Operating Instructions MA 42
Operating_Instructions_8100460-6_MA42_e_15a 37 8100460-6 1/15
Talk over microphone
Press and hold the STIM MODE (8) to activate Talk forward. Adjust the level by
turning one of the attenuator knobs (1) while in the mode.
Talkback microphone and Monitor volume control
Press the Monitor key on the left side of the display and the volume control
bars for Talk Back and monitor are shown.
Adjust the monitor volume with the right and left controls (1). Adjust the
talkback microphone volume with the plus/minus keys (4) or (5). To store the
actual settings press Exit (19).
6.2.3 Speech audiometry
To select speech audiometry, select Speech (18) and SRT or WRS test (13). For
the SRT test the current level need to be adapted in order to establish the level
for 50% correct word recognition. Use the frequency up (4) and down (5) key
to select a word in the word list.
For the WRS test the display shows the percentage of correctly repeated words.
To count the correct words press one of the frequency up (4) keys.
To count the wrong words press one of the frequency down (5) keys.
To clear the counter, press the Reset key (7) on the left side of the display.
Speech calibration
To calibrate the MIC or CD speech input select the input with the SIGNAL
selector key (11). Press the Monitor button (6), the monitor setting screen
appears, press now the Incal button (19) on the right side of the display and
the calibration screen appears.
Play the reference signal with CD or talk into the microphone. Use the left or
right level control (1) and adjust the levels until the VU-meter show all yellow
and one green light. If one or more red lights are on, reduce the level using the
corresponding dials (1).
Store the calibration and leave the calibration mode with the OK (6) button on
the left side of the display.
6.2.4 Documentation of the results
Printout
Enter the User Menu by pressing the functional button (19) and press the
button Print (13) to printout the results.
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