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Operating Instructions MA 53

Geba_MA53_e_13a.doc

29 851 430/3 11/11

If you are working online with a PC press the STIM bar



or ↔



to transfer the

test result to the PC (see also chapter 9).
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



or



and

proceed as described before.

5.6 Masking

Speech audiometry has similar masking rules to those described 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 53 automatically performs speech masking noise.

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Содержание MA 53

Страница 1: ...MAICO Diagnostic GmbH Operating Instructions MAICO MA 53 MAICO Diagnostic GmbH Salzufer 13 14 D 10587 BERLIN Tel 49 30 70714650 Fax 49 30 70714699...

Страница 2: ......

Страница 3: ...e tone audiometry 13 4 1 Air Conduction AC Testing 13 4 2 Uncomfortable Hearing Level UCL Testing 14 4 3 Bone Conduction BC Testing 15 4 4 Masking of the opposite ear 16 4 4 1 Crossover 16 4 4 2 Maski...

Страница 4: ...tor phone 27 5 3 1 Connection of the monitor phone 27 5 3 2 Adjustment of the monitor phone 27 5 4 Speech Audiometry 28 5 6 Masking 29 6 Quick reference guide 30 6 1 Startup settings 30 6 2 Receiver s...

Страница 5: ...onnection of the talk back microphone 37 7 3 2 Adjustment of the talk back microphone 37 7 4 Assistant phone 38 7 4 1 Connection of the assistant phone 38 7 4 2 Adjustment of the assistant phone 38 8...

Страница 6: ...P which allows implementing new test signals just with a software upgrade And because MA 53 functions are software controlled upgrading later to new extended measurement functions will be simple and i...

Страница 7: ...from 20 dBHL to 120 dBHL Bone conduction BC can be tested with 11 test frequencies from 125 Hz to 8 kHz with levels from 10 dBHL to 70 dB HL with the standard bone conductor B 71 the frequency range i...

Страница 8: ...mely reliable The audiometer is designed to be extremely service friendly Automatic test programs make trouble shooting and the yearly calibration as easy as possible PC Interface A serial RS 232C int...

Страница 9: ...PACKED IF IT NEEDS TO BE RETURNED FOR SERVICE OR CALIBRATION All accessories are already packaged in the compartment connected with the MA 53 Please check that all accessories listed below are receive...

Страница 10: ...he 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...

Страница 11: ...ceiver selectors and and the signal selectors and are lighted The frequency is set to 1 kHz and the level to 30 dBHL for the left channel 10 dBHL noise for the right All these settings are also shown...

Страница 12: ...ency left blue talk over microphone switches on the talk over microphone as long as the button is pressed The level can be adjusted with the knobs or The actual value is displayed in dBHL at the lower...

Страница 13: ...pe CD or microphone or noise or switches the channel off 2nd Level adjustment of talkback microphone and monitor phone right red channel receiver selector changes the receiver from AC to BC or FF or I...

Страница 14: ...utton or is pressed and the audiologist talks to the patient with 70 dBHL The HL in the upper row before 1500 Hz indicates that the current measurement is stored as Hearing Level threshold test Pictur...

Страница 15: ...indicated ear at 1 kHz After switching on the frequency is automatically set to 1 kHz In the following example we assume that the left is the better ear Set the receiver selector to AC and the signal...

Страница 16: ...and right display text is changed see picture 13 The correct marks in an audiogram are O red right and X blue left Pulse tone If required the test can also be performed with a pulsed tone Press the P...

Страница 17: ...esting Bone conduction i e the transmission of sound waves through the skull directly to the inner ear conways information about the function of the inner ear For a neural hearing loss the values of a...

Страница 18: ...called interaural attenuation For bone conduction measurement the interaural attenuation is 0 to 15 dB Bone conduction crossover is therefore possible even with a slight difference in hearing loss bet...

Страница 19: ...t side on the audiogram form The marking for bone conduction with masking should be done with the symbols the right side and the left side on the audiogram form 4 4 4 Automatic masking With the manual...

Страница 20: ...ntensity of the tone in the hearing impaired ear is varied until the loudness of the tone is judged by the patient to be equivalent to a tone at a constant intensity in the normal ear This is called l...

Страница 21: ...test select a modulation amplitude from 0 5 dB to 4 0 dB in the suprathreshold menu as decribed before under 4 5 1 and press the STIM bar or The LCD display shows DLI along with the chosen modulation...

Страница 22: ...ss the STIM bar or The display changes to the SISI conditioning screen as shown in picture 19 Select the test frequency with the frequency keys or For the test you should choose the frequency where th...

Страница 23: ...4 5 1 3 3 SISI Test If the patient has understood the test up to here press the PULSE button again to start the SISI test The LCD display indicates SISI test see picture 21 and the modulation level is...

Страница 24: ...0 dB below the admitted threshold If the loss in the poorer ear is real the patient will be unaware of the signal in that ear and will respond only to the tone in the good ear If the patient does not...

Страница 25: ...d to detect frequency disorders To enable the dual frequency mode press the left frequency up key and frequency down key simultaneously The LCD display shows the test frequency of the left channel on...

Страница 26: ...he individual hearing performance They are especially useful for the early detection of hearing damages of younger persons The headphone Sennheiser HDA 200 is designed for high frequency audiometry Th...

Страница 27: ...ou are using a CD or tape player powered by electrical current the player must meet electrical safety requirements such as IEC 601 1 or UL This is to avoid electrical shock of either the patient or yo...

Страница 28: ...ave a reference signal such as a reference tone or speech simulating noise Perform the reference signal with CD Use the left knob for the left channel and the right knob for the right channel and adju...

Страница 29: ...The monitor phone allows you and the patient to 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...

Страница 30: ...correctly Red side on the right blue side on the left Adjust the headband of the headphones so that the receivers are at the correct height the sound output grid exactly facing the ear canal Set the...

Страница 31: ...form 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 or and proceed as described...

Страница 32: ...signal The kind of NOISE signal depends on the signal of the opposite channel Speech masking noise is used if on the opposite channel the speech signal is selected see 6 4 below The display shows the...

Страница 33: ...ULSE key select the test and parameter Press one of the STIM bars or to select your choice The lower area of the display is cleared and the selected test is shown on the display The light above the PU...

Страница 34: ...ge the left and right channel The big letters R and L will be swapped in the display and the light above the SWAP key is on Press the SWAP key again to deactivate swapping 6 10 Tracking function Press...

Страница 35: ...nds and the volume control bars for TB and monitor are shown Adjust the monitor volume with the right knob Adjust the talkback microphone volume with the left knob To store the actual settings press o...

Страница 36: ...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 functions U...

Страница 37: ...C Start Tone NBN Initial masking setting of right channel on off Language Select Submenu to select language Presenter 1 5s The signal will only 1 5 s presented when the STIM bar is pressed Invers Dial...

Страница 38: ...xing on the left ear Store the selection by pressing the STIM bar or The LCD display now shows the actual setting for mixing In the example picture 40 is a pure tone with a level of 30 dBHL and a narr...

Страница 39: ...nication from the patient to the operator will be heard with the monitor phone 7 3 1 Connection of the talk back microphone Connect the talk back microphone plug to the TB MIC connector at the rear pa...

Страница 40: ...nnection of the assistant phone Connect the assistant phone with the attached connecting cable together with the talk back microphone to the TB MIC connector at the rear panel of the MA 53 see picture...

Страница 41: ...e 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...

Страница 42: ...ta is now transferred as UCL data To test the most comfortable level MCL press the receiver selector button or longer than 2 seconds and the LCD display in the upper row changes from UL to ML All meas...

Страница 43: ...oapy water or washing up liquid no alcohol or spirits should be used The ear cushions of the headphone can be detached for cleaning To remove the ear cushion pull it gently from the earphone To assemb...

Страница 44: ...is broken please insert new fuses 1 A slow blow Diodes light up but test tone is absent Green STIM LED or does not glow Press STIM bar or When the diode illuminate and the tone is available the device...

Страница 45: ...9 kHz 10kHz 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 DD45 10 dBHL 120 dBHL 500 Hz 4 kHz 10 d...

Страница 46: ...Test Signal Pure tone pulse tone warble tone narrowband noise broadband noise speech masking noise Modulation Pulse tone 0 5 s on off Warble tone triangular freq deviation 5 repetition rate 5 Hz Test...

Страница 47: ...storage Maximum humidity 90 storage and operation According to water ordinary equipment According to sterilization not applicable Dimensions W x D x H 36 x 46 x 15 cm 14 2 x 18 1 x 5 9 Weight 4 6 kg 1...

Страница 48: ...ve GND tip in ZI 47 k UI 0 04 5 Veff K masking phone for BC option sleeve GND tip out ZA 10 UA 1 Veff L tape CD input right channel sleeve GND tip in ZI 47 k UI 0 04 5 Veff M tape CD input left channe...

Страница 49: ...dB 125 47 5 47 5 3 250 27 0 27 0 5 500 13 0 13 0 7 750 6 5 6 5 1000 6 0 6 0 15 1500 8 0 8 0 2000 8 0 8 0 26 3000 7 5 7 5 4000 9 5 9 5 32 6000 20 5 20 5 8000 12 0 12 0 24 Calibration values BC Receive...

Страница 50: ...d pressure level Sound damping ISO 389 5 with Coupler IEC 318 and 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 5 250 18 0 16 0 500 9 5 22 5...

Страница 51: ...11 500 4 4 750 2 2 1000 2 2 1500 0 5 0 5 2000 1 5 1 5 3000 6 6 4000 6 5 6 5 6000 2 5 2 5 8000 11 5 11 5 Calibration values Insert phone Eartone 3A Frequency Hz Reference equivalent threshold sound pr...

Страница 52: ...sponse switch 1 power cord 1 pad of audiogram paper 50 sheets Optional accessories Loudspeaker Canton single unit Part No 801165 Portable Loudspeaker SBC pair Part No 802092 not available in the USA I...

Страница 53: ...ur instrument works properly the MA 53 should be checked and calibrated at least once a year This check has to be carried out by your dealer When returning the instrument for repairs it is essential t...

Страница 54: ...is not allowed 14 3 Device control The user of the instrument should perform a subjective instrument check once a week This check can be done following the list for subjective instrument check see ne...

Страница 55: ...30dB HL 50dB HL 70dB HL BC 30dB HL 50dB HL When noise B G V or S has been checked please inform your service center If conduction test signals are also audible in the non test ear please inform your s...

Страница 56: ...53 Geba_MA53_e_13a doc 54 851 430 3 11 11 Specifications are subject to change MAICO Diagnostic GmbH Salzufer 13 14 1058 Berlin Telefon 49 3070 71 46 50 Telefax 49 30 70 71 46 99 Email export maico b...

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