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Operating Instructions MA 42
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Use the frequency plus (4) or minus (5) keys to increase or decrease the
frequency. Press the STIM button (the blue part next to the attenuator knobs)
to present or interrupt the tone. The status LED above the STIM Mode button
will flash when the tone is presented.
Follow your preferred procedure for the evaluation of the hearing threshold.
Note: A warning prompt appears on the display in the event that the
hearing level exceeds 100 dB
HL
. The warning prompt disappears after
approximately 1 second. As long as the prompt is visible on the display,
no further entries can be made.
Test through the frequencies: Starting at 1000 Hz, set the higher frequencies
first, then the lower frequencies.
Use the frequency up key (4) to select the next higher frequency and use the
frequency down key (5) to select the next lower frequency.
Select the next frequency, increase the level again and proceed with presenting
the test signal as described before.
Once a threshold value is established, press the STORE (3) key in order to store
the threshold. The appropriate symbol will be plotted on the audiogram.
If the patient is not responding, the current value can be marked as “no
response” by holding the store button pressed for 3 seconds. Once all
frequencies are tested, choose the poorer ear and repeat the hearing threshold
test.
Pulse tone
If required, the test can also be performed with a pulsed tone. Set the test signal
button (12) on PULSE and the pure tone will be switched to a pulsing tone.
Warble tone
If required, the test can also be performed with a warble tone. Press the button
(12) and the pure tone will frequency modulate. The warble tone can also be
pulsed as described before.
Noise
The signal may be changed from a pure tone to narrow-band noise or white
noise by pressing the signal key (11), (15) underneath the display, whichever
one corresponds to the current test channel. This will change the status
displayed in the test channel from “Tone” to “Noise”.
Summary of Contents for MA 42
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