Operating Instructions MA 51
Contents
1. Set the lett level control knob to a value just below expected hearing loss Explain to the patient that he should press the button of the patient response switch it he just hears the test tone Press the STIM bar amp for a certain time to present the test VIA L JUL tone The STIM LED amp should picture 11 MA 51 controls and display for light on airconduction threshold test If the patient hears the test tone the patient response display lights red In this case decrease the level with the level control knob Proceed with presenting the test signal as described before If the patient doesnt hear the test tone increase the level with the level a knob Proceed with presenting the test signal as described before When you find a stable threshold value note the level and frequency If the MA 51 is connected to a PC the value was stored with your last STIM presentation Geba MA51 Fe 11a doc 12 851 407 2 10 11 AIC G M Operating Instructions MA 51 E Test through the frequencies Starting at 1 kHz set the higher frequencies first then the lower frequencies Use the frequency up key to select the higher frequencies and use the frequency down key to select the lower frequencies Select the next frequency increase the level again and proceed with presenting the test signal as described before Once all frequencies are tested choose the poorer ear and repeat the hearing threshold2. 6 13 Speech calibration To calibrate the speech inputs Tape CD or MIC select the signal youd like to calibrate with the SIGNAL selector key Press the SIGNAL key longer than 2 seconds In the middle of the display amp the text SCAL appears Perform the reference signal with Tape CD or microphone Use the left knob and adjust the level until the VU meter shows all yellow and one green light If one or more red lights are on reduce the level using the knobs Geba_MA51_Fe_11a doc 23 851 407 2 10 11 Operating Instructions MA 51 Store the calibration by pressing the STIM bar or 6 14 User menu To enter the User Menu you have to press the FM key for more than 2 Sec To choose an item from the menu use the FREQUENCY keys and To select the chosen item press the STIM bar Change the actual setting with the FREQUENCY keys and To confirm the changed setting press the STIM bar To return without change press the FM key To return to the standard operation change press the FM key at the user menu These menu items are available FF bin FrEo dEFA Nonl SIT EL STAr PrES InuE INTE bonE Select the calibration for the first or the second loudspeaker set Select the signal source channel for CD TAPE bln LEtt right Frequency roll on off Default levelset 30 dB on off monitor phone for tone audiometry on off SRT Test on off Electric output for FF FF 2 S
3. 252 INTERFACE NE T TAPE CO MONTOR TE ME BPEBCH MIC g5 200 um I 0 60 HZ 0000 O 161616 olelolol e B D F F N P R F V Picture 32 rear of MA 51 with connection plugs Geba MA51 Fe 11a doc 30 851 407 2 10 11 Operating Instructions MA 51 Calibration values AC Receiver DD 45 Force 4 5 N Reference equivalent threshold Frequency Hz sound pressure level sound damping ISO 389 1 ANSI S3 6 1 with Coupler IEC 318 2 with Coupler NBS 9A dB re 20 uPa dB re 20 uPa dB Calibration values BC Receiver Radioear B 71 Force 4 9 Reference equivalent threshold Frequency Hz force level air radiation ISO 389 3 ANSI S3 6 1996 ey ee ee dB re 1 uN dB re 1uN dB 250 60 10 pp 500 58 158 pp 750 1485 1485 1000 45 185 pp gt 1500 365 1365 pp gt 200 8 188 pp 4000 1355 1355 1 600 40 1 105 31 gt Geba MA51 Fe 11a doc 31 851 407 2 10 11 Operating Instructions MA 51 Calibration values FF Free sound field 0 degree incidence Reference equivalent threshold sound pressure level pega ANSI 3 6 1996 dB re 20 uPa dB re 20 uPa Calibration values Insert phone Eartone 3A Reference equivalent threshold Frequency Hz sound pressure level sound damping ISO 389 2 ANSI S3 6 1 with Coupler IEC 126 with Coupler HA 2 dB re 20 uPa dB re 20 uPa dB Geba MA51 Fe 11a doc 32 851 407 2 10 11 M Operating Instructi
4. MAICO Diagnostic GmbH MAICO Operating Instructions MAICO MA 51 MAICO Diagnostic GmbH Salzufer 13 14 D 10587 BERLIN Tel 49 30 70714650 Fax 49 30 70714699 M Operating Instructions MA 51 MAICO Table of Contents Page NNN 4 2 Description srecctepcatecinceceuedeatentiacceiane eeaciontsnenn ecw aeseineste sen eau peteatasseteinaartaneane 5 3 Getting started 0 cece cece cece cence ee riteni erit rrr errer t rre rr errr rrr errr rreren rnnr enn 7 3 1 Unpacking your INSTTUMENL occ cece cece ecee eee ee eeee ceed estan eeedeeeeneeeaneeans 7 3 2 Preparing the MA 51 for USe rrrrarrrarerrvvrerrvrerrvnrerrversnrvserrrererrrsserrvnsnnn 8 3 3 Getting familiar with the MA 51 r rresrsnrvrerorvrerrrvrernrvrernvvrerrvvrrnrvsernrvnenn 9 3 3 1 Using the keyboard of the MA 51 rrrrnrrrrrnnvrernrvrernrvrerrrerenrvsernrvnnn 10 3 3 2 The display of the MA 51 rrvrerernrvrernvvrerrvnernrvverervsernrvserrrvserrrsrernrsn 11 4 P re tone NNN an en 12 4 1 Air Conduction AC Testing rrrrrrrrrvrvrvrrrvrrrrrrrvrvrrrrrrvrerrverrvrrrrerrvsenn 12 4 2 Uncomfortable Hearing Level UCL Testing 13 4 3 Bone Conduction BC Testing ccccccecccceccsecceeeeeeeeeeeeeeueeeeeestaneenneneens 14 4 4 Masking of the opposite ear rarrrrrrrrnrvrernvvrrrrvvrrrrvnernrvserrrvrerrrererrrsrennn 15 AT Ne 15 4 4 2 MASKING theory rrurnrervrvnrrrvrrrrarrrvrsrvarrrvrrrvarnrvrenvaenrvernrarnnvsnnvsennenn if 4 4 3 NW 15 4 4 4 Automati
5. Geba MA51 Fe 11a doc 9 851 407 2 10 11 Operating Instructions MA 51 3 3 1 Using the keyboard of the MA 51 All main functions of the MA 51 are directly accessable by pressing a single button Not frequently used procedures like the calibration of the speech source are hidden as a second level function To select this function just press the addressed button more than two seconds A user menu for the customization of the MA 51 is available for advanced users see chapter 6 Following is the description of the main and second level functions of each button frequency up change to next higher frequency frequency down change to next lower frequency talk over microphone switches on the talk over microphone as long as the button Is pressed The level can be adjusted with the knobs or The actual value is displayed in dBy at the right I en side of the LED display 8 o receiver selector changes the receiver from AC to BC or FF or INSERT if option assembled The lighted LED above shows the current selection 2nd level Calibration of monitor phone or talk back microphone see chapter 6 11 Waco mast ay pi ve i 8 i T Mee ah de Picture 7 MA 51 keyboard FM modulation warble tone changes test signal trom pure tone to warble tone 2nd Level to enter the user menu press button during power on pulse tone enables pulsing of pure tone or warble tone 2B level step selects 5 d
6. tone tor the right ear and narrow band masking noise for the left ear The corresponding LEDs above the receiver amp the signal and the test channel selector are lighted The frequency is set to 1 kHz and the level to 30 dB for the right test channel and to 10 dB for the left masking channel All these settings are also shown on the display see picture 5 The hearing level can be easily adjusted with the right knob and the masking level with the knob gon the left side of the instrument For optimal convenience these level control knobs are usable from the too or the side of the instrument They are detented in 5 dB steps You can adjust the level step to 2 dB with button The corresponding LED lights when 2 dB level step is selected The STIM bars and 8 are located beside the level control knobs The STIM LED light up when you press the STIM bar to Operating Instructions MA 51 Waro MASI Picture 4 MA 51 power switch display and selection buttons receiver signal and channel 10 1 000 30 Picture 5 MA 51 display with initial settings a w an i ha i Fu Picture 6 MA 51 level and frequency control present the test signal The STIM LED lights continuous because the masking noise is continuous presented The frequency Is changed with up amp and down buttons The design of the MA 51 makes it easy to control level signal presentation and frequency with one hand
7. IEC 601 1 IEC 950 or UL This is to avoid electrical shock of either the patient or you All test results are online transferred to the PC and stored in the database n pure tone audiometry initially all measured data is transferred as hearing threshold data This is bo 10 1 0 0 0 30 indicated by the dot left from the Picture 26 MA 51 display with center of the LED display amp see PUT tone Mreshold setting picture 26 To test the uncomfortable level UCL 10 10 00 80 press the test channel selector button Picture 27 MA 51 display with UCL setting longer than 2 seconds and the dot moves to the center of the LED display All measured data is now 10 1000 80 i deg par EN vel Picture 28 MA 51 display with MCL setting MCL press the test channel selector button longer than 2 seconds and the dot moves to a position right of 10 0 30 the center of the LED display All 540229 mas KR measured data is now transferred aS multisyllable speech test setting MCL data In speech audiometry initially all measured data is transferred as multisyllable test data The dot is left from the center of the LED display see picture 29 To test with single syllables press the test channel selector button longer than 2 seconds and the dot moves to the center of the LED display amp All measured data is now transferred as single syllable test data To test the uncomfortable level UCL for speech press the test channel selector butt
8. app 25 VA 2x 1A slow blow 29 851 407 2 10 11 M Operating Instructions MA 51 MAICO Connection plugs Connection Specification power socket left right power 100 240 V 50 60 Hz middle prot GND power fuses 1 A slow blow serial PC interface 1 GND 2 RX 3 TX RS 232 C 5 GND 6 DTR patient response switch sleeve GND tip in Rl 500 Q signal output right sleeve GND tio out Za 47 KQ Ua 8 Vert signal output lett sleeve GND tip 0ut Za 47 kQ Un 8 Vett FF loudspeaker right channel sleeve GND tip out Za 40 Un 8 Vers FF loudspeaker left channel sleeve GND tip out Za 4 Q Ua 8 Vert masking phone for BC option sleeve GND tip out Za 10 Q Un 1 Vef tape CD input right channel sleeve GND tip in Z 47 kQ U 0 04 5 Vere tape CD input left channel sleeve GND tip in Z 47 kQ U 0 04 5 Veg BC bone conduction receiver sleeve GND tip out Za 4 Q Un 8 Vere monitor phone sleeve GND tip out Za 250 Q Un 8 Vart insert phone right channel sleeve GND tio out Za 10 Q Ua 1 Vers talkback microphone sleeve GND tip inZ 1 kQ U 0 38 500 MVet insert phone lett channel sleeve GND tip out Za 10 Q Un 1 Vers AC headphone right channel sleeve GND tip o0ut Za 10 Q Un 1 Vert O live voice microphone sleeve GND tip in Z 1 kQ U 0 38 500 mVerr W AC headphone left channel sleeve GND tip out Za 10Q Ua 1 Vers F FF L BO MASKE BE R INSERT L R AC L IENT LG F
9. authorized service center In accordance with the regulations of the EU medical directive we will drop our liability if these checks are not done The use of non calibrated audiometers is not allowed 13 3 Device control The user of the instrument should pertorm a subjective instrument check once a week This check can be done following the list for subjective instrument check see next page For your own security you should copy the enclosed list fill it in once a week and store it in your Tiles Geba MA51 Fe 11a doc 35 851 407 2 10 11 Operating Instructions MA 51 Checklist for Subjective Audiometer Testing Clean the ear and head cushion Instrument Untangle all lines when necessary Are the headphone cushion in good condition Ma n ufactu rer If not gt replace Are plugs and leads in good condition undamaged Serial No Are all controls working properly Is the Patient Response Key working properly if available Exa mM ner Check batteries and renew if necessary Test Signal Quality All the test frequencies in the below table indicate typical hearing level and can be changed when necessary Masking B for Buzz tone G for Noise V for signal distortion S for switching masking noise Right Ear Level Left Ear kHz p2505 1 2 B A 6 B 025051 2 B A 6 y BIT Bode PYNT JPP PI ee eee JPP JP 2 ee ee ee JPP JP ee JP JJ JPP JP p oBH JJ Whe
10. control knob adjust for the corresponding masking level Now press the TRACK button The masking level is automatically changed if you adjust the test signal level e g If the test level was 30 dB and the masking level 50 dB and you change the test level to 45 dB the masking level is automatically adjusted to 65 dB Geba MA51 Fe 11a doc 16 851 407 2 10 11 Operating Instructions MA 51 5 Speech audiometry 5 1 Connecting the speech source 5 1 1Connecting of CD Player or Tape To conduct speech tests using speech test JET material you can connect a CD or tape player to the MA 51 Use a standard phono plug cable to connect the right Oo O O O O O O and left outputs of the device with the OO 900 oO G corresponding inputs M and on the rear panel of the MA 51 see picture 17 To avoid pinching the cables when D closing the cover lay the cables in the picture17 MA 51 rear panel slots provided with TAPE CD input If you are using a small portable CD player or tape you can place it on top of the cover of the MA 51 similar as shown in picture 18 for the microphone This saves Space and makes the usage of the CD player or tape very convenient Caution If you are using a CD or tape player powered by electrical current the player must meet the electrical safety requirements such as IEC 601 1 or UL This is to avoid electrical shock of either the patient or you If you are not sure if your player meets these
11. fig Picture ar Me 2 controls and displays I or speecn Calloration reference tone or speech i simulating noise Perform the reference signal 80 SCAL 80 with Tape or CD Use the left knob to adjust NE the level until the VU meter shows 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 5 2 2 Calibration of the microphone for live speech test To calibrate the SPEECH MIC select MIC with the SIGNAL selector key D Press the SIGNAL key longer than 2 seconds In the middle of the display the text SCAL appears You see also the actual settings in of the maximum calibration for both channels see picture 21 Position yourself the customary distance trom the microphone and Speak test words Use the left knob to adjust the level until the VU meter shows 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 Geba MA51 Fe 11a doc 18 851 407 2 10 11 M Operating Instructions MA 51 MAICO 5 3 Connection and calibration of the monitor phone 5 3 1 Connection of the monitor phone Connect the monitor phone to the MONITOR connector at the rear panel of the MA 51 see picture 22 To avoid pinching the cables when closing the cover lay the cables in the slots provided The monitor phone allows you and the patient t
12. hearing threshold for speech It is the lowest level at which the patient correctly recognizes the stimuli 50 of the time Usually recognition is indicated by repetition of the speech stimulus item The speech test can be done with recorded speech test material from CD or tape or with the microphone and live voice using standardized word lists Different methods for speech tests are standardized worldwide such as the ASHA guidlines for determining the threshold level for speech Asha 21 page 353 356 Explain to the patient that he should repeat each word he hears The patient should sit at a distance of at least 1 m from the device Eliminate any obstructions which will interfere with the placement of the earphone cushions YV on the ear i e hair eyeglasses Ensure the headphones are put on correctly Picture 24 Headphone Red side on the right blue side on the lett Adjust the headband of the headphones so that the receivers are at the correct height the sound output grid amp exactly facing the ear canal Set the receiver selectors to AC and the signal selector to 10 Q 30 TAPE CD if you are using recorded Picture 25 MA 51 display with speech test material or to MIC if initial settings for speech audiometry you wish to perform a speech test with live speech On the LED display amp the initial setting for speech audiometry see picture 25 appears The result of speech discrimination in per cent is
13. microphone or a tape or CD player on top of the cover see picture 3 The MA 51 should be operated in a quiet room so that the audiometric examinations are not intluenced by outside noises For use in noisier environments headphones with optional sound insulation muffs are available Electro medical instruments which emit strong electromagnetic fields e g microwaves radiotherapy devices can influence the function of the audiometer Therefore the use M Operating Instructions MA 51 1 mim Picture 3 MA 51 in operation of these instruments is not allowed in 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 first measurement to guarantee precise measuring results If the device has been cooled down e g during transport please wait until it has warmed up to room temperature Geba MA51 Fe 11a doc 8 851 407 2 10 11 m MAICO 3 3 Getting familiar with the MA 51 Turn on the instrument with the power switch amp which is located at the right side of the MA 51 The device performs its initial test and auto calibration If an error is detected the test is stopped and a description of the error code is shown on the LED display In this case please contact your local dealer or Service If the test is passed the instrument is setup to air conduction and pure
14. requirements it is Picture 18 MA 51 in operation with safer to use battery power microphone for live speech audiometry 5 1 2 Connection of Microphone Connect the microphone to the SPEECH MIC connector on the rear panel of the MA 51 see picture 19 To avoid pinching the cables when closing the cover lay the cables in the slots provided Place the O O O O O O O SIGNAL microphone on top of the cover of the MA NA S 51 as shown in picture 18 The OO OOO O microphone can be used for live speech audiometry and communication with the AR patient If your instrument is supplied with a picture 19 MA 51 rear panel combination monitor mic headset connect with SPEECH MIC input the phone plug labeled E with the SPEECH MIC connector O Geba MA51 Fe 11a doc 17 851 407 2 10 11 Operating Instructions MA 51 5 2 Speech calibration 5 2 1 Calibration of the CD or tape with speech test material The MA 51 must be calibrated to the particular soeech test material in use to ensure valid test levels That means every time you change the CD or tape you must recalibrate the instrument To calibrate the Tape CD speech inout select TAPE CD with the SIGNAL selector key Press the SIGNAL key longer than 2 seconds In the middle of the display the text SCAL appears You also see the actual settings in of the maximum calibration for both channels see picture 21 On every CD or tape with 4 ob ib T 7 ig sg ae
15. shown in the middle If you are using CD or tape put the monitor phone on to hear the test words Depending on your test method use the level control knob to set the start level Perform the test words Tally the correct words by pressing the frequency up key Tally the incorrect words by pressing the frequency town key If you are working online with a PC press the STIM bar amp to transfer the test result to the PC see also chapter 8 To clear the counter for the next test press the FM key It Is also possible to perform the speech test with loudspeakers e g for the verification of hearing aid fitting or bone conduction Select the required transducer with the RECEIVER selection button and proceed as described before Geba MA51 Fe 11a doc 20 851 407 2 10 11 M Operating Instructions MA 51 5 5 Masking Speech audiometry has similar masking rules to those desribed in chapter 4 4 for pure tone audiometry When TAPE CD or MIC is selected on one channel and NOISE masking on the opposite channel the MA 51 automatically performs speech masking noise Geba MA51 Fe 11a doc 21 851 407 2 10 11 Operating Instructions MA 51 6 Quick reference guide 6 1 Startup settings Air conduction on both channels Pure tone with a level of 30dB on the right ear Narrow band noise with a level of 10dBHL on the left masking ear Presenter mode 6 2 Receiver selection Press the RECEIVER key t
16. 07 2 10 11 Operating Instructions MA 51 2 Description The MA 51 is an audiometer for pure tone and speech audiometric tests It can be used for ENT diagnostics and hearing aid fittings in the office and for mobile audiometry in clinics homes and abroad Tests can be performed using the DD 45 headphones AC B 71 bone conduction receiver BC or optional insert phones and loudspeakers FF Built in test signals are pure tone pulse tone warble tone narrow band and broadband noise The MA 51 has a microphone for live soeech audiometry and an input for an optional tape CD player with speech test material The MA 51 audiometer delivers 11 air conduction AC test frequencies from 125 Hz to 8 kHz with levels from 10 dBy to 120 dB Bone conduction BC can be tested with 10 test frequencies from 250 Hz to 8 kHz with levels from 10 dBy to 80 dBy with the standard bone conductor B 71 the frequency range Is limited from 250 Hz to 6 kHz The optional insert phones EAR 3A submit levels from 10 dBy to 120 dBu with 11 test frequencies from 125 Hz to 8 kHz Optional loudspeakers are available for free sound field measurements FF The portable loudspeakers MAICO SBC have a dynamic range from 10 dBy to 80 dB at 1m distance for nine test frequencies from 500 Hz to 8 KHz The passive loudspeakers Canton not available in the USA deliver levels up to 80 dB at 1m distance over the entire frequency range from 125 Hz to 8 KHZ
17. 1_Fe_11a doc 22 851 407 2 10 11 M Operating Instructions MA 51 MAICO 6 9 STIM Mode selection Press STIM MODE amp key to switch between continuous presentation and presentation by pressing the STIM bar When in continuous presentation mode the STIM bars and function as interrupters The light above the STIM MODE key is on if continuous presentation is selected Speech and masking noise are always in continuous presentation Press the STIM MODE key again to deactivate continuous presentation 6 10 Talk over microphone Press the TALK OVER key In right area of the display the volume level of the talk over microphone is shown Adjust the talk forward volume with the left or right knob Release the TALK OVER key if you have finished talking to the patient 6 11 Talkback microphone and Monitor volume control Press the RECEIVER key amp longer than 2 seconds Adjust the monitor volume with the right knob Adjust the talkback microphone volume with the left knob To store the actual settings press one of the STIM bars or 6 12 Speech audiometry To select soeech audiometry switch to TAPE CD or MIC by using the SIGNAL selector key In speech mode the display shows in the middle the result of speech discrimination in per cent Tally the correct words press the frequency up key Tally the incorrect words press the frequency down key To clear the counter press the FM key
18. B or 2 GB level step stim mode changes the signal presentation from presenter to interrupter mode tracking function enables the automatic tracking see chapter 4 4 masking channel selector key selects the test ear Right left and binaural are possible settings 2nd Level selects test mode HL UCL MCL for selected receiver see chapter 4 2 signal selector key changes the test signal from pure tone to tape CD or microphone 2nd level Calibration of CD or microphone see chapter 6 13 Geba MA51 Fe 11a doc 10 851 407 2 10 11 M Operating Instructions MA 51 MAICO 3 3 2 The display of the MA 51 The bright LED Display amp of the MA 51 shows levels frequency and test results The display shows the individual settings for the lett 10 1 000 30 channel on the left and the right picture 8 MA 51 display for pure tone HL test channel on the right The frequency or the speech score are displayed in the middle Also the position of the dot in the middle indicates the kind of measurement If the dot position Is left from the center HL test is indicated The dot in the center stands for UCL measurement and a dot right from the middle is MCL measurement The 10 42 90 example picture 8 shows the initial picture 9 MA 51 display for speech UCL test setting for AC threshold test The right test channel is set to 30 dB the left masking channel is set to 10 dBu narrow band noise for masking The test frequency is 1000 Hz and
19. Instructions MA 51 MAICO EE EN 35 13 2 Measuring Security 2 cc cc ccc cece cece a cece een cece cece eeeeeeeseseeeeeeeeeeneeeneeseeens 35 13 3 Device COO EEE 35 Checklist for Subjective Audiometer Testing rrrrrrrrrrrrrvvrrrrvrrrrrvrrrrvnrrnrvnnn 36 Geba MA51 Fe 11a doc 3 851 407 2 10 11 Operating Instructions MA 51 1 Introduction Thank you very much for purchasing a quality product trom the MAICO family This MA 51 audiometer is manufactured to meet all quality and safety requirements and has been certified with the CE symbol according to Medical Directive 93 42 EEC In designing the MA 51 we placed particular importance in making It a user friendly device meaning its operation Is simple and easy to understand And because MA 51 functions are software controlled upgrading later to new extended measurement functions will be simple and inexpensive That means that you have invested in a device that will adjust to your future needs This user manual should make it as easy as possible for you to become familiar with the functions of the MA 51 Please open out the flap of illustrations on the last page The description of the position e g of controls displays and connections found again in the text will make it easier for you to learn how to operate the MA 51 If you have problems or have ideas for further improvements please get in touch with us Simply call Your MAICO team Geba MA51 Fe 11a doc 4 851 4
20. The MA 51 also has separate line level outputs for an external amplifier The hearing level is controlled independently for each channel by two detented dials on the left and right of the instrument which can be operated from the side or the top The level steps are 5 dB and can be changed to 2 dB The signal STIM bar and the frequency up down keys are just beside the level control knobs for easy one handed control of level frequency and signal presentation The bright LED display shows level frequency and other information for each channel As a result of modern microprocessor technology the MA 51 Is easy to use and is extremely reliable The audiometer is designed to be extremely service friendly Automatic test programs make trouble shooting and the yearly calibration as easy as possible Geba MA51 Fe 11a doc 5 851 407 2 10 11 M Operating Instructions MA 51 MAICO PC Interface A serial RS 232C interface for data transfer to a connected computer is built in The optional MAICO audiometry module for NOAH enables the automatic data transfer of all test results of the MA 51 like tone and speech audiogram For more information see chapter 8 Geba MA51 Fe 11a doc 6 851 407 2 10 11 Operating Instructions MA 51 3 Getting started 3 1 Unpacking your instrument Your MA 51 was carefully inspected and packed for shipping However it is a good practice to thoroughly inspect the outside of the shipping box for
21. Warble tone FM ccccccecececcccececececcetecceusesectaeececeeeueacaueetetaveveutereeenas 22 6 6 Pulse TONE cece ccceccceccee cece cece cece eeeeeeeaeeeaeeeaeeeaeeeaeeeaeeeaeeeaeeeaeeteenaeetaeees 22 6 7 Test Channel selection rrrrrrrrrrrvrrrrrrrrvarrrrrrvnrnvnrrrvrrnrarnnvrennarnrvrnnnnnnn 22 6 8 Tracking TUNCTION ccccccccecccceecceeeeceeeeeeeeeeeseeeneseeeneseeaneseeaeseuaeeetaaeeenas 22 6 9 STIM Mode selection rrrrrrrnrnrarnrvnrnrnrrrvarnrarnrvnnnrnenrvsrnrvenrnsnnrarennsnnnnene 23 6 10 Talk over microphone rrrrarnrarrrvnrnrvrrrverrvrrrrarnrersnvrnrvenrvenrarnnvsnnnnnne 23 6 11 Talkback microphone and Monitor volume control 23 6 12 Speech audiometry 0 2 cece cece cece cc cece eeeeeeeeeeeeeeeeeeeeeeeeeeeaeesneeeeeeeen eee 23 6 13 Speech calibration 00 cece cece eee ece eee ee eeeeeeeeeeeeeeeeeeeeeeeeeeneeeneeeaeees 23 60 14 User EN 24 7 Recommended literature rrrurnrvrrrvrrnrarrrvnrrvarrrvrrnrarnrnrnnvrnrverrrnenrvnnnnenn 25 8 Computer interface oo c cece cece a stiren riterite rre rrt E rE EEEE EEEEEEEEEEEE PEE Errn 26 9 Care and maintenance of the instrument rererrrvrerrrrrerrrrrrrrrnrrnrvrrrervnenn 27 10 Trouble shooting rrirrrarrrvrvrvnrrrvrrrvarnrnerrrrrnrarnrvnrnnaenrvrrrrarnrernnvaennnennnsenn 28 11 Technical Data ee ee 29 12 Warranty Maintenance and After Sales Service rrrrrrrrrrrrvrrrrrvrrrnrrsnnn 34 Geba MA51 Fe 11a doc 2 851 407 2 10 11 M Operating
22. c MASKING rrrrvarnrerrrvnrnrvrrrvrrrrarerrarnrvrervaenrvrrrrarnrvrsnvsennenn 16 NNN 17 5 1 Connecting the speech SOUICE 2 0 cece cecc ce ccececceeece ee eeceeeeeeeeen seta eeeneeeaees 17 5 1 1Connecting of CD Player or Tape arrrrvurrnrvnernrvrerrrvrernrvrerrrererrrerennn 17 5 1 2 Connection of Microphone rrunnrvnnnnrvnernrvnernrvrernrvrernvvrerrvvrrnrvserene 17 5 2 Speech calibration ssnesnesissnnssiesrusrresrrrrrerrerrrnrrerrerrusrrerrrrrrnrrerrrerrerre 18 5 2 1 Calibration of the CD or tape with speech test material 18 5 2 2 Calibration of the microphone for live speech test 18 5 3 Connection and calibration of the monitor Phone rrrvrerrrvrerrrvrerrverr 19 5 3 1 Connection of the monitor Phone rrrvrrvrrrrvrerrvrevrvrrrrvrerrrrrrvsernn 19 5 3 2 Adjustment of the monitor phone and talk back microphone 19 Geba MA51 Fe 11a doc 1 851 407 2 10 11 M Operating Instructions MA 51 MAICO 5 4 Speech Audiometry cece cece ccc ce cce cece ee eeeeeeee ceed esse eeeeeeeeaeeeaneeeeeseaneeenees 20 TESE 21 6 Quick reference QUIDE 0 cccecccccccceeccceecceeeeeeeeeeeuneeeueeetuueetunestunestuaeseuesens 22 6 1 Startup Settings JE 22 6 2 Receiver selection 20 ccc eccc cece cece eeeee eect ee eeen cess eeeeeeeeeeeeen seen eeeaeeeeneeeaeees 22 6 3 Signal selection 6 cece cece c cece cece ceeeeeeeeeee ee eeeeeeeeeeeeeeeeneeeeneeeaeeeaeeeneeeaneees 22 TN ee ee 22 6 5
23. d sound This is called crossover Crossover can also occur when measuring air conduction because a small amount of air conducted sound Is received by the skull and transmitted by bone Whether the crossover signal can heard by the opposite ear depends on its inner ear function Relevant to crossover is the sound level which Is received by the opposite ear The difference between the original test signal at the test ear and the received signal at the opposite ear Is called interaural attenuation For bone conduction measurement the interaural attenuation is O to 15 GB Bone conduction crossover is therefore possible even with a slight difference in hearing loss between ears Important Please advise the patient to tell you in which ear he hears the test Signal It is thereby easier to detect crossover 4 4 2 Masking theory To ensure that the patient will not experience crossover you must mask the opposite ear Masking increases the hearing threshold of the opposite ear The masking is done with a noise signal which is transmitted by the headphone For pure tone audiometry a narrowband noise is used This noise changes its center frequency according to the frequency of the test signal 4 4 3 Manual masking If you have to mask use the common masking rules See chapter 7 for recommend literature Masking Is an important part of practical audiometry It is necessary to be familiar with this topic to avoid errors which would lea
24. d to a wrong diagnosis Select the ear you like to test with the channel selector key For the opposite ear narrow band masking noise is automatically set Adjust the required masking level with the level control knob Notice that the masking sound is continuously presented for effective masking You can interrupt the masking signal by pressing the corresponding interrupter key Geba_MA51_Fe_11a doc 15 851 407 2 10 11 M Operating Instructions MA 51 MAICO To mask when performing bone conduction testing place the headphone on the opposite ear so that the receiver Is at the correct height the sound output grid exactly faces the ear canal Adjust the headband of the headphones The receiver on the where the bone conductor Is placed should sit directly on E the cheek bone The marking for air conduction with masking should be done with the symbols A the right side and W the left side on the audiogram form The marking for bone conduction with masking should be done with the symbols the right side and the left side on the audiogram form Picture 16 correct seating of 4 4 4 Automatic masking the bone conductor i With the manual masking as described before you have to readjust the masking level every time you change the test signal level The MA 51 has a tracking feature for easy masking Adjust for the test signal using the level control knob amp then with the masking level
25. es Level step Sound Pressure Level Modulation Functions Warm up time Environment conditions Dimensions Weight Power Supply Power Consumption Device Fuses Geba MA51 Fe 11a doc IEC 645 1 EN 60 645 1 Type 2 IEC 645 2 Type A ANSI S3 6 1996 Type 2 B 125 Hz 250 Hz 500 Hz 750 Hz 1 kHz 1 5 kHz 2 kHz 3 kHz 4 kHz 6 kHz 8 kHz 5 dB or 2 dB level steps user selectable AC with earphone DD45 10 dBHL 120 dBHL 500 Hz 4 kHz 10 dBHL 115 dBHL 250 Hz 8 kHz 10 dBHL 100 dBHL 6 kHz 10 dBHL 110 dBHL 125 Hz 10 dBHL 80 dBHL BC with bone conduction receiver Radioear B 71 10 dBHL 80 dBHL 1000 Hz 10 dBHL 75 dBHL 500 Hz 750 Hz 4 kHz 6 KHz 10 dBHL 60 dBHL 250 Hz 10 dBHL 45 dBHL Insert earohone with optional EAR 3A 10 dBHL 115 dBHL 500 Hz 4 kHz 10 dBHL 110 dBHL 250 Hz 10dBHL 105 dBHL 6kHz 10dBHL 95 dBHL 125 Hz 10 dBHL 90 dBHL 8 kHz 10 dBHL 85 dBHL Pulse tone 0 5 s on off Warble tone triangular freq devitation 5 repetition rate 5 Hz Tone presenter interrupter Tracking fixed level difference between both channels less than 10 min after power on 15 435 59 95F operation 5 4 50T 41 122F storage Maximum humidity 90 storage and operation WxDxH 36x 46x 15cm 14 2 x 18 1 x 5 9 4 6 kg 10 1 Ibs with accessories 5 8 kg 12 8 Ibs 100 240 V 50 60 Hz 10
26. n noise B G V or S is blocked inform the service center When the test tone is heard at the masking ear contact the service center Air Conduction Audiogram Right Ear kHz 025051 k B e on Should et Left Left Farpiec ET Farpiec Right Right Earpiec ey Earpiec ox x Oo AX Should is the last measurement of the patient For inverted measurement please reattach the headphone If the frequency difference between Should and Is for one ear averages more than 10 dB contact the SERVICE CENTER Bone Conduction Audiogram RRighttar level Left Ear peed O Ooo a o kHz 025051 R B EET ORS p p p BE TTT Pf ft TT dBHV TETT TT Bw Eb EEE PE dBHV If the frequency difference between Should and Is for one ear averages more than 10 dB contact the SERVICE CENTER Geba MA51 Fe 11a doc 36 851 407 2 10 11 Operating Instructions MA 51 Specifications are subject to change without notice MAICO Diagnostic GmbH Salzufer 13 14 1058 Berlin Telefon 49 3070 71 46 50 Telefax 49 30 70 71 46 99 e mail export maico biz Internet www maico biz Geba MA51 Fe 11a doc 37 851 407 2 10 11
27. nd there is nothing to see on the LED display Is the power cord plugged in correctly a Check the power fuses JILL Disconnect the power plug unscrew the fuses alongside the power cord socket and check the 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 O or amp does not light A B Press STIM bar or amp When the diode lights picture 31 power socket and fuses up and the tone is available the device works in presenter mode Green STIM LED or amp does light Is level control amp or amp set to an audible level position Are the acoustic receivers connected to the correct socket Is the required receiver with button amp or selected Is the correct LED lit Is the lead connecting the headphones bone conductor or loudspeaker loose or defective No Speechdata Transfer to NOAH MAICO Audiometry module But Tone data Transfer is possible SRT Test is on SRT Test must be Off see chapter 6 14 user menu If your instrument still does not work properly after this short check please consult your dealer or service center Geba_MA51_Fe_11a doc 28 851 407 2 10 11 am 11 Technical Data Operating Instructions MA 51 The MA 51 audiometer is an active diagnostic medical product according to the class Ila of the EU medical directive 0123 93 42 EEC Standards Test Frequenci
28. o hear the speech test material simultaneously This helps in determining if the test word was understood by the patient If the talk back option of the MA 51 is installed the communication from the patient to audiologist will be heard with the monitor phone 00000000 SIGNAL TAPECD MONTOR TB MK SPEECH MK 00 0000 2 T Picture 22 MA 51 rear panel with MONITOR phone output 5 3 2 Adjustment of the monitor phone and talk back microphone To adjust the output level of the monitor phone press the receiver selector key longer than 2 seconds In the middle of the display the text TboP appears Right you see the 28 TboP 80 Picture 23 MA 51 display with adjustment of the monitor phone right and talkback microphone left actual settings of the monitor phone left the setting of the talk back microphone if installed The settings are displayed in of the maximum output level see picture 23 Perform a test signal with Tape CD or the speech microphone Use the right knob amp and adjust the output level of the monitor phone to a level that is comfortable for you If you have an installed talk back microphone speek test words into the microphone and adjust the level with the left knob Store the adjustment by pressing the STIM bar or Geba MA51 Fe 11a doc 19 851 407 2 10 11 M Operating Instructions MA 51 MAICO 5 4 Speech Audiometry The speech recognition threshold SRT is the
29. o select the receiver AC BC FF INSERT The corresponding LED above the key lights Not available receivers will be skipped After a new selection the level will be reset to 30dBHL for the signal and 10dBy for masking 6 3 Signal selection Press either the SIGNAL key to select the signal The kind of masking signal of the opposite masking channel depends on the selected test signal Narrow band noise is used for tone speech masking noise if TAPE CD or MIC for speech audiometry Is selected 6 4 Frequency selection Use the frequency keys amp and to select the frequency The maximum and minimum frequency depends on the receiver you have selected 6 5 Warble tone FM Press the FM key to activate the warble tone Press the FM key again to switch back to pure tone 6 6 Pulse tone Press the PULSE key to activate the pulse tone Press the PULSE key again to deactivate pulsing 6 7 Test channel selection Press the test channel selector key to select the left or right ear for testing For tone presentation one both ears press the channel selector button Guntil both LEDs R and L light Pressing the button several times changes the test channel from R right to L left to RL binaural to R and so on 6 8 Tracking function Press the TRACK key to activate tracking The selected test channel tracks now the masking level at the opposite ear Pre ne TRACK key again to deactivate trackino Geba_MA5
30. omes uncomfortable to the patient This intormation is valuable for determining the patients upper dynamic range limit for proper hearing aid fittings and for determining symptoms of recruitment Warning Because the UCL test uses high sound pressure levels it is extremly important to perform this test using the utmost caution to avoid damaging the ear To prevent the possibility of extreme discomfort by the patient it is important to start the test with levels near the patients MCL Most Comfortable Level The UCL level is described as the level between very loud and loud perception of the test signal Geba MA51 Fe 11a doc 13 851 407 2 10 11 M Operating Instructions MA 51 MAICO Press the test channel selector button longer than 2 seconds 10 10 00 60 The dot in the middle of the Picture 12 MA 51 display for UCL test left LED display moves to the center of the display see picture 12 Start as described in chapter 4 1 with a test level of 60 dBHL Present the tone brietly 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 the headphone see chapter 9 4 3 Bone Conduction BC Testing Bone conduction i e the transmission of sound waves through the
31. on longer than 2 seconds and the dot moves to a position right of the center of the LED display All measured data is now transferred as UCL speech data Attention For using the Speechtest from the NOAH MAICO Audiometry module it is necessary that the SRT Test is Off see chapter 6 14 user menu Geba MA51 Fe 11a doc 26 851 407 2 10 11 M Operating Instructions MA 51 MAICO 9 Care and maintenance of the instrument Disconnect the power plug before cleaning To clean the instrument headphones bone conduction receiver loudspeaker and other accessories use a soft cloth dampened with a little warm soapy water or washing up liquid no alcohol or spirits should be used The ear cushions Z of the headphone can be detached for cleaning To remove the ear cushion Z pull it gently from the earphone To assemble the cleaned or changed ear cushion press It on the earphone and make sure that it sits properly The sound outlet hole must be exactly in the middle of the earphone Picture 30 changing of the ear cushions During cleaning please ensure that no liquid runs into the switches level control headphone capsules or loudspeaker openings Geba MA51 Fe 11a doc 27 851 407 2 10 11 Operating Instructions MA 51 10 Trouble shooting If you should find that your instrument is no longer working properly during a test run please check the following points Diodes in the buttons do not light up a
32. ons MA 51 MAICO Standard accessories 1 air conduction receiver DD 45 1 bone conduction receiver Radio Ear B 71 1 microphone for live speech 1 patient response switch 1 power cord 1 pad of audiogram paper 50 sheets Optional accessories Loudspeaker Canton Part No 801106 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 1162 417 Geba MA51 Fe 11a doc 33 851 407 2 10 11 M Operating Instructions MA 51 MAICO 12 Warranty Maintenance and After Sales Service The MAICO MA 51 is guaranteed for 1 year This warranty is extended to the original purchaser of the instrument by MAICO through the distributor from whom it was purchased and covers defects in material and workmanship for a period of one year from date of delivery oft the instrument to the original purchaser The MA 51 may be repaired and serviced only by your dealer or by a service center recommended by your dealer We urgently advise you against attempting to rectify any faults yourself or commissioning non experts to do SO In the event of repair during the guarantee period please enclose evidence of purchase with the instrument In order to ensure that your instrument works properly the MA 51 should be checked and calibrated at least once a year This check has to be carried out by your dealer When re
33. signs of damage If any damage is noted please notify the carrier immediately Carefully remove the instrument from the shipping box Remove the plastic bag from the instrument and inspect the case for any damage Notify the carrier immediately if any mechanical damage is noted This will assure that a proper claim Is made Save all packing material so the claim adjuster can inspect it as well Notify your dealer or MAICO when the adjuster has completed the inspection SAVE ALL THE ORIGINAL PACKING MATERIAL AND THE SHIPPING CONTAINER SO THE INSTRUMENT CAN BE PROPERLY PACKED IF IT NEEDS TO BE RETURNED FOR SERVICE OR CALIBRATION All accessories are already packaged in the compartment connected with the MA 51 Please check that all accessories listed below are received in good condition If any accessories are missing or damaged immediately notify your dealer or MAICO Standard accessories 1 Headphone DD 45 1 Bone conduction receiver B 71 with headband 1 Patient response switch 1 power cable 1 microphone with stand only for export outside USA 1 audiogram form 50 sheets 1 monitor headset with microphone USA only 5 sound room cords USA only Calibration of the device The instrument headphones bone conduction receiver as well as the optional insert phone and loudspeaker match one another and have the same serial number e g 6631520 Because they have been calibrated with this particular instrument use of o
34. skull directly to the inner ear conways information about the function of the inner ear For a neural hearing loss the values of air conduction chapter 4 1 and bone conduction are the same In this case a hearing loss 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 at the noticeable ledge of the cranial bone behind the auricle see picture 14 The other side of the headband is placed in front of the opposite ear Set the receiver selector amp to BC and the signal selector to TONE Perform the test the same way as for air Picture 14 correct seatin conduction see 4 1 Enter the of the bone conductor measurements for all frequencies on the form connect all points with dotted lines marked on the audiogram form as follows gt right and lt lett For hygienic reasons it is important to clean the bone conductor see chapter 9 Geba MA51 Fe 11a doc 14 851 407 2 10 11 Operating Instructions MA 51 4 4 Masking of the opposite ear The basics of masking are explained below To begin testing immediately please go directly to 4 4 3 Manual masking 4 4 1 Crossover When measuring a pure tone audiogram you assume that the measured hearing threshold is correct But if you recognize that sound is also transmitted through bone conduction over the entire skull it is probable that the opposite ear has also receive
35. tart with AC or Insert The signal will only be presented 1 5 s when the STIM bar IS pressed Invers Tunction for encoders Default setting of STIM MODE Presenter or Interrupter Activates the special MAICO Bone Masking headset Not available in the USA Only accessable if option is purchased Geba MA51 Fe 11a doc 24 851 407 2 10 11 M Operating Instructions MA 51 MAICO 7 Recommended literature Audiometric Interpretation A Manual of Basic Audiometry Lloyd Lyle L and Harriet Kaplan Baltimore University Park Press 1980 Auditory Disorders A Manual for Clinical Evaluation Jerger Susan and James Jerger Boston College Hill Press 1981 Handbook of Clinical Audiology Katz Jack Baltimore William amp Wilkins 1994 Roesers Audiology Desk Reference Roeser Ross J New York Stuttgart Thieme 1996 Auditory Diagnosis Silam Shlomo and Carol A Silvermann San Diego London Singular Publishing Group 1997 Geba MA51 Fe 11a doc 25 851 407 2 10 11 M Operating Instructions MA 51 MAICO 8 Computer interface The MA 51 has a built in serial RS 232 PC interface for data transfer to a connected PC The serial cable to connect the MA 51 with the PC should be a normal non twisted 9 pin extension cable It has a male and a female connector and all wires are direct 1 1 connected It is also sold as monitor extension cable Caution The computer you are using must meet electrical safety requirements such as
36. test You can do this just by pressing the test ear button The corresponding LED L lights and you test the left ear using the controls on the right side The masking is controlled with the level knob on the left side of the instrument For masking see chapter 4 4 bi correct marks in an audiogram are O red right and X blue lett Binaural tone audiometry For tone presentation one both ears press the channel selector button until both LEDs R and L light Pressing the button several times changes the test channel from R right to L left to RL binaural to R and so on The hearing level for the left ear is now adjusted with the level control knob and the knob controls the level for the right ear The test signal can be presented with the according STIM bar and Pulse tone If required the test can also be performed with a pulsed tone Press the PULSE button and the pure tone will be switched 0 25 s on and 0 25 s off Warble tone If required the test can also be performed with a warble tone Press the FM button and the pure tone will frequency modulate The warble tone can also be pulsed as described before For hygienic reasons it is important to clean the ear cushions of the headphone see chapter 9 4 2 Uncomfortable Hearing Level UCL Testing Testing of UCL can be measured using pure tone stimuli or speech live voice or tape CD The purpose is to determine the dB level at which the stimuli bec
37. the test is a HL measurement dot left trom the middle Picture 9 shows the display for a speech UCL test In the middle of the LED display amp the result of speech discrimination 42 in per cent are shown The dot right from the center indicates that a UCL test is done The dot in the middle stand in speech mode for single syllable test The dot left from the center stands for multi syllable speech test Geba MA51 Fe 11a doc 11 851 407 2 10 11 Operating Instructions MA 51 4 Pure tone audiometry 4 1 Air Conduction AC Testing In the hearing threshold test the hearing threshold of the patient is measured in comparison with the normal hearing threshold for air conduction The test is started on the ear with better hearing The patient should sit at a distance of at least 1 m from the device Eliminate any obstructions which will interfere with the placement of the earphone cushions on the ear i e hair eyeglasses Ensure the headphones are put on correctly Red side on the right blue side on the lett Adjust the headband of the headphones so that the receivers are at the correct height the sound output grid amp exactly facing the ear canal Start with the better indicated ear at 1 kHz After switching on the frequency is automatically set to 1 kHz In the following example we assume that the right is the better ear Set the receiver selector amp to AC and the signal selector to TONE
38. ther transducers Is not allowed If one of the acoustic transducers is replaced the instrument must be recalibrated The use of non calibrated audiometers leads to incorrect measurements Geba MA51 Fe 11a doc 7 851 407 2 10 11 MAICO 3 2 Preparing the MA 51 for use The MA 51 with its integrated compartment for the accessories is perfect for portable use The rugged housing light weight and_ the comfortable handle make it easy and convenient to transport the instrument Carry it as shown with the bottom away from the leg That helps protect the front cover from damage and due to the asymmetrical handle position it provides more space for your leg To get started first move the handle under the housing Unlatch the cover by pressing in the two black locks located on the left and right sides near the front of the instrument Open the front cover and rest it on the back cover of the accessory compartment To open the compartment press the two black locks in the upper middle of the instrument Open the compartment cover as seen in picture 2 Take the headphone the bone conduction receiver the patient response switch and the microphone out of the compartment and connect the power cable to power The MA 51 operates with voltages trom 96 to 240 V AC 44 Hz to 440 Hz To avoid pinching the cables when closing the cover lay the cables in the slots provided Close the back cover and latch it with slight pressure You can place the
39. turning the instrument for repairs it is essential to send the headphones as well Send the device to your dealer or to a service center authorized by your dealer Please include a detailed description of faults In order to prevent damage in transit please use the original packing if possible when returning the Instrument Within the European Union it is illegal to dispose electric and electronic waste as unsorted municipal waste According to this all MAICO products sold after August 13 2005 are marked with a crossed out wheeled bin Within the limits of Article 9 of DIRECTIVE 2002 96 EC on waste electrical and electronic equipment WEEE MAICO has changed their sales policy To avoid additional distribution costs we assign the responsibility tor the proper collection and treatment according legal regulations to our customers Geba_MA51_Fe_11a doc 34 851 407 2 10 11 Operating Instructions MA 51 13 Safety Regulations 13 1 Electrical Safety The MA 51 audiometer is constructed to comply with protection class Il of the international standard IEC 601 1 EN 60601 1 Protection from an electric shock is ensured even without the system earth connection The instruments are not intended for operation in areas with an explosion hazard 13 2 Measuring security To guarantee that the audiometer works properly the instrument has to be checked and calibrated at least once a year The service and calibration must be performed by an
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