Operating Instructions MA 53
Geba_MA53_e_13a.doc
26 851 430/3 11/11
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.
To calibrate the Tape/CD speech input
select TAPE/CD 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. You also see the
actual settings in % of the maximum
calibration for both channels (see picture
32).
On every CD or tape with speech test
material you have a reference signal, such
as a reference tone or speech simulating
noise.
Perform the reference signal with CD.
Use the left knob
for the left channel and the 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
↕.
Store the calibration by pressing the STIM bar
or
↔.
5.2.2 Calibration of the microphone for live speech test
To calibrate the SPEECH MIC input select
MIC 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. You also see the actual
Picture 31 MA 53 controls and displays
for speech calibration
Picture 32 MA 53 display with
speech calibration of CD-player or tape
Picture 33 MA 53 display with
speech calibration of the microphone
Содержание MA 53
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