TM 55-4920-428-13
4-43. Test Equipment Required. The following test equipment is required.
E Q U I P M E N
T
No. 1 Digital Multimeter
No. 2 Digital Multimeter
Autotransformer, Variable
Test Aid (Locally Fabricated)
SPECIFICATION
AC: 50mV to 150V, 0.5%
DC: 10mV to 50V, 0.1%
0-150 Vac, 1500W
13 Vac to 0-6 Vac in-phase or
Frequency Counter
Oscilloscope, Dual Trace
Resistor (2 ea)
out-of-phase (See fig. 4-1)
0.5 Hz to 1 KHz, 0.1%
0 to 10 MHz
1 us to 500 ms/div
5mV to 20V/div
2,000 ohms, 1 W, 0.1 %
4-44. Preliminary Setup. The following must be performed prior to testing.
a. Test the power supplies and DVM. (Ref para 4-40.)
b. Set the front panel controls and switches as follows:
CONTROL OR SWITCH
POSITION
Power switch
OFF
SYSTEM SELECT switch
SAS 1
BITE switch
-20V
EXTERNAL METER SELECT
VALVE
switches (both)
SQ WAVE controls (both)
MIN
LINK TEST switches (both)
VALVE
FUNCTION SELECT switches
CLSD LOOP
(both)
VALVE CONTROL (both)
NULL
c. Connect power cable 145GS278-4 to the POWER receptacle on the test set and to the auto-
transformer.
d. Connect the autotransformer to 115-volt 60 Hz ac. Set the autotransformer for an output of 115-
volts.
4-45. Lamp Circuit Test. This test ensures the lamp test circuit and indicator lamps function as re-
quired.
a. On the test set, set the power switch to ON. The POWER indicator shall come on. One lamp in
the upper or lower indicator in the SAS 1 and SAS 2 FEEDBACK SELECT, CYCLE MOTOR, and
SOLENOID SHUTOFF switches shall come on.
4-16
