Operating Instructions MA 53
Geba_MA53_e_13a.doc
33 851 430/3 11/11
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). In modes where no interlock is available the display
shows
No Interlock.
Press the STIM MODE key
longer than 2 seconds to deactivate the interlock
function.
6.13 Talk over microphone
Press one of the TALK OVER keys
and
. In the lower area of the display
the volume level of the talk over microphone is shown.
Adjust the talk forward volume with the left
or right
↕ knob.
Release the TALK OVER key
or
if you have finished talking to the patient.
6.14 Talkback microphone and Monitor volume control
Press the right SIGNAL key
longer than 2 seconds 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 one of the STIM bars
or
↔.
6.15 Speech audiometry
To select speech audiometry switch both channels to TAPE/CD or MIC by
using the SIGNAL selector keys
and
. In speech mode the display
shows
the percentage of correct repeated words. Below this percentage the number
of correct and wrong receipted words is shown.
To count the correct words press one of the frequency up keys
or
→.
To count the wrong words press one of the frequency down keys
or
.
To clear the counter press the FM key
.
6.16 Speech calibration
To calibrate the speech inputs Tape/CD or MIC select the signal you’d like to
calibrate with the left SIGNAL selector key
.
Press the left SIGNAL key
longer than 2 seconds. In the lower area of the
display
the text Calibration appears. Perform the reference signal with
Tape, CD or microphone. Use the left knob
for the left channel and the
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