Operating Instructions MA 53
Geba_MA53_e_13a.doc
9 851 430/3 11/11
The test room must be at normal temperature, usually 15 C / 59 F to 35 C /
95 F, and the instrument should be switched on about 10 minutes before the
first measurement to guarantee precise measuring results. If the device has
been cooled down (e.g. during transport), please wait until it has warmed up
to room temperature.
3.3 Getting familiar with the MA 53
Turn on the instrument with the power
switch
which is located at the right side
of the MA 53. The device performs its
initial test and autocalibration. If an error
is detected the test is stopped and a
description of the error is shown on the
LCD-display
. In this case please contact
your local dealer or service.
If the
s above the
receiver selectors
and
and the signal
selectors
and
are lighted. The
frequency is set to 1 kHz and the level to
30 dBHL for the left channel,
-10 dBHL noise for the right. All these
settings are also shown on the display
(see picture 5).
The hearing level can be easily adjusted
independently for each channel with a
knob
and
↕ on each side of the
instrument. For optimal convenience
these level control knobs are usable from
the top or the side of the instrument.
They are detented in 5 dB steps
(adjustable to 2 dB or 1 dB). The signal
STIM bars
and
↔ are located beside
the level control knobs
,
↕. The signal
LEDs
and
light up when the signal is
presented. You can change from
presenter to interrupter function with the
STIM MODE button
. The corresponding
LED lights when the interrupter is
Picture 4 MA 53 power switch, display and
selection buttons for left and right channel
Picture 5 MA 53 display with initial settings
Picture 6 MA 53 level and frequency control
Содержание MA 53
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