Table 3-1. Test Set Controls and Indicators Continued

TM 9-4931-363-14&P

Table 3-1. Test Set Controls and Indicators - Continued

Function

Ref des

Nomenclature

METER SELECT switch

Connects meter to circuit to be monitored

Programs test set circuits to provide input voltages

TEST SELECT switch

and output monitoring for units under test

Programs test set circuits to apply input voltages and

CARD swtich

output monitoring for circuit cards. Switches monitored

voltages for self-test

EIA/AMPL switch

Selects BIT voltage to be routed to buffer amplifier in

EIA. Selects monitored EIA and self-test voltages

Programs test set circuits to connect a buffer amplifier

LINKAGE switch

to each linkage resolver in sequence. Applies test voltage

during buffer amplifier test. Applies voltages to be

monitored for self-test

EIA BIT switch

Selects BIT voltage to be routed to EIA

Programs test set circuits to provide input voltages for

SYSTEM switch

testing helmet sight subassembly

Protects 115-volt, 60-Hz power circuit against overload

3 AMP 60 HZ fuse

Protects 115-volt, 400-Hz power circuit against overload

3 AMP 400 Hz fuse

Applies +28 volts dc to initiate BIT sequence. Also

Sll

FUNCTION INITIATE

applies to some self-test functions

switch

Applies +28 volts dc to retract the sight portion of the

SIGHT RETRACT switch

helmet sight assembly

Selects linkage resolver rotor output (R2 or R3) to be

RSLVR SELECT switch

monitored

Lights to indicate internal 28 vdc power supply is operating

DS18

POWER indicator

Selects 11 5-volt, 60-Hz power or 115-volt, 400-Hz power

POWER switch

for internal use

Provides voltages impressed on meter for display on scope

Jll

J11 test jack

to check amplitude and phase

Provides enable A and enable B voltages for display on scope

J12

J12 test jack

to check amplitude and phase during sequencer test

Provides time, in-phase, reference voltage for scope synch

J13

J 13 test jack

during circuit card tests

3-5