TM 9-4910-663-12
(g) Position DC VARIABLE VOLTS switch (S10, fig 2-2) to the ON
position.
(h) Increase DC VARIABLE POWER SUPPLY 0-32 VDC control (T5,
fig 2-4) slowly clockwise observing the dc voltage and operation of
the relay.
(i) DC VOLTMETER OUTPUT VOLTAGE RANGE switch (S12, fig 2-1)
may be re-positioned to obtain a lower range to yield greater accuracy
of applied dc volts.
(j) After completion of tests, decrease DC VARIABLE POWER
SUPPLY 0-32 VDC control (T5, fig 2-4) fully counterclockwise, and set
DC VARIABLE VOLTS switch (S10, fig 2-2) and circuit breaker switch
(CB1, fig 2-5) to the OFF position.
Relay Contacts Test.
j.
(1) A test indicator circuit capable of being used for visual
indication of relay contact closure is provided.
(2) This test circuit may be used in conjunction with the dc
variable voltage supply to perform complete relay/contactor testing.
(3) Operation of this relay contact test is as follows:
(a) Position all switches and controls in accordance with
(b) Connect the relay coil by use of test leads to DC VARIABLE
VOLTS OUTPUT binding posts (fig 2-2).
(c) Connect the relay contacts by use of test leads to RELAY
CONTACTS INPUT binding posts (fig 2-2).
CAUTION
To prevent damage to components being tested always
ascertain component characteristics as published by
component manufacturer prior to the application of
power.
(d) Verify that DC VARIABLE POWER SUPPLY 0-32 VDC control (T5,
fig 2-4) is fully counterclockwise.
(e) Position DC VOLTMETER OUTPUT VOLTAGE RANGE switch (S12,
(f) Position DC VOLTMETER OUTPUT VOLTAGE SELECT switch (S11)
to the VAR position.
(g) Open the high voltage compartment door (5, fig 4-3) and
position circuit breaker switch (CB1, fig 2-5) to the ON position.
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