TM 55-4920-429-13
Table 2-1. Test Set Controls and Indicators
CONTROL/lNDICATOR
DESCRIPTION
MASTER POWER Group
115 VAC circuit breaker CB1
115 VAC MASTER POWER switch S1
115 VAC indicator DS1
ELAPSED TIME indicator (ETI) Ml
28 VDC circuit breaker CB2
+28 VDC MASTER POWER switch S2
28 VDC indicator DS2
28 VDC CYCLIC TRIM circuit breaker CB3
CYCLIC TRIM 28 VDC indicator DS3
MULTIMETER Group
METER SOURCE switch S18
VDC mode indicator DS4
VAC mode indicator DS5
K-OHMS mode indicator DS6
Digital display A1
Analog meter M2
2-4
Two switches, three circuit breakers, and three indicator lights used to
control and indicate status of input power.
5 ampere circuit breaker.
Protects 115 vac 400 Hz power circuits from overload.
Provides ON/OFF control of 115 vac 400 Hz power.
Indicator light.
Indicates when 115 vac power is applied to test set through S1.
Indicates total time, to 9,999 hours, that test set has been energized.
5-ampere circuit breaker.
Protects 28 vdc power circuits from overload.
Provides ON/OFF control of 28 vdc power.
Indicator light.
Indicates when 28 vdc power is applied to test set.
7.5-ampere circuit breaker.
Protects cyclic trim 28 vdc circuits (external to test set) from overload.
Indicator light.
Indicates when 28 vdc power is applied to test set through CB3.
Switch, rotary, 8-position.
Selects one of 7 sources for input to multimeter, plus meter OFF. Switch
positions are:
CONTINUITY. Connects meter as ohmmeter and connects meter to
CONTINUITY switches.
ACTUATOR DRIVE. Connects meter to actuator drive circuits and to
ACTUATOR DRIVE switches.
DISCRETE SIGNAL MONITOR. Connects meter to signal monitor
circuit.
GYRO TEST. Connects meter to gyro.
OFF. Disconnects meter.
ILCA DRIVE. Connects meter to integrated lower control actuator
drive circuits.
CPT MONITOR. Connects meter to control position transducer cir-
cuits.
SELF TEST. Connects meter to self-test (power supply) circuits.
Indicator light.
Comes on when meter is set to measure dc.
Indicator light.
Comes on when meter is set to measure ac.
Indicator light.
Comes on when meter is set to measure ohms (continuity).
Digital meter. Displays ohms, ac or dc volts. Provides a maximum read-
ing of ±1999 (three and one-half digits and sign.)
Provides analog equivalent of digital display A1.
