TM 11-6625-3081-23
2-8. TEST CONSOLE TEST BENCH 2A2 CONTROLS AND INDICATORS (cont)
2-8
PROGRAMMABLE DIGITIZER 2A2A1 (cont)
Key
5
6
7
8
9
10
Control or Indicator
AC-GND-DC Switches
A-B Switch
GAIN Potentiometer
POLARITY Switch
BANDWIDTH Switch
RECORD LENGTH Switch
Function
Selects one of three input modes.
A C - ac component of signal is coupled to input while
dc component is blocked.
GND - input connectors are disconnected from amplifier
input.
DC - both ac and dc components of signal are coupled
to amplifier input.
Lighted button indicates selected input coupling mode.
Selects A or B input connector. When lit, B input is
selected.
Screwdriver adjustment varies amplifier gain over
narrow range to allow differences in gain between
mainframes.
Selects inverted or normal amplifier mode. When
inverted mode is selected.
a
lit,
Selects full amplifier bandwidth or reduced bandwidth of
20 megahertz.
When lit, reduced bandwidth is selected.
When pressed, record length for selected time base is set
with DECREMENT/INCREMENT buttons.
Lights when on. Dis-
plays record length for selected time base.
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