels, it isextremely important to perform this test using the utmost caution toavoid damaging the ear. To prevent the possibility of extremediscomfort by the patient, it is important to start the test with levelsnear the patient�s MCL (Most Comfortable Level).

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UL 60 dB L 1000 Hz R 30 dB Air Air Tone Tone

Picture 14 MA 53 display for UCL-test left

Picture 15 Bone conductor

Picture 16 Correct seating of the bone conductor

The UCL level is described as the level between very loud and loud perception ofthe test signal.- Press the receiver selector button

$ or % longer than 2 seconds.The LCD-display in the upper rowchanges from HL to UL (seepicture 14).

- Start as described in chapter 4.1with a test level of 60 dBHL.

- 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 accordingly with other test frequencies.

For hygienic reasons it is important to clean the ear cushions of theheadphone (see chapter 11).

4.3 Bone Conduction (BC) TestingBone conduction, i.e. the transmission of soundwaves through the skull directly to the inner earconveys information about the function of theinner ear. For a neural hearing loss the values ofair conduction (chapter 4.1) and boneconduction are the same. In this case a hearingloss of the middle ear can be eliminated.- Place the bone conduction receiver so that the flat, circular side of the

transducer Y is placed on the mastoid, atthe noticeable ledge of the cranial bonebehind the auricle (see picture 16). Theother side of the headband is placed infront of the opposite ear.

- Set the receiver selector $ or % to BC andthe signal selector & or ' to TONE.

- Perform the test the same way as for airconduction (see 4.1). Enter themeasurements for all frequencies on theform, connect all points with dotted linesmarked on the audiogram form as follows:

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> = right and < = leftFor hygienic reasons it is important to clean the bone conductor (seechapter 11).

4.4 Masking of the opposite earThe basics of masking are explained below. To begin testing immediately,please go directly to 4.4.3 Manual masking.

4.4.1 Crossover:When measuring a pure tone audiogram you assume that the measuredhearing threshold is correct. But if you recognize that sound is alsotransmitted through bone conduction over the entire skull it is probablethat the opposite ear has also received sound. This is called �crossover�.Crossover can also occur when measuring air conduction because the testtone is received by the skull and transmitted by bone. Whether thecrossover signal can be heard by the opposite ear depends on its inner earfunction.Relevant to crossover is the sound level which is received by the oppositeear. The difference between the original test signal at the test ear and thereceived signal at the opposite ear is called �interaural attenuation�.For bone conduction measurement the interaural attenuation is 0 to 15 dB.Bone conduction crossover is therefore possible even with a slightdifference in hearing loss between ears. Important: Please advise the patient to tell you in which ear he hears thetest 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 theopposite ear. Masking increases the hearing threshold of the opposite ear.The masking is done with a noise signal which is transmitted by theheadphone. For pure tone audiometry a narrowband noise is used. Thisnoise changes its center frequency according to the frequency of the testsignal.

4.4.3 Manual masking: If you have to mask use the common masking rules. See chapter 9 forrecommended literature.Masking is an important part of practical audiometry. It is necessary to befamiliar with this topic to avoid errors which would lead to a wrongdiagnosis.

- For the opposite ear set the receiver selector $ or %to AC and the signal selector & or ' to NOISE.

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Picture 18 Correct seatingof the bone conductor

HL 45 dB L 1000 Hz R 65 dB Bone Air Tone NB-Noise Tracked

Picture 19 MA 53 display for bone conduction with masking and enabled tracking function

- Adjust the required masking level with the levelcontrol knob ( or ).

- Notice that the masking sound is continuouslypresented for effective masking. You can interruptthe masking signal by pressing the correspondinginterrupter key * or +.

- To mask when performing bone conduction testing,place the headphone on the opposite ear so that thereceiver is at the correct height (the sound outputgrid 8 exactly faces the ear canal). Adjust theheadband of the headphones. The receiver on theside where the bone conductor is placed should beseated directly on the cheek bone. The marking for air conduction with masking shouldbe done with the symbols 9 = the right side and := the left side on the audiogram form. The markingfor bone conduction with masking should be donewith the symbols [ = the right side and ] = the leftside on the audiogram form.

4.4.4 Automatic masking: With the manual masking, as described before, you have to readjust themasking level every time you change the test signal level. The MA 53 has atracking feature for easy masking.

- Adjust the test signal using thelevel control knob ( or ), thenwith the opposite level controlknob ) or ( adjust thecorresponding masking level.

- Now press the TRACK button 6.The masking level is automaticallychanged if you adjust the testsignal level (e.g. if the test level was 30 dB and the masking level 50 dB andif you change the test level to 45 dB the masking level is automaticallyadjusted to 65 dB).

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HL

0.5

70 dB L 1000 Hz R 30 dB Air Air Tone Tone ABL 1.0 sec SISI DLI 4.0 3.0 2.0 1.5 1.0 0.5 dB

Picture 20 MA 53 display with suprathreshold menu

HL 50 dB L 2000 Hz R 50 dB Air Air Tone ABL 0.5 s Tone

Picture 21 MA 53 display with ABLB test

4.5 Diagnostic Tests4.5.1 Suprathreshold tests

The MA 53 offers additional suprathreshold tests which can offer moreinformation about the kind of the hearing loss. To access suprathreshold testspress the PULSE button 4 longerthan two seconds. Thesuprathreshold test menu is nowdisplayed on the lower part ofthe LCD-display # (seepicture 20). The actual choice isdisplayed inversely. You cantoggle through the different options by briefly pressing the PULSEbutton 4. Start the chosen option by pressing the STIM bar * or +.

4.5.1.1 The ABLB (Fowler) TestThe Alternate Binaural Loudness Balance test is a recruitment test whichuses the presentation of alternating tones between the two ears withheadphones. The intensity of the tone in the hearing-impaired ear is varieduntil the loudness of the tone is judged by the patient to be equivalent to atone at a constant intensity in the normal ear. This is called loudnessbalance. 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 thesuprathreshold menu (as decribed before under 4.5.1) and press the STIMbar * or +.

- On the LCD-display # ABL isshown with the chosen modu-lation time (see picture 21).

- Adjust the desired hearing levelsfor both the normal ear and theimpaired ear using the levelcontrol knobs ( and ).

- Press the STIM MODE button . to present the signal continuously. - 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 isequal.

- Note the levels and proceed with other levels and frequencies as required.- To exit the test briefly press the PULSE button 4.

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HL 50 dB L 2000 Hz R 50 dB Air Air Tone DLI 1.5 dB Tone

Picture 22 MA 53 display with DLI test

Picture 23 MA 53 display with SISI conditioning 5 dB

HL

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65 dB L 2000 Hz R -10 dB Air Air Tone SISI Conditioning Tone

dB Presented: Detected:

4.5.1.2 The DLI (Lüscher) TestThe Intensity Difference LImen for loudness test (or Just NoticeableDifference, JND) is another recruitment test. A pure tone is amplitudemodulated at a rate of 2/second. The patient has to determine whether thissignal was steady or undulating (beating).

- To start the test select a modulation amplitude from 0.5 dB to 4.0 dB in thesuprathreshold menu (as decribed before under 4.5.1) and press the STIMbar * or +.

- The LCD-display # shows DLI,along with the chosen modu-lation amplitude (see picture 22).

- Now adjust the required testlevel with the level control knob( or ) and present the testsignal by pressing the STIM bar * or +.

- To exit the test briefly press the PULSE button 4.

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 intensityincrements. The continuous test tone is increased by 1 dB for a period of0.2 seconds every 4.8 seconds. Whenever the patient hears the increment,he/she presses the patient response switch. The SISI test information andthe test score are shown on the LCD-display #. The test will endautomatically after 20 presented increments. The score is expressed as apercentage of ratio of the increments heard to the delivered increments (allincrements heard = 100% - no increments heard = 0%). A high scoreindicates a cochlear impairment. A low score is related to normal hearing orconductive 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 4.5.1) and press the STIM bar * or +. The display # changes to theSISI conditioning screen (as shown in picture 23).

- Select the test frequency withthe frequency keys //! or1/0. For the test you shouldchoose the frequency where themaximum bone conductionhearing loss is measured asdescribed in chapter 4.3.

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HL

5 4 2

65 dB L 2000 Hz R -10 dB Air Air Tone SISI Conditioning Tone

Tone now Answer nowdB Presented: Detected:

Picture 24 MA 53 display with SISI conditioning 5 dB and presented increment

HL

1 0 0

65 dB L 2000 Hz R -10 dB Air Air Tone SISI Test Tone

dB Presented: Detected:

Picture 25 MA 53 display with SISI test

- Adjust the test level with the level control knob ( or ). The level shouldbe set to a value 20 dB above the individual hearing threshold (measuredunder chapter 4.1). It must reach at least 60 dBHL.

- Recognize that in the SISI mode the test signal is presented continuously.You can interrupt the test by pressing the STIM bar * or + for the timeyou 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 Training of the PatientOnly with careful training during the following conditioning phase a validtest result can be achieved.

- The training starts with amodulation level of 5 dB. Thatmeans a continuous tone, e.g.65 dBHL, is briefly increased every4.8 seconds for 0.2 seconds by5 dB, e.g. to 70 dBHL. During theincrement time the text �Tonenow� is shown on the lower area of the LCD display # (see picture 24).The text �Answer now� appears for approx. 1.5 seconds. During thisperiod the patient may respond. If he/she answers too early or too late theanswer will not be accepted by the MA 53.

- The number of detected increments is counted and shown on the lowerright area of the display. Furthermore, the number of presented incrementsis shown (see picture 24).

- When you are sure that the patient has understood the object of the test,press the the PULSE button 4. The modulation level will be changed to3 dB.

- If the patient has also understood this part of the test, press the PULSEbutton 4 again. The modulation level will be reduced to 2 dB.

4.5.1.3.3 SISI Test- If the patient has understood the test up to here, press the PULSE button

4 again to start the SISI test.- The LCD-display indicates SISI

Test (see picture 25) and themodulation level is adjusted to1 dB. Now 20 increments willbe presented to the patient.

- You can delay the test for the

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Picture 26 MA 53 display with SISI result

HL

420% 20

65 dB L 2000 Hz R -10 dB Air Air Tone SISI-Result Tone

Presented: Detected:

HL

550% 10

80 dB L 1500 Hz R -10 dB Air Air Tone SISI-Aborted Tone

Presented: Detected:

Picture 27 MA 53 display with aborted SISI test

time you press STIM bar * or +. This could be helpful in determining if thepatient malingers.

- The test will end automaticallyafter 20 presented increments.The number of detectedincrements is counted andindicated as percentage of thepresented increments (seepicture 26).

- If you are sure that the result ofthe test is consistent you canabort the test at any time bypressing the PULSE button 4.The result is then indicatedaccordingly (picture 27).

- Retrocochlear hearing impair-ment is represented by lowscores (< 25 %), cochlear defects by high scores (> 70 %).

- Press any button to leave the SISI test.

4.5.2 The Stenger TestThe Stenger test is conducted as a malingering test in cases of allegedhearing loss or unilateral deafness. It is based on the premise that whentwo tones of the same frequency are presented simultaneously into bothears, only the louder tone will be perceived.

- The patient with a feigned hearing loss will not be able to hear the quiettone, but will also not admit being able to hear the loud tone.

- Select the desired frequency with the frequency keys //! or 1/0 andadjust the sound intensities with the level control knobs ( and ).

- Present the tone with the STIM bars * and +.

- The easiest procedure is to present the desired frequency into to the betterear at a level of 10 dB above the threshold. At the same time present thesignal into the poorer ear (the one with the possible feigned loss) at a level10 dB below the admitted threshold. If there is a real loss in the poorer ear,the patient will be unaware of the signal in that ear and will respond onlyto the tone in the good ear. If the patient does not respond at all it is likelythat the admitted threshold is incorrect and you have a �positive� Stenger.

4.5.2 The Threshold Decay (Carhart) TestThis examination is conducted as a fatigue test in cases of sensitivity loss.

- Select the desired frequency with the frequency keys //! or 1/0.

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HL 35 dB L 500 Hz R -10 dB Air Air Tone Tone

Decay 0 10 20 30 40 50 60sec

Picture 28 MA 53 display withinitial tone decay test


Decay 0 10 20 30 40 50 60sec

Picture 29 MA 53 display with example tone decay test

- Adjust the sound level to a value of about 5 dB above the hearing thresholdwith the level control knob ( or ).

- Instruct the patient to start pressing the patient response switch when hehears a tone and to release the switch when he doesn't hear the toneanymore.

- Enter continuous tone presentation by pressing the STIM MODE button .to present the test signal or press the corresponding STIM bar * or +.

- The PAT response LED ; lightsand after two seconds a bar stopwatch with a scale from 0 to 60seconds appears on the lowerarea of the LCD-display # (seepicture 28).

- When the patient releases theswitch the bar of the stop watch stops and you can see the time the patientheard the tone (see examplepicture 29).

- If the time was less than 60seconds increase the level withthe level control knob ( or ) by5 dB.

- Press any button to erase thestop watch on the display # and start the test again.

- Continue this procedure until the patient can hear the tone at least for60 seconds.

- The threshold shift can be entered on the tone audiogram pad by drawinga wavy line under the selected frequency.

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HL 50 dB L 1000 2000 Hz R 50 dB Air Air Tone Tone

Picture 30 MA 53 display with dual frequency mode

HL 50 dB L 1500 Hz R 50 dB Air Air Tone Tone

Picture 31 MA 53 display with single frequency mode

4.6 Dual Frequency ModeThe MA 53 offers the dual frequency mode to the right and the left earwith different frequencies. This �true two channel� feature can be used todetect frequency disorders.

- To enable the dual frequency mode press the left frequency up key / andfrequency down key ! simul-taneously.

- The LCD-display # now showsthe test frequency of the leftchannel on the left (in examplepicture 30 1000 Hz) and the testfrequency of the right channel onthe right (in example picture 302000 Hz) of the center.

- Use the frequency up key / to select the higher frequencies and thefrequency down key ! to select the lower frequencies for the left channel.

- The frequencies of the right channel could be selected independent fromthe left with the frequency up key 0 and the frequency down key 1.

- To exit the dual frequency mode press the left frequency up key / andfrequency down key ! simultaneously again.

- The LCD-display # now showsthe test frequency for bothchannels in the center (inexample picture 31 1500 Hz).

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Picture 32 MA 53 display for high frequency audiometry


4.7 High Frequency Audiometry (optional)The optional High Frequency Audiometry offers tone audiometry with theadditional test frequencies 9000 Hz, 10000 Hz, 11200 Hz, 12500 Hz,14000 Hz and 16000 Hz. Tests using this advanced frequencies giveadditional information of the individual hearing performance. They areespecially usefull for the early detection of hearing damages of youngerpersons.

- The headphone Sennheiser HDA200 is designed for highfrequency audiometry. The HDA200 works over the fullfrequency range from 125 Hz to16000 Hz.

- It is possible to use the HDA 200as standard AC receivers for allAC tests or to use two AC-receivers with the MA 53. In this case thenormal AC receiver (TDH 39) goes up to 8000 Hz. The HDA 200 is selectedwith the receiver selector key $ or % as �insert phone�.

- The high frequency bone conduction receiver KLH 96 is optionally availablefor BC measurements from 125 Hz to 16000 Hz.

- The tests with high frequencies are done as described before in chapter 4.- The minimum hearing level starts for frequencies from 9000 Hz to

16000 Hz at -20 dBHL.

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TB MIC

BC MASKLR FF

LRSIGNAL

R LBC INSERT

MONITORTAPE / CDLR

R LAC

2RTAPE / CD

L MICSPEECHR L

L MPicture 46 MA 53 rear panel

with TAPE/CD input

Picture 47 MA 53 in operational with portable CD-player

TB MIC

BC MASKLR FF

LRSIGNAL

R LBC INSERT

MONITORTAPE / CDLR

R LAC

2RTAPE / CD

L MICSPEECHR L

S UPicture 48 MA 53 rear panel

with SPEECH MIC input

6 Speech Audiometry

6.1 Connecting the speech source6.1.1 Connecting a CD or tape-playerTo conduct speech tests using speech testmaterial you can connect a CD- or tape-player to the MA 53. Use a standardphono plug cable to connect the right andleft outputs of the device with thecorresponding inputs < and = on the rearpanel of the MA 53 (see picture 46). Toavoid pinching the cables when closingthe cover, lay the cables in the slotsprovided.If you are using a small portable CD-player or tape you can place it on top ofthe cover of the MA 53 as shown inpicture 47. This saves space and makesthe usage of the CD-player or tape veryconvenient.Caution: If you are using a CD- or tape-player powered by electric current, theplayer must meet electric safetyrequirements, such as IEC 601-1 or UL.This is to avoid electric shock of either thepatient or you. If you are not sure if yourplayer meets these requirements it issafer to use battery power. 5.1.2 Connection of MicrophoneConnect the right microphone to the RSPEECH MIC connector > and the leftmicrophone to the L SPEECH MICconnector ? on the rear panel of theMA 53 (see picture 48). To avoidpinching the cables when closing thecover, lay the cables in the slotsprovided. Place the microphones on topof the cover of the MA 53 (as shown inpicture 47). The microphones can beused for live speech audiometry andcommunication with the patient. If your

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NOISE

TAPETONE

MIC

Talk Over

FFBCAC

INSERT

STIM

+

Hz

L

NOISE

TAPETONEMODE

STIMMIC

MAICO

INSERTFFBCAC

MA 53

TRACKFM PULSE SWAP

PAT

+

Hz

R

STIM

Talk Over

23 7

10 1819

2423

Picture 49 MA 53 controls and displays for speech calibration

SRT

95% 95%

30 dB L 0% R 30 dB Air Correct: 0 Air Tape/CD Wrong: 0 Tape/CD

Calibration

Picture 50 MA 53 display with speech calibration of CD-player or tape

SRT 30 dB L 0% R 30 dB Air Correct:

0 Air Microphone Wrong: 0 Microphone

Picture 51 MA 53 display with speech calibration of the microphone

instrument is supplied with a monitor/mic headset, connect the phone pluglabeled M with the SPEECH MIC connector ?. 6.2 Speech Calibration6.2.1 Calibration of the CD or tape with speech test materialThe MA 53 must be calibrated to the particular speech test material in use toensure valid test levels. That means every time you change the CD or tape youmust recalibrate the instrument. - To calibrate the Tape/CD speech

input select TAPE/CD with the leftSIGNAL selector key &.

- Press the left SIGNAL key &longer than 2 seconds.

- In the lower area of the display #the text Calibration appears.You also see the actual settings in% of the maximum calibrationfor both channels ( seepicture 50).

- On every CD or tape with speechtest material you have a referencesignal, such as a reference toneor speech simulating noise.

- Perform the reference signal with Tape or CD. - Use the left knob ( for the left

channel and the right knob ) forthe right channel and adjust thelevels until both VU-meters @and # show all yellow and onegreen light.

- If one or more red lights are on,reduce the level using the corresponding knobs ( or ).

- Store the calibration by pressingthe STIM bar * or +.

5.2.1 Calibration of the microphone

for live speech test

- To calibrate the SPEECH MICinput select MIC with the leftSIGNAL selector key &.

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Picture 52 MA 53 rear panel with MONITOR phone output

TB MIC

BC MASKLR FF

LRSIGNAL

R LBC INSERT

MONITORTAPE / CDLR

R LAC

2RTAPE / CD

L MICSPEECHR L

O

SRT

95%

30 dB L 0% R 30 dB Air Correct: 0 Air Tape/CD Wrong: 0 Tape/CD Talk Back Level Monitor

0%

Picture 53 MA 53 display withadjustment of the monitor phone

- Press the left SIGNAL key & longer than 2 seconds. - In the lower area of the display # the text Calibration appears. You also

see the actual settings in % of the maximum calibration for both channels.- Position yourself the customary distance from the microphone and speak

test words.- 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 +.

6.3 Connection and adjustment of the monitor phone

6.3.1 Connection of the monitor phone

Connect the monitor phone plug E to theMONITOR connector A at the rear panelof the MA 53 (see picture 52). To avoidpinching the cables when closing thecover, lay the cables in the slots provided.The monitor phone allows you and thepatient to hear the speech test materialsimultaneously. This helps to determine ifthe test word was understood by thepatient. If the talk back option of theMA 53 is installed, the communicationfrom the patient to the operator will beheard with the monitor phone.

6.3.2 Adjustment of the monitor phone

- To adjust the output level of the monitor phone press the right SIGNAL key' longer than 2 seconds.

- In the lower right area of thedisplay # the text Monitorappears. Below that you see theactual settings in % of themaximum output level (seepicture 53).

- Perform a test signal with Tape,CD or the talk back microphone (if installed).

- Use the right knob ) and adjust the output level that is comfortable foryou.

- Store the adjustment by pressing the STIM bar * or +.6.4 Speech Audiometry

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SRT 30 dB L 0% R 30 dB Air Correct: 0 Air Tape/CD Wrong: 0 Tape/CD

Picture 55 MA 53 display withinitial settings for 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 stimuli50% of the time. Usually, recognition is indicated by repetition of thespeech-stimulus item. The speech test can be done with recorded speechtest material from CD or tape or with the microphone and live voice usingstandardized word lists. Different methods for speech tests are standardizedworldwide such as the ASHA guidelines for determining the threshold levelfor 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 from the 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 sideon the right, blue side on the left. Adjust theheadband of the headphones so that the receivers areat the correct height (the sound output grid 8 exactlyfacing the ear canal).

- Set the receiver selectors $ and% to AC and the signal selectors& and ' both to TAPE/CD (ifyou are using recorded speechtest material) or to MIC (if youwish to perform a speech testwith live speech).

- On the LCD-display # the initialsetting for speech audiometry (see picture 55) appears. The percentage ofthe speech discrimination score is displayed in the middle. Below this, thenumber of correct and incorrect words is shown.

- If you are using CD or tape, put the monitor phone on to hear the testwords.

- Depending on your test method, use the level control knob ( or ) to setthe start level.

- Perform the test words.- Tally the correct words by pressing the frequency up key / or 0.- Tally the incorrect words by pressing the frequency down key ! or 1.- When you finish a word list, note the percentage of the speech

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SRT 40 dB L 50% R -10 dB Air Correct: 5 Air Tape/CD Wrong: 5 Tape/CD

Picture 56 MA 53 display withtypical result for speech audiometry

discrimination score. In theexample shown in picture 56,one half of the words were heardcorrectly.

- If you are working online with aPC press the STIM bar * or + totransfer the test result to the PC(see also chapter 10).

- To clear the score for the next test, press the FM key 3.It is also possible to perform the speech test with loudspeakers (e.g. for theverification of hearing aid fitting) or bone conduction.

- Select the required transducer with the RECEIVER selection button $ or %and proceed as described before.

6.5 MaskingSpeech audiometry has similar masking rules to those desribed in chapter4.4 for pure tone audiometry.When TAPE/CD or MIC is selected on one channel, and NOISE masking onthe opposite channel, the MA 53 automatically performs speech maskingnoise.

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HL 30 dB L 1000 Hz R 30 dB Air Air Tone NB-Noise

Mixing L=L+R off R=R+L off

Picture 57 MA 53 display withmixing selection screen

HL 30 dB L 1000 Hz R 30 dB Air Air Tone NB-Noise

Mixing L=L+R on R=R+L off

Picture 58 MA 53 display withmixing selection for the left ear

HL 30 dB LR 1000 Hz 30 dB Air Tone NB-Noise

Picture 59 MA 53 display withselected mixing for the left ear

7 Advanced features

7.1 Complex mixingThe complex mixing feature of the MA 53 allows the operator to route twodifferent test signals to the same ear. The test signals and the test levels areindependently adjustable but will be presented to one ear (ipsilateral). Thisfeature could be used to test with speech in noise, competing messagetests, tone on noise or several other combinations.

- To enter the complex mixingpress the swap key 5 longerthan 2 seconds.

- The LCD-display # shows them i x i n g s e l e c t i o n s ( s e epicture 57).

- Use the left frequency up key /to switch on the mixing for theleft ear and the right frequencyup key 0 for the right ear.

- Picture 58 shows i.e. the LCD-display for enabled mixing on theleft ear.

- Store the selection by pressingthe STIM bar * or +.

- The LCD-display # now showsthe actual setting for mixing. Inthe example picture 59 is a puretone with a level of 30 dBHL and anarrow band noise with a level of30 dBHL, both with a frequency of1000 Hz, presented to the leftear.

- Adjust hearing level and the test signal independently for both channels.Both signals will be mixed and presented to the left ear.

- You can also select other receivers like BC, FF or insert phone for the leftear with the left receiver selector key $.

- Other possible selections are mixing with presentation to the right ear or toboth ears.

- To exit the complex mixing press the swap key 5 longer than 2 secondsand switch the mixing for the left and the right ear to the off position.

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TB MIC

BC MASKLR FF

LRSIGNAL

R LBC INSERT

MONITORTAPE / CDLR

R LAC

2RTAPE / CD

L MICSPEECHR L

QPicture 60 MA 53 rear panelwith TALK-BACK MICROPHONE and

ASSISTANT-PHONE connector

SRT

95%

30 dB L 0% R 30 dB Air Correct: 0 Air Tape/CD Wrong: 0 Tape/CD Talk Back Level Monitor

0%

Picture 61 MA 53 display withadjustment of the talk-back microphone

7.2 Advanced Noise SelectionThe MA 53 offers for advanced masking or testing the selection of narrowband noise, speech masking noise and white noise as test signal.

- Enable this feature from the user setup menu (see chapter 8.17)- The additional signals are now available as test signals. Select the required

signal by pressing the signal selector key & for the left channel and key 'for the right channel.

- When the noise-LED lights you can choose between NB-Noise, Speech-Noise and White Noise by pressing the signal selector key.

7.3 Talk-back microphoneThe optional talk-back microphone allows the patient to speak to theoperator. This feature is used if thepatient sits in a sound excludingbooth. The communication from thepatient to the operator will be heardwith the monitor phone.

7.3.1 Connection of the talk-backmicrophoneConnect the talk-back microphoneplug to the TB MIC connector B atthe rear panel of the MA 53 (seepicture 60).To avoid pinching thecables when closing the cover, laythe cables in the slots provided.

7.3.2 Adjustment of the talk-back microphone- To adjust the level of the talk-

back microphone press the rightSIGNAL key ' longer than 2seconds.

- In the lower left area of thedisplay # the text Talk Back Levelappears. Below that you see theactual settings in % of themaximum output level (see picture 61).

- Let the patient say some test words with the talk-back microphone.- Use the right knob ) and adjust the output level that is comfortable for

you.- Store the adjustment by pressing the STIM bar * or +.7.4 Assistant phone

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TB MIC

BC MASKLR FF

LRSIGNAL

R LBC INSERT

MONITORTAPE / CDLR

R LAC

2RTAPE / CD

L MICSPEECHR L

Q

Picture 62 MA 53 rear panelwith TALK-BACK

MICROPHONE and ASSISTANT-PHONEconnector

SRT

95%

30 dB L 0% R 30 dB Air Correct: 0 Air Tape/CD Wrong: 0 Tape/CD Assistant

Picture 63 MA 53 display with

adjustment of the assistant phone

The optional assistant phone allows the operator to speak directly to anassistant person in the sound excluding booth. This could be a parent whenmeasuring a children. The operator speaks to the assistant person via thetalk forward microphone and the assistant phone. This communicationcannot be heard by the patient.

- To talk to the patient press the left TALK OVER button 2.- To talk to the assistant person press the right TALK OVER button 7.7.4.1 Connection of the assistant phone

Connect the assistant phone with the attached connecting cable togetherwith the talk-back microphone tothe TB MIC connector B at the rearpanel of the MA 53 (see picture62).To avoid pinching the cableswhen closing the cover, lay thecables in the slots provided.

7.4.2 Adjustment of the assistantphone

- Press the right TALK OVER key 7. Inthe lower area of the display # thevolume level of the assistant phoneis shown (see picture 63).

- Adjust the assistant volume withthe left ( or right ) knob.

- Release the TALK OVER key 7 ifyou have finished talking to thepatient.

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8 Quick reference guide

8.1 Startup settingsAir conduction on both channelsPure tone on both channels 30 dBHL on both channelsPresenter mode

8.2 Receiver selectionPress 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 onboth channels simultaneously.After a new selection the level will be reset to 30 dBHL.

8.3 Signal selectionPress either the right ' or left & SIGNAL key to select the signal. The kindof NOISE signal depends on the signal of the opposite channel. Speechmasking noise is used if on the opposite channel the speech signal isselected (see 8.4 below). The display # shows the selected signal below thereceiver text.The 5. Position is signal off. The light at the signal key & or ' and theSTIM LED , or - is off and the level in the display # is erased.

8.4 How to select tone or speech audiometry modeThere 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 displayThis table shows how to select one of these modes:

Signal left Signal right Mode

Tone Tone Tone

Tone Noise (NBN) Tone

Tone Tape/CD or LV Tone

Noise (NBN) Tone Tone

Tape/CD or LV Tone Tone

Tape/CD or LV Tape/CD or LV Speech

Tape/CD or LV Noise (Speech) Speech

Noise (Speech) Tape/CD or LV Speech

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8.5 Frequency selectionUse one of the two sets of frequency keys //! or 1/0 to select thefrequency. The maximum and minimum frequency depends on the receiveryou have selected.

8.6 Warble tone (FM)Press the FM key 3 to activate the warble tone. Warble is shown in thedisplay #.Press the FM key 3 again to switch back to pure tone.

8.7 Pulse tone Press the PULSE key 4 to activate the pulse tone. Pulse is shown in thedisplay # and the light above the PULSE key 4 is on.Press the PULSE key # again to deactivate pulsing.

8.8 Suprathreshold testsPress the PULSE key # longer than 2 seconds. In the lower area of thedisplay # the parameters of the ABLB, DLI and SISI test are shown.Using the PULSE key 4, select the test and parameter. Press one of the STIM bars * or + to select your choice. The lower area ofthe display # is cleared and the selected test is shown on the display #.The light above the PULSE key 4 is on.To change to another parameter press the PULSE key 4 again and holdlonger than 2 seconds.To end the selected test, press the PULSE key 4 briefly.8.8.1 SISI Test

Once SISI is selected, the test begins immediately by conditioning in5 dB increments. Press the PULSE key again to enter the next levelsof SISI conditioning (3 dB, then 2 dB) and to start the SISI test (1dB).During the test the display # shows the increment level, the numberof presented increments and the number of correct answers given bythe patient. In addition, �Tone Now� is displayed when anincrement is presented and �Answer Now� is displayed during theanswer acceptance time.During SISI-conditioning it is possible to clear the counters bypressing the FM key 3.To cancel the conditioning and the SISI test and to return to standardoperation press the SWAP key 5.After 20 increments the SISI test is finished. The text SISI Result withthe result in percentage is shown.You can stop the SISI test with the PULSE key 4. The text SISIaborted and the actual result in percentage is shown.

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Press the PULSE key 4 to quit the SISI test.8.8.2 Decay test (Carhart)

If the patient presses the patient response switch longer than 3 seconds, inthe lower area of the display # a decay bar appears and shows the countedtime until the patient releases the patient response switch.To clear the display # and reset the decay function press one of the STIMbars * or +.

8.9 Swap functionPress the SWAP key 5 to exchange the left and right channel. The bigletters R and L will be swapped in the display # and the light above theSWAP key 5 is on.Press the SWAP key 5 again to deactivate swapping.

8.10 Tracking functionPress the TRACK key 6 to activate tracking. Both the left and right sides ofthe display # will say TRACKED, meaning that both channels are trackingeach other. If NOISE is selected on one channel, the text TRACKED iserased, because a noise channel is not allowed to track a signal channel.Press the TRACK key 6 again to deactivate tracking.

8.11 STIM Mode selectionPress STIM MODE . key to switch between continuous presentation andpresentation by pressing the STIM bar * or +. When in continuouspresentation mode the STIM bars * and + function as interrupters. Thelight above the STIM MODE key . is on if continuous presentation isselected.Speech and noise are always in continuous presentation, except when bothchannels are selected as noise.Press the STIM MODE key . again to deactivate continuous presentation.

8.12 Interlock functionPress the STIM MODE key . longer than 2 seconds to activate the interlockfunction. 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 # showsNo Interlock.Press the STIM MODE key . longer than 2 seconds to deactivate theinterlock function.

8.13 Talk-over microphonePress one of the TALK OVER keys 2 and 7. In the lower area of thedisplay # 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 2 or 7 if you have finished talking to thepatient.

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8.14 Talk-back microphone and Monitor volume controlPress the right SIGNAL key ' longer than 2 seconds and the volume controlbars for TB and monitor are shown.Adjust the monitor volume with the right knob ). Adjust the talk-back microphone volume with the left knob (.To store the actual settings press one of the STIM bars * or +.

8.15 Speech audiometryTo select speech audiometry switch both channels to TAPE/CD or MIC byusing the SIGNAL selector keys $ and '. In speech mode the display #shows the percentage of correct repeated words. Below this percentage thenumber of correct and wrong repeated words is shown.To count the correct words press one of the frequency up keys / or 0.To count the wrong words press one of the frequency down keys ! or 1.To clear the counter press the FM key 3.

8.16 Speech calibrationTo calibrate the speech inputs TAPE/CD or MIC select the signal you'd liketo calibrate with the left SIGNAL selector key &.Press the left SIGNAL key & longer than 2 seconds. In the lower area ofthe display # the text Calibration appears. Perform the reference signalwith Tape, CD or microphone. Use the left knob ( for the left channel andthe right knob ) for the right channel and adjust the levels until both VU-meters @ and # show all yellow and one green light. If one or more redlights are on, reduce the level using the corresponding knobs ( or ).Store the calibration by pressing the STIM bar * or +.

8.17 User menuTo enter the User Menu you have to press the FM key &.To choose an item from the menu use the FREQUENCY keys //! or 1/0.To select the chosen item press one of the STIM bars * or +.Change the actual setting with the FREQUENCY keys //! or 1/0.To confirm the changed setting press one of the STIM bars * or +.To return without change press the FM key &.To return to the standard operation press the FM key & at the user menu.

MAICO


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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 Setup of special functionsUser Preference Customization of the instrument* = only accessable if option is purchased

The User Setup Menu has the following selections:Frequence Roll Setting of frequency control function (stop at highest and lowest

frequency or continuous change) Default Levelset Initial level (signal or receiver change) is 30 dBHL or not alteredMonitor with STIM Monitor phone active only with speech or presentation of actual

test signalSRT Test Enable/disable Speech Reception Threshhold test Adv. Noise Select. Enable/disable additional masking / test signals ( NB-noise, speech-

noise, white noise)el. Output FF Electric output off or active when FF selected

The User Preference Menu has the following selections:Off Signal Enable/disable switch off position of signal selector key & and 'Start with IP* Default setting of INSERT instead of ACStart Tone / NBN Initial masking setting of right channel on/offLanguage Select Submenu to select language Presenter 1.5s The signal will only 1.5 s presented when the STIM bar is pressedInvers Dials Changes direction of level control dials ( and )Interru./Present Default setting of STIM MODE (Presenter or Interrupter)Bone-Mask-System* Activates the special MAICO Bone Masking headset

(not available in the USA)* = only accessable if option is purchased

MAICO


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9 Recommended literature

Audiometric Interpretation: A Manual of Basic AudiometryLloyd, Lyle L., and Harriet KaplanBaltimore: University Park Press, 1980

Auditory Disorders: A Manual for Clinical EvaluationJerger, Susan, and James JergerBoston: College Hill Press, 1981

Handbook of Clinical AudiologyKatz, JackBaltimore: William & Wilkins, 1994

Roeser�s Audiology Desk ReferenceRoeser, Ross J.New York / Stuttgart: Thieme, 1996

Auditory DiagnosisSilam, Shlomo and Carol A. SilvermannSan Diego / London: Singular Publishing Group, 1997

MAICO


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HL 30 dB L 1000 Hz L 30 dB Air Air Tone Tone

Picture 64 MA 53 display withpure tone threshold setting

SRT 30 dB L 0% R 30 dB Air Correct: 0 Air Tape/CD Wrong: 0 Tape/CD

Picture 65 MA 53 display withspeech setting

10 Computer interfaceThe MA 53 has a built-in serial RS 232 PC-interface for data transfer to aconnected PC. The serial cable to connect the MA 53 with the PC should be anormal, non twisted 9-pin extension cable. It has a male and a female connectorwith all wires directly connected 1:1. It is also sold as monitor extension cable. Caution: The computer you are using must meet electric safetyrequirements, such as IEC 601-1 or UL. This is to avoid electric shock ofeither the patient or you.

All test results are transferred online to the PC and stored in the database.- In pure tone audiometry initially

all measured data is transferredas hearing threshold data. Youcan see the letters HL meaningthreshold measurement in theupper middle of the LCD-display # (see picture 64).

- To test the uncomfortable level (UCL) press the receiver selector button $or % longer than 2 seconds and the LCD-display # in the upper rowchanges from HL to UL. All measured data is now transferred as UCL data.

- To test the most comfortable level (MCL) press the receiver selectorbutton $ or % longer than 2 seconds and the LCD-display # in the upperrow changes from UL to ML. All measured data is now transferred as MCLdata.

- In speech audiometry initially allmeasured data is transferred asSpeech Reception Threshholdtest data. You can see theindication SRT in the uppermiddle of the LCD-display # (seepicture 65).

- To test with single syllables press the receiver selector button $ or % longerthan 2 seconds and the LCD-display # in the upper row changes from MSto SS. All measured data is now transferred as single syllable test data.

- To test the uncomfortable level (UCL) for speech press the receiver selectorbutton $ or % longer than 2 seconds and the LCD-display # in the upperrow changes from SS to UL. All measured data is now transferred as UCLspeech data.

MAICO


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Picture 66 Changing of theear cushions

11 Care and maintenance of the instrument

Disconnect the power plug before cleaning!

- To clean the instrument, headphones,bone conduction receiver, loud-speaker and other accessories use asoft cloth dampened with a littlewarm soapy water or washing-upliquid; no alcohol or spirits shouldbe used.

- The ear cushions Z of the headphonecan be detached for cleaning. Toremove the ear cushion Z pull itgently from the earphone. Toassemble the cleaned or changed earcushion press it on the earphone andmake sure that it sits properly. Thesound outlet hole must be exactly inthe middle of the earphone.

- During cleaning, please ensure that no liquid runs into the switches, levelcontrol, headphone capsules or loudspeaker openings.

MAICO


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/ 50 - 60 Hz96 - 240 V

RS 2321 AT

A BPicture 67 Power socket and fuses

12 Trouble shooting

If you should find that your instrument is no longer working properly during atest run, please check the following points:

Diodes in the buttons do not light up and theLCD-Display is blank #:

- Is the power cord plugged in correctly?

- Check the power fuses C.

Disconnect the power plug, unscrew the fusesC alongside the power cord socket and checkthe fuses. If the wire in the glass vial is broken,please 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 - 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 loudspeakerloose or defective?

If your instrument still does not work properly after this short check, pleaseconsult your dealer or service center.

MAICO


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0124

13 Technical Data

The MA 53 audiometer is an active, diagnostic medicalproduct according to the class IIa of the EU medical directive93/42/EEC.

Standards: IEC 645-1/ EN 60 645-1: Type 2IEC 645-2 : Type AANSI S3.6-1996 : Type 1 HF A

Test-Frequencies: 125 Hz, 250 Hz, 500 Hz, 750 Hz, 1 kHz, 1.5 kHz, 2 kHz,(individual selectable 3 kHz, 4 kHz, 6 kHz, 8 kHz, 12 kHz, 9 kHz*, 10 kHz*,for each channel) 11.2 kHz*, 12.5 kHz*, 14 kHz*, 16 kHz*

* = with optional HDA 200

Level step: 5 dB, 2 dB or 1 dB level steps (user selectable) Sound Pressure Level: AC with earphone Telephonics TDH 39:

- 10 dBHL ... 120 dBHL ( 125 Hz -10 dBHL .. . 80 dBHL)( 250 Hz -10 dBHL ... 100 dBHL)

( 500 Hz, 4 kHz, 6 kHz -10 dBHL ... 115 dBHL)( 8 kHz -10 dBHL ... 105 dBHL)

( 12 kHz -10 dBHL ... 90 dBHL)

BC with bone conduction receiver Radio Ear B 71: - 10 dBHL ... 80 dBHL ( 250 Hz, 6 kHz -10 dBHL ... 50 dBHL)

( 500 Hz, 750 Hz, -10 dBHL ... 60 dBHL)( 1 kHz -10 dBHL ... 75 dBHL)

( speech -10 dBHL ... 75 dBHL)( 125 Hz, 8 kHz no output )

AC with optional earphone Sennheiser HDA 200:- 10 dBHL ... 120 dBHL

( 125 Hz, 8 kHz, 9 kHz -10 dBHL ... 100 dBHL)( 250 Hz, 4 kHz, 6 kHZ, 9 kHz -10 dBHL ... 110 dBHL)

( 2 kHz, 3 kHz -10 dBHL ... 115 dBHL)( 10 kHz, 11.2 kHz, 12,5 kHz -10 dBHL ... 90 dBHL)

( 14 kHz -10 dBHL ... 80 dBHL)( 16 kHz -10 dBHL ... 60 dBHL)

Insert earphone with optional EAR 3A:- 10 dBHL ... 110 dBHL ( 125 Hz -10 dBHL ... 75 dBHL)

( 250 Hz, 6 kHz -10 dBHL ... 90 dBHL)( 750 Hz, 1 kHz -10 dBHL ...115 dBHL)

( 8 kHz -10 dBHL .. . 85 dBHL)

FF with optional loudspeaker Canton Plus XS: (not available in USA)

- 10 dBHL... 90 dBHL (measurement in 1m distance)

( 125 Hz -10 dBHL ... 65 dBHL)( 250 Hz, 8 kHz -10 dBHL ... 75 dBHL)

( 500 Hz, 1 kHz, 1.5 kHz, speech -10 dBHL ... 85 dBHL)

MAICO


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FF with optional portable loudspeaker MAICO SBC:- 10 dBHL... 90 dBHL (measurement in 1m distance)

( 125 Hz, 250 Hz no output )( 750 Hz, 8 kHz -10 dBHL ... 80 dBHL)

( 500 Hz, 1 kHz, 1.5 kHz, speech -10 dBHL ... 85 dBHL)( 3 kHz, 4 kHz -10 dBHL ... 100 dBHL)

Test Signal: Pure tone, pulse tone, warble tone, narrowband noise,broadband noise (speech masking noise)

Modulation: Pulse tone: 0.5 s on/offWarble tone: triangular, freq. deviation 5%,

repetition rate 5 HzTests: ABLB (Fowler): 0.5 s and 1 s

DLI (Lüscher): 4; 3; 2; 1.5; 1 and 0.5 dBSISI test: 5 dB, 3 dB, 2 dB conditioning;

1 dB test; Modulation time 4.8/0.2 sCarhart decay test (built-in stop watch)Stenger test

Functions: Tone presenter / interrupterInterlock (tone presentation of both channels

simultaneously)Channel swap Tracking (fixed level difference between both channels)Mixing (ipsilateral presentation of both channels)Talk forward, Talk back, Monitor phone, Assistant phone

Warm-up time: less than 10 min after power onEnvironment + 15 ... + 35 /C / + 59 ... + 95 /F (operation)conditions: + 5 ... + 50 /C / + 41 ... + 122 /F (storage)

Maximum humidity 90 % (storage and operation)Dimensions: W x D x H: 36 x 46 x 15 cm / 14.2� x 18.1� x 5.9� Weight: 4.6 kg / 10.1 lbs (with accessories 5.8 kg / 12.8 lbs)Power Supply: 100 - 240 V~ 50/60 Hz ±10 % Power Consumption: approx. 25 VADevice Fuses: 2x 1A slow blow

MAICO


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/ 50 - 60 Hz100 - 240 V

RS 2321 AT RESPONSEPATIENT

INTERFACE TB MIC

BC MASK

SIGNALR L 2R

TAPE / CD

FF

L

LR

R 1 LTAPE / CD MONITOR

BC INSERT LR

MICSPEECHR L

AC LR

AB D

CF

EH

GJ

IL

KN

MP

OR

QT

SV

U

Picture 68 Rear of MA 53 with connection plugs

Connection plugs: Connection SpecificationD power socket left/right=power, (100 ... 240 V~ 50/60 Hz)

middle=prot.GNDC power fuses 1 A slow blow

E serial PC-interface 1=GND, 2=RX, 3=TX, RS 232 C5=GND, 6=DTR

F patient response switch sleeve=GND, tip=in RI= 500 SG signal output right sleeve=GND, tip=out ZA= 47 kS, UA= 8 Veff

H signal output left sleeve=GND, tip=out ZA= 47 kS, UA= 8 Veff

I FF (loudspeaker) right channel sleeve=GND, tip=out ZA= 4 S, UA= 8 Veff

J tape/CD input right channel sleeve=GND, tip=in ZI= 47 kS, UI= 0.04 - 5 Veff

K FF (loudspeaker) left channel sleeve=GND, tip=out ZA= 4 S, UA= 8 Veff

< tape/CD input left channel sleeve=GND, tip=in ZI= 47 kS, UI= 0.04 - 5 Veff

L masking phone for BC (option) sleeve=GND, tip=out ZA=10 S, UA=1 Veff

= tape/CD input right channel sleeve=GND, tip=in ZI= 47 kS, UI= 0.04 - 5 Veff

< tape/CD input left channel sleeve=GND, tip=in ZI= 47 kS, UI= 0.04 - 5 Veff

M BC (bone conduction receiver) sleeve=GND, tip=out ZA= 4 S, UA= 8 Veff

A monitor phone sleeve=GND, tip=out ZA= 250 S, UA= 8 Veff

N insert phone right channel sleeve=GND, tip=out ZA=10 S, UA=1 Veff

B talk-back microphone sleeve=GND, tip=in ZI= 1 kS, UI= 0.38 - 500 mVeff

assistant phone sleeve=GND, ring=out ZA= 250 S, UA= 8 Veff

O insert phone left channel sleeve=GND, tip=out ZA=10 S, UA=1 Veff

> right live voice microphone sleeve=GND, tip=in ZI= 1 kS, UI= 0.38 - 500 mVeff

P AC (headphone) right channel sleeve=GND, tip=out ZA=10 S, UA=1 Veff

? left live voice microphone sleeve=GND, tip=in ZI= 1 kS, UI= 0.38 - 500 mVeff

Q AC (headphone) left channel sleeve=GND, tip=out ZA=10 S, UA=1 Veff

MAICO


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Calibration values: AC-Receiver Telephonics TDH 39 Force: 4 ... 5 N

Frequency [Hz] Reference equivalent threshold sound pressure level

Sound damping

ISO 389 - 1with Coupler IEC 318-2

[dB] (re 20 :Pa)

ANSI S3.6-1 with Coupler NBS 9A

[dB] (re 20 :Pa) [dB]

125 45 45 3250 25.5 25.5 5500 11.5 11.5 7750 7.5 8 -

1000 7 7 151500 6.5 6.5 -2000 9 9 263000 10 10 -4000 9.5 9.5 326000 15.5 15.5 -8000 13 13 24

12000 (15) (15) -

Calibration values: BC-Receiver Radio Ear B 71 Force: 4.9 ... 5.9 N

Frequency [Hz] Reference equivalent threshold force level

Air radiation

ISO 389 - 3

[dB] (re 1:N)ANSI S3.6-1996

[dB] (re 1:N)minimum / maximum

[dB]

250 67 67 -500 58 58 -750 48.5 48.5 -

1000 42.5 42.5 -1500 36.5 36.5 -2000 31 31 -3000 30 30 4 / 184000 35.5 35.5 - 6000 40 - 10.5 / 31

MAICO


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Calibration values: AC-High Frequency Receiver Sennheiser HDA 200 Force: 9 ... 10N


Sound damping

ISO 389 - 5with Coupler IEC 318and Type 1 Adapter

[dB] (re 20 :Pa)

ANSI S3.6-1 with Coupler IEC 318 and Type 1 Adapter

[dB] (re 20 :Pa) [dB]

125 29,5 14.5250 18.0 16.0500 9.5 22.5750 6.5 -

1000 6.5 28.51500 5.5 -2000 3.0 32.03000 3.0 -4000 8.5 45.56000 9.5 -8000 17.0 16.0 44.09000 18.0 17.0 -

10000 22.0 21.5 -11200 22.5 21.0 -12500 27.5 27.5 -14000 36.0 37.5 -16000 58.0 58.0 -

MAICO


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Calibration values: FF : Free sound field (0 degree incidence)


ISO 389 - 7

[dB] (re 20 :Pa)ANSI S3.6-1996

[dB] (re 20 :Pa)

125 22 22250 11 11500 4 4750 2 2

1000 2 21500 0.5 0.52000 -1.5 -1.53000 - 6 - 64000 - 6.5 - 6.56000 2.5 2.58000 11.5 11.5

Calibration values: Insert phone Eartone 3A


Sound damping

ISO 389 - 2with Coupler IEC 126

[dB] (re 20 :Pa)

ANSI S3.6-1 with Coupler HA-2

[dB] (re 20 :Pa) [dB]

125 26 26 32.5250 14 14 36500 5.5 5.5 37.5750 2 2 -

1000 0 0 36.51500 2 2 -2000 3 3 333000 3.5 3.5 -4000 5.5 5.5 39.56000 2 2 -8000 0 0 42.5

MAICO


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Standard accessories: 1 air conduction receiver Telephonics TDH 391 bone conduction receiver Radio Ear B 711 microphone (for live speech)1 patient response switch 1 power cord1 pad of audiogram paper (50 sheets)

Optional accessories: Loudspeaker Canton Plus XS Part. No. 801 106

(not available in the USA)Portable Loudspeaker SBC (pair) Part No. 802092

Insert phone Part No. 4790

Talk-back microphone Part No. 6619

Monitor phone Part No. 8697642565

Audiogram paper (50 sheets) Part No. 861 002

Options: High Frequency Audiometry withHDA 200 Headphone Part No. 801110-1

KLH 96 Bone Conductor Part No. 801108

MAICO


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14 Warranty, Maintenance and After-Sales Service

The MA 53 audiometer is guaranteed for 1 year. This warranty is extended to theoriginal purchaser of the instrument by MAICO through the Distributor fromwhom it was purchased and covers defects in material and workmanship for aperiod of one year from date of delivery of the instrument to the originalpurchaser. The audiometer may be repaired only by your dealer or by a service centerrecommended by your dealer. We urgently advise you against attempting torectify any faults yourself or commissioning non-experts to do so.

In the event of repair during the guarantee period, please enclose evidence ofpurchase with the instrument.

In order to ensure that your instrument works properly the audiometer should bechecked and calibrated at least once a year. This check has to be carried out byyour dealer.

When returning the instrument for repairs it is essential to also send theheadphone, bone conduction receiver and other accessories.

Send the device to your dealer or to a service center authorized by your dealer.

Please also include a detailed description of the faults.

In order to prevent damage in transit, please use the original packing if possiblewhen returning the instrument.

MAICO


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15 Safety Regulations

15.1 Electric Safety: The MA 53 audiometer is constructed to complywith protection class II of the international standardIEC 601-1 (EN 60601-1).Protection from an electric shock is ensured evenwithout the system earth connection.The instruments are not intended for operation inareas with an explosion hazard.

15.2 Measuring security: To guarantee that the audiometer works properly,the instrument has to be checked and calibrated atleast once a year.The service and calibration must be performed by anauthorized service center. In accordance with theregulations of the EU medical directive we will dropour liability if these checks are not done.

The use of non-calibrated audiometers is notallowed.

15.3 Device control: The user of the instrument should perform asubjective instrument check once a week. This checkcan be done following the list for subjectiveinstrument check (see next page). For your ownsecurity, you should copy the enclosed list, fill it inonce a week and store it in your files.

MAICO


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16. List for the subjective instrument checks

- Clean the cushions of the headphones!- If necessary untangle all cords - Are the cushions of the headphones all right? If not replace them!- Are the connectors and cables damage-free?- Can all operator elements be handled smoothly ?- Are the operator elements over-tightened or damaged?- Is the patient response system o.k. ?

Model........................................................................... Manufacturer................................................................

Serial No....................................................................... Test person...................................................................

Purity of test signals Try all test frequencies at the HL settings of the table and if necessary enter : �B� for humming, �G� for noises, �V� for signal distortion , �S� for switching noises

Right Ear Level Left Ear

kHz 0.25 0.5 1 2 3 4 6 8 0.25 0.5 1 2 3 4 6 8 khz

AC

30 dB HL

50 dB HL

70 dB HL

BC 30 dB HL

50 dB HL

* in the event that disturbed noises �B�, �G�, �V� or �S� have been checked then SERVICE!* If conduction test signals are also audible in the non-test ear, then SERVICE!

Air conduction audiogram with test person

Right Ear Level Left Ear

kHz 0.25 0.5 1 2 3 4 6 8 0.25 0.5 1 2 3 4 6 8 khz

TargetdB HL

leftphone

ActualdB HL

leftphone

rightphone

ActualdB HL

rightphone

* desired value is the measured value of the last audiogram of the test person**Repeat the measurement with headphones on the wrong way around If the difference between desired and actual value at a particular frequency or between right and left headphones is more than 10 dB, then SERVICE!

Bone conduction audiogram with test person

Level

kHz 0.25 0.5 1 2 3 4 6 8 0.25 0.5 1 2 3 4 6 8 khz

TargetdBHL

Actual dBHL

If the difference between desired and actual value at a particular frequency or between right and left headphones is more than 10 dB, then SERVICE!

Tested:.............................................................................................Date:...............................................................................................

MAICO


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Certificate of Conformity

We, MAICO Diagnostic GmbH

Salzufer 13/14,D 10587 Berlin

Germany

certify that the

Diagnostic Audiometer MA 53

starting with serial number 085 6353

is produced according to the Medical Directive 93/42/EEC.

Berlin, April 2001

U. Ledworuski Head of quality department

QW-021/2 04/00

MAICO


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MAICO Diagnostic GmbHSalzufer 13/14D 10587 BerlinTel.: ++4930/70 71 46 50Fax: ++4930/70 71 46 99Email: export@maico-diagnostic .comInternet: www.maico-diagnostic.com

MAICO Diagnostics7625 Golden Triangle DriveEden Prairie, MN 55344Toll Free (++1) 888.941.4201Fax (++1) 952.903.4200Internet www.maico-diagnostics.com

MAICO

Specifications are subject to change.

NOISE

TAPETONE

MIC

Talk Over

FFBCAC

INSERT

STIM

+

Hz

L

NOISE

TAPETONEMODE

STIMMIC

MAICO

INSERTFFBCAC

MA 53

TRACKFM PULSE SWAP

PAT

+

Hz

R

STIM

Talk Over

21

43

65

87

109

1211

1413

1615

1817

2019

2221

2423

2625

/ 50 - 60 Hz100 - 240 V

RS 2321 AT RESPONSEPATIENT

INTERFACE TB MIC

BC MASK

SIGNALR L 2R

TAPE / CD

FF

L

LR

R 1 LTAPE / CD MONITOR

BC INSERT LR

MICSPEECHR L

AC LR

AB D

CF

EH

GJ

IL

KN

MP

OR

QT

SV

U

Front panel with controls and displays(second level function - go to second level function by pressing the selected key longer than 2 seconds)

! left (blue) STIM Led Led off = signal off Led on = signal on

" left (blue) channel level control# left (blue) STIM bar$ left (blue) channel frequency up $ + % press simultaniously for dual frequency mode

% left (blue) channel frequency down $ + % press simultaniously for dual frequency mode

& left (blue) channel TALK OVER Microphone' left (blue) channel VU-meter( left (blue) channel receiver selector key ( select testmode HL, UCL, MCL for selected receiver

) FM - modulation (warble tone) ) press key during switch on to enter the user menu

* left (blue) channel signal selector key * calibration of CD/tape or live voice microphone

+ PULSE tone + pulse tone menu: ABLB, DLI and SISI Test

, PATient response display- STIM MODE - interlock function

. SWAP function . mixing function

/ TRACKING function / level step selection

0 right (red) channel signal selector key1 right (red) channel receiver selector key 1 adjustment of talkback microphone and monitor phone

2 LCD-Display3 right (red) channel VU-meter4 right (red) channel TALK OVER Microphone5 right (red) channel frequency down6 right (red) channel frequency up7 right (red) channel STIM bar8 right (red) channel level control9 right (red) STIM Led Led off = signal off Led on = signal on

: power switch

Rear panel with connectors

; power socket (100 ... 240 V~ 50/60 Hz) < power fuses= serial PC-interface > patient response switch? electrical signal output right channel @ electrical signal output left channel A FF (loudspeaker) right channel B secondary tape/CD input right channelC FF (loudspeaker) left channel D secondary tape/CD input left channel E masking phone for BC (option) F tape/CD input right channelG tape/CD input left channel H BC (bone conduction receiver)I monitor phone J insert phone right channelK talkback microphone / assistant phone L insert phone left channelM right live voice microphone N AC (headphone) right channelO left live voice microphone P AC (headphone) left channel

MA 53 Operating Instructions

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Transcript of MA 53 Operating Instructions