TM 11-6625-2440-12
Control, indicator, or connector
Ref des
Function
TEST SET SCAN switch----------------------
2A1S1
Used with SCAN SELECT switch to select functions (1 thru 17) within
the test set for monitoring by ancillary test equipment.
SCAN SELECT switch ------------------------
2A1S2
Operates with TEST SET SCAN and PLATFORM SCAN switches to
select functions within the test set or platform under test for
monitoring by ancillary test equipment.
PLATFORM SCAN switch--------------------
2A1S3
Used with SCAN SELECT switch to select functions (1 thru 17) within
the platform under test for monitoring by ancillary test equipment.
SYNCHRO SELECT switch------------------
2A1S4
PITCH 1/PITCH 2: Selects platform pitch synchro signals and routes
them to decade synchro bridge for angular measurement.
ROLL 1/ROLL 2: Selects platform roll synchro signals and routes them
to decade synchro bridge for angular measurement.
TRUE HD: Selects azimuth signals from platform synchros and routes
them to decade synchro bridge for angular measurement.
MAG HD 1/2/3: With SIGNAL INPUT switch set to positions 1 through
6, selects simulated azimuth signals from platform magnetic heading
servos and routes them to decade synchro bridge for angular
measurement.
OFF: Disconnects platform synchro signals from decade synchro
bridge.
SIGNAL INPUT switch ------------------------
2A1S5
OFF: No connection.
Positions 1 through 6: Provides selection of six simulated magnetic
heading outputs to the platform.
Position 8: Initiates plus ∆Vx and minus ∆Vy velocity torque logic self-
test.
Position 9: Initiates minus ∆Vx and plus ∆Vy velocity torque logic self-
test.
Positions 7 and 10 through 17: Not used.
LEVEL AXIS thumbwheel switches --------
2A1S6
Used to select the local level axis earth rate correction frequency to be
applied to the platform stable element.
HEADING AXIS thumbwheel switches----
2A1S7
Used to select the local heading axis earth rate correction frequency to
be applied to the platform stable element.
HIGH GAIN switch -----------------------------
2A1S8
OPERATE: Routes platform Ax and Ay accelerometer signals to
recorder channels 1 and 2 respectively.
ZERO REF: Shorts the input of the recorder high-gai n channels to
ground.
PSD switch ---------------------------------------
2A1S9
OPERATE: Routes the platform azimuth synchro and decade synchro
bridge outputs to recorder channels 5 and 6 respectively.
ZERO REF: Shorts the input of the recorder phase-sensitive
demodulator channels to ground.
OPERATE: Routes the platform ∆Vx and ∆Vy ramp voltages to recorder
LOW GAIN switch ------------------------------
2AS10
channels 3 and 4 respectively.
------------------------------------------------------
ZERO REF: Shorts the inputs of the recorder low-gain channels.
LOW GAIN connector J10 -------------------
2A1J10
Provides output connection to record er low-gain channel.
PSD connector J9 ------------------------------
2A1J9
Provides output connection to recorder phase-sensitive demodulator.
HIGH GAIN connector J8 --------------------
2A1J8
Provides output connection to recorder high-gain channel.
115 VAC APH circuit breaker ---------------
2A1CB1
Controls application and provides overload protection for 115 vac, A-
phase power to platform.
26 VAC circuit breaker ------------------------
2A1CB4
Controls application and provides overload protection for 26 vac power
to platform azimuth, pitch, outer roll, and magnetic heading servo
synchros.
SE HEAT circuit breaker ----------------------
2A1CB3
Controls application and provides overload protection for 115 vac, C-
phase power to platform stable element heaters and reference
AMB HEAT circuit breaker -------------------
2A1CB2
Controls application and provides overload protection for 115 vac, C-
phase power to platform ambient heaters, reference transformer,
and blowers.
ELAPSED TIME meter ------------------------
2A1M1
Indicates total time that electronics unit has been in operation.
Connector J6 ------------------------------------
2A1J6
Provides power and control signal output connect ion to platform and
provides platform test signal input connection to test set.
Connector J7 ------------------------------------
2A1J7
Provides platform test signal input to test set.
COUNTER connector J1 ---------------------
2A1J1
Provides test output connection to counter.
VM connector J2 --------------------------------
2A1J2
Provides test output connection to differential voltmeter.
SYNC BRDG connector J3 ------------------
2A1J3
Provides test output connection to decade synchro bridge.
PH ANGLE VM connector J4 ----------------
2A1J4
Provides test output connection to phase angle voltmeter.
SCOPE connector J5 --------------------------
2A1J5
Provides test output connection to oscilloscope.
3-5
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