Operating Instructions MA 50
Geba_MA50_Fe_11a.doc 8 851 406/2 11/11
3.3.1 Using the keyboard of the MA 50
All main functions of the MA 50
are directly accessable by pressing
a single button.
Following is the description of the
functions of each button:
frequency up:
change to next higher frequency
frequency down:
change to next lower frequency
FM - modulation (warble
tone):
changes test signal from pure tone
to warble tone.
receiver selector:
changes the receiver from AC to
BC or INSERT (if option
assembled). The lighted LED above
shows the current selection.
pulse tone:
enables pulsing of pure tone or warble tone.
stim mode:
changes the signal presentation from presenter to interrupter mode.
tracking function:
enables the automatic tracking (see chapter 4.4 masking).
channel selector key:
selects the right or left test ear.
3.3.2 The display of the MA 50
The bright LED-Display of the MA 50 shows levels and frequency. The
display shows the individual levels for the left channel on the left and the
right channel on the right. The
frequency is displayed in the
middle. Also the position of the
dot in the middle indicates the
kind of measurement. If the dot position is left from the center HL test is
indicated. The dot in the center stands for UCL measurement and a dot right
from the middle is MCL measurement. The example picture 8 shows the
initial setting for AC threshold test. The right test channel is set to 30 dB
HL
,
the left masking channel is set to -10 dB
HL
narrow band noise for masking.
The test frequency is 1000 Hz and the test is a HL measurement (dot left
from the middle).
Picture 8 MA 50 display for pure tone HL-test
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