Operating Instructions
MAICO MA 50
Страница 1: ...Operating Instructions MAICO MA 50...
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Страница 3: ...display of the MA 50 8 4 Pure tone audiometry 9 4 1 Air Conduction AC Testing 9 4 2 Uncomfortable Hearing Level UCL Testing 10 4 3 Bone Conduction BC Testing 11 4 4 Masking of the opposite ear 11 4 4...
Страница 4: ...nded literature 16 7 Computer interface 17 8 Care and maintenance of the instrument 18 9 Trouble shooting 19 10 Technical Data 20 11 Warranty Maintenance and After Sales Service 24 12 Safety Regulatio...
Страница 5: ...d And because MA 50 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 adjus...
Страница 6: ...dBHL to 120 dBHL with 11 test frequencies from 125 Hz to 8 kHz The hearing level is controlled independently for the signal and the masking channel by two detented knobs on the left and right of the i...
Страница 7: ...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 wit...
Страница 8: ...phone out of the compartment and connect the power cable to power The MA 50 operates with voltages from 96 to 240 V AC 44 Hz to 440 Hz To avoid pinching the cables when closing the cover lay the cable...
Страница 9: ...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 on the left sid...
Страница 10: ...ic tracking see chapter 4 4 masking channel selector key selects the right or left test ear 3 3 2 The display of the MA 50 The bright LED Display of the MA 50 shows levels and frequency The display sh...
Страница 11: ...cy is automatically set to 1 kHz In the following example we assume that the right is the better ear Set the receiver selector to AC Set the left level control knob to a value just below expected hear...
Страница 12: ...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 8 4 2 Uncom...
Страница 13: ...14 The other side of the headband is placed in front of the opposite ear Set the receiver selector to BC Perform the test the same way as for air conduction see 4 1 Enter the measurements for all fre...
Страница 14: ...e 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 lead t...
Страница 15: ...a tracking feature for easy masking Adjust for the test signal using the level control knob then with the masking level control knob adjust for the corresponding masking level Now press the TRACK butt...
Страница 16: ...he signal and 10dBHL for masking 5 3 Frequency selection Use the frequency keys and to select the frequency The maximum and minimum frequency depends on the receiver you have selected 5 4 Warble tone...
Страница 17: ...uous 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 presen...
Страница 18: ...re 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 Willia...
Страница 19: ...ine transferred to the PC and stored in the database In pure tone audiometry initially all measured data is transferred as hearing threshold data This is indicated by the dot left from the center of t...
Страница 20: ...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...
Страница 21: ...ss 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 th...
Страница 22: ...HL 40 dBHL 125 Hz 8 kHz no output speech 10 dBHL 85 dBHL Insert earphone with optional EAR 3A 10 dBHL 120 dBHL 750 Hz 1 5 kHz 10 dBHL 115 dBHL 500 Hz 4 kHz 10 dBHL 110 dBHL 250 Hz 10 dBHL 105 dBHL 6 k...
Страница 23: ...t 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 RI 500 BC bone conduction receiver sleeve GND tip out ZA 4 UA 8 Veff...
Страница 24: ...BS 9A dB re 20 Pa dB 125 45 45 3 250 25 5 25 5 5 500 11 5 11 5 7 750 7 5 8 1000 7 7 15 1500 6 5 6 5 2000 9 9 26 3000 10 10 4000 9 5 9 5 32 6000 15 5 15 5 8000 13 13 24 Calibration values BC Receiver R...
Страница 25: ...6 1 with Coupler HA 2 dB re 20 Pa dB 125 26 26 32 5 250 14 14 36 500 5 5 5 5 37 5 750 2 2 1000 0 0 36 5 1500 2 2 2000 3 3 33 3000 3 5 3 5 4000 5 5 5 5 39 5 6000 2 2 8000 0 0 42 5 Standard accessories...
Страница 26: ...our instrument works properly the MA 50 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...
Страница 27: ...he 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 authorized service center In accordance with the r...
Страница 28: ...l Left Ear kHz 0 25 0 5 1 2 3 4 6 8 0 25 0 5 1 2 3 4 6 8 kHz LL 30dB HL 50dB HL 70dB HL KL 30dB HL 50dB HL When noise B G V or S is blocked inform the service center When the test tone is heard at the...
Страница 29: ...50 Geba_MA50_Fe_11a doc 27 851 406 2 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 e mail export maico...
