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Maico MA 53 Operating Instructions Manual

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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

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  • Page 1: Operating Instructions

    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...

  • Page 3: Table Of Contents

    2 Description ....................5 3 Getting started ..................7 3.1 Unpacking your instrument ..............7 3.2 Preparing the MA 53 for use ..............8 3.3 Getting familiar with the MA 53 ............9 3.3.1 Using the keyboard of the MA 53..........10 3.3.2 The display of the MA 53 ..............
  • Page 4 Operating Instructions MA 53 5.1 Connecting the speech source ............. 25 5.1.1 Connecting a CD-player ..............25 5.1.2 Connecting a Microphone ............. 25 5.2 Speech calibration ................26 5.2.1 Calibration of the CD with speech test material ......26 5.2.2 Calibration of the microphone for live speech test ......26 5.3 Connection and calibration of the monitor phone ........
  • Page 5 Operating Instructions MA 53 6.14 Talkback microphone and Monitor volume control ......33 6.15 Speech audiometry ................33 6.16 Speech calibration ................33 6.17 User menu ..................34 7 Advanced features .................. 36 7.1 Complex mixing .................. 36 7.2 Advanced Noise Selection ..............37 7.3 Talk-back microphone .................

  • Page 6: Introduction

    CE-symbol according to Medical Directive 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 implementing new test signals just with a software upgrade.

  • Page 7: Description

    HDA 200, 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 53 has stereophonic microphone inputs for live speech audiometry, an input for an optional tape/CD player with speech test material and an additional input for a second tape/CD player (i.e.
  • Page 8 The large backlighted LCD-display shows level, frequency, transducer, signal and other information for each channel. As a result of modern microprocessor technology, the MA 53 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.

  • Page 9: Getting Started

    3 Getting started 3.1 Unpacking your instrument Your MA 53 was carefully inspected and packed for shipping. However, it is a good practice to thoroughly inspect the outside of the shipping box for signs of damage. If any damage is noted, please notify the carrier immediately.

  • Page 10: Preparing The Ma 53 For Use

    You can place the microphone or a tape or CD- player on top of the cover (see picture 3). The MA 53 should be operated in a quiet room, so that the audiometric examinations are not influenced by outside noises. For use in noisier environments headphones with optional sound insulation muffs are available.

  • Page 11: Getting Familiar With The Ma 53

    3.3 Getting familiar with the MA 53 Turn on the instrument with the power switch  which is located at the right side of the MA 53. The device performs its initial test and autocalibration. If an error is detected the test is stopped and a description of the error is shown on the LCD-display .

  • Page 12: Using The Keyboard Of The Ma 53

    Operating Instructions MA 53 selected. The frequency is changed with up , → and down ,  buttons for both channels together. The design of the MA 53 makes it easy to control level, signal presentation and frequency with one hand.
  • Page 13 Picture 8 MA 53 keyboard 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 INSERT (if option assembled).

  • Page 14: The Display Of The Ma 53

    The LCD-display  has an energy saver function: the backlight of the display is automatically switched out after approximately three minutes. Any action with the MA 53 such as pressing a button or turning the knobs switches the backlight immediately on again.

  • Page 15: Pure Tone Audiometry

    If the patient doesn’t hear the test tone, increase the level with the level control knob . Proceed with presenting test signal Picture 12 MA 53 controls and display for air conduction described before. threshold test of the left ear Geba_MA53_e_13a.doc 851 430/3 11/11...

  • Page 16: Uncomfortable Hearing Level (Ucl) Testing

    Operating Instructions MA 53 When you find a stable threshold value, note the level and frequency. If the MA 53 is connected to a PC, the value was stored with your last STIM presentation. Test through the frequencies. Starting at 1 kHz set the higher frequencies first then the lower frequencies.

  • Page 17: Bone Conduction (Bc) Testing

    HL to UL (see picture 14). Start as described in chapter 4.1 with a Picture 14 MA 53 display for UCL-test left test level of 60 dB Present the tone briefly (max. 1s) If the signal was recognized by the patient as not uncomfortable increase the level and proceed as described before.

  • Page 18: Masking Of The Opposite Ear

    Operating Instructions MA 53 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.

  • Page 19: Automatic Masking

    4.4.4 Automatic masking: With the manual masking, as described before, you have to readjust the masking level every time you change the test signal level. The MA 53 has a tracking feature for easy masking. Adjust for the test signal using the level control knob or ↕, then with the opposite level control knob ...

  • Page 20: Diagnostic Tests

    Operating Instructions MA 53 4.5 Diagnostic tests 4.5.1 Suprathreshold tests The MA 53 offers additional suprathreshold tests which can offer more information about the kind of the hearing loss. To access suprathreshold tests press the PULSE button  longer than two seconds.
  • Page 21 0.5 dB to 4.0 dB in the suprathreshold menu (as decribed before under 4.5.1) and press the STIM bar  or Picture 18 MA 53 display with DLI test ↔. The LCD-display  shows DLI, along with the chosen modulation amplitude (see picture 18).
  • Page 22 (as decribed before under 4.5) and press the STIM bar  or ↔. The display  changes to the SISI conditioning screen (as shown in picture Picture 19 MA 53 display with 19). SISI conditioning 5dB Select the test frequency with the frequency keys /...
  • Page 23 SISI test. The LCD-display indicates SISI test (see picture 21) and the modulation level is Picture 21 MA 53 display with SISI test adjusted to 1 dB. Now 20 increments will be presented to the patient. You can delay the test for the time you press STIM bar  or ↔. This could be...

  • Page 24: The Stenger Test

    The PAT response LED  lights and after two seconds a bar stop watch with a scale from 0 to 60 seconds appears on the lower Picture 24 MA 53 display with area of the LCD-display  (see picture 24). initial tone decay test Geba_MA53_e_13a.doc...

  • Page 25: Dual Frequency Mode

    4.6 Dual Frequency Mode The MA 53 offers the dual frequency mode to the right and the left ear with different frequencies. This “true two channel” feature can be used to detect frequency disorders.

  • Page 26: Free Tunable Frequencies In 1 Hz Steps (Ftf)

    AC receivers for all AC tests or to use two AC-receivers with the MA 53. In this case the normal AC receiver (DD45) goes up to 8000 Hz. The HDA 200 is selected with the receiver selector key ...

  • Page 27: Speech Audiometry

    TAPE/CD input or tape you can place it on top of the cover of the MA 53. This saves space and makes the usage of the CD-player or tape very convenient. Caution: If you are using a CD- or tape-player powered by electrical current, the player must meet electrical safety requirements, such as IEC 601-1 or UL.

  • Page 28: Speech Calibration

    Operating Instructions MA 53 5.2 Speech calibration 5.2.1 Calibration of the CD with speech test material The MA 53 must be calibrated to the particular speech test material in use to ensure valid test levels. That means every time you change the CD or tape you must recalibrate the instrument.

  • Page 29: Connection And Calibration Of The Monitor Phone

    5.3.1 Connection of the monitor phone Connect the monitor phone plug E to the MONITOR connector  at the rear panel of the MA 53 (see picture 34).To avoid pinching the cables when closing the cover, lay the cables in the slots provided. The...

  • Page 30: Speech Audiometry

    (see picture appears. The percent speech discrimination score is displayed in the middle. Below this, Picture 36 MA 53 display with initial settings for speech audiometry the number of correct and incorrect words is shown. If you are using CD or tape, put the monitor phone on to hear the test words.

  • Page 31: 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. Geba_MA53_e_13a.doc 851 430/3 11/11...

  • Page 32: Quick Reference Guide

    Operating Instructions MA 53 6 Quick reference guide 6.1 Startup settings Air conduction on both channels Pure tone on both channels 30dBHL on both channels Presenter mode 6.2 Receiver selection Press either the right  or left  RECEIVER key to select the receiver (AC, BC, FF, INSERT).

  • Page 33: Frequency Selection

    Operating Instructions MA 53 6.5 Frequency selection Use one of the two sets of frequency keys / or / to select the frequency. The maximum and minimum frequency depends on the receiver you have selected. 6.6 Warble tone (FM) Press the FM key  to activate the warble tone. Warble is shown in the display .

  • Page 34: Decay Test (Carhart)

    Operating Instructions MA 53 To cancel the conditioning and the SISI test and to return to standard operation press the SWAP key . After 20 increments the SISI test is finished. The text SISI Result with the result in percentage is shown.

  • Page 35: Interlock Function

    Operating Instructions MA 53 6.12 Interlock function Press the STIM MODE key  longer than 2 seconds to activate the interlock function. The display  shows the text Interlock. Interlock works only if both channels have the same kind of signal (Speech, tone or noise).

  • Page 36: User Menu

    Operating Instructions MA 53 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 red lights are on, reduce the level using the corresponding knobs  or ↕.
  • Page 37 Changes direction of level control dials  and ↕ Interru./Present Default setting STIM MODE (Presenter Interrupter) Bone-Mask-System* Activates the special MAICO Bone Masking headset (not available in the USA) * = only accessible if option is purchased Geba_MA53_e_13a.doc 851 430/3 11/11...

  • Page 38: Advanced Features

    7 Advanced features 7.1 Complex mixing The complex mixing feature of the MA 53 allows the operator to route two different test signals to the same ear. The test signals and the test levels are independently adjustable but will be presented to one ear (ipsilateral). This...

  • Page 39: Advanced Noise Selection

    Operating Instructions MA 53 7.2 Advanced Noise Selection The MA 53 offers for advanced masking or testing the selection of narrow band noise, speech masking noise and white noise as test signal. Enable this feature from the user setup menu The additional signals are now available as test signals.

  • Page 40: Assistant Phone

     at the rear panel of the MA 53 (see picture 43).To avoid pinching the cables when closing the cover, lay the cables in the Picture 43 MA 53 rear panelwith TALK- slots provided.

  • Page 41: Recommended Literature

    Operating Instructions MA 53 8 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...

  • Page 42: Computer Interface

    Operating Instructions MA 53 9 Computer interface The MA 53 can be connected for data transfer to a PC. Caution: The computer you are using must meet electrical safety requirements, such as IEC 601-1 or UL. This is to avoid electrical shock of either the patient or you.

  • Page 43: Care And Maintenance Of The Instrument

    Operating Instructions MA 53 10 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.

  • Page 44: Trouble Shooting

    Operating Instructions MA 53 11 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 and there is nothing to see on the LCD-display : Is the power cord plugged in correctly? Check the power fuses ♦.

  • Page 45: Technical Data

    Operating Instructions MA 53 12 Technical Data The MA 53 audiometer is an active, diagnostic medical product according to the class IIa of the EU medical directive 93/42/EEC. Standards: IEC 601-1class II, protection class BF IEC 645-1/ EN 60 645-1: Type 2 IEC 645-2: Type A ANSI S3.6-1996: Type 1 HF A...
  • Page 46 Operating Instructions MA 53 FF with optional - 10 dBHL... 90 dBHL loudspeaker type (measurement in 1m distance) Canton: ( 1 kHz, 1.5 kHz -10 dBHL ... 85 dBHL) ( 500 Hz, 750 Hz -10 dBHL ... 80 dBHL) ( 250 Hz, 6 kHz, 8 kHz -10 dBHL ...
  • Page 47 Operating Instructions MA 53 + 15 ... + 35 C / + 59 ... + 95 °F (operation) Environment conditions: + 5 ... + 50 C / + 41 ... + 122 °F (storage) Maximum humidity 90 % (storage and...
  • Page 48 ZA=10 , UI= 0.38 U live voice microphone sleeve=GND, tip=in ZI= 1 k - 500 mVeff , UA=1 Veff V AC (headphone) left channel sleeve=GND, tip=out ZA=10 Picture 55 rear of MA 53 with connection plugs Geba_MA53_e_13a.doc 851 430/3 11/11...
  • Page 49 Operating Instructions MA 53 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 Pa [dB] (re 20 Pa...
  • Page 50 Operating Instructions MA 53 Calibration values: AC-High Frequency Receiver Sennheiser HDA 200 Force: 9 ... 10N Reference equivalent threshold Frequency [Hz] sound pressure level Sound damping ISO 389 - 5 ANSI S3.6-1 with Coupler IEC 318 with Coupler IEC 318...
  • Page 51 Operating Instructions MA 53 Calibration values: FF : Free sound field (0 degree incidence) Reference equivalent threshold Frequency [Hz] sound pressure level ISO 389 - 7 ANSI S3.6-1996 [dB] (re 20 Pa [dB] (re 20 Pa 1000 1500 2000 -1.5 -1.5...
  • Page 52 Operating Instructions MA 53 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 (single unit) Part No.

  • Page 53: Warranty, Maintenance And After-Sales Service

    The MA 53 may be repaired and serviced only by your dealer or by a service center recommended by your dealer. We urgently advise you against...

  • Page 54: Safety Regulations

    Operating Instructions MA 53 14 Safety Regulations 14.1 Electrical Safety: The MA 52 audiometer is constructed to comply with protection class II of the international standard IEC 601-1 (EN 60601-1). Protection from an electric shock is ensured even without the system earth connection.

  • Page 55: Operating Instructions Ma

    Operating Instructions MA 53 Checklist for Subjective Audiometer Testing - Clean the ear and head cushion! Instrument:........- Untangle all lines when necessary Manufacturer:…........ - Are the headphone cushions in good condition? If not  replace Serial No.:......... - Are plugs and leads in good condition / undamaged? - Are all controls working properly? Examiner:........
  • Page 56 Operating Instructions MA 53 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.biz Internet: www.maico.biz Geba_MA53_e_13a.doc 851 430/3 11/11...

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