Operating Instructions MA 53
Geba_MA53_e_13a.doc
10 851 430/3 11/11
selected. The frequency is changed with up
,
→ and down
,
buttons
for both channels together. The design of the MA 53 makes it easy to control
level, signal presentation and frequency with one hand.
3.3.1 Using the keyboard of the MA 53
All main functions of the MA 53 are
directly accessable by pressing a single
button. Not frequently used procedures
like the calibration of the speech source
or the level step selection are hidden as a
“second level function”. To select this
function just press the addressed button
more than two seconds. A user menu for
the customization of the MA 53 is
available for advanced users (see chapter
8).
Following is the description of the main
and
second level
functions of each
button:
left (blue) channel frequency up: change to next higher frequency
left (blue) channel frequency down: change to next lower frequency
left (blue) talk over microphone: switches on the talk over microphone
as long as the button is pressed. The level can be adjusted with the
knobs
or
↕. The actual value is displayed in dB
HL
at the lower center
of the LCD-display
.
left (blue) channel receiver selector: changes the receiver from AC to
BC or FF or INSERT (if option assembled). The lighted LED above shows
the current selection.
2nd level: selects test mode HL, UCL, MCL for selected receiver
FM - modulation (warble tone): changes test signal from pure tone to
warble tone.
2nd. Level: to enter the user menu press button during power on.
left (blue) channel signal selector: changes the test signal from pure
tone to tape/CD or microphone or noise or switches the channel off.
2nd. Level: Calibration of tape/CD or live voice microphone
pulse tone: enables pulsing of pure tone or warble tone.
2nd. Level: enter pulse tone menu: ABLB, DLI and SISI Test
stim mode: changes the signal presentation from presenter to
interrupter mode.
2nd. Level: enables interlock function. Pressing left
or right
↔ signal
presentation bar affects both channels.
Picture 7 MA 53 keyboard
Содержание MA 53
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