GENERAL SUPPORT TEST PROCEDURES
AN/USM-223/U indicates 115 volts ac.
b. Set the power supply POWER switch to ON.
This chapter contains the necessary information to
c. Set the knife switch to the closed position.
test the line and load regulation and ripple of the
d. Set the power supply VOLT ADJ coarse and fine
power supply. The information consists of test equip-
controls (fig. 2-2) to indicate 40 volts dc on the
AN/GSM-64. The power supply DC VOLTS mete
should indicate between 39.6 and 40.4 volts.
e. Adjust the power supply CUR MODE coarse and
6-2. Tools and Test Equipment Required
fine controls to indicate 4 amperes on the ME-452/U
The power supply DC AMPERES meter should in-
The tools and test equipment required for testing the
dicate between 3.6 and 4.4. amperes. The
PP-3940A/G at the general support maintenance level
AN/USM-265 should indicate less than 1 millivolt.
are listed in section III of the Maintenance Allocation
f. Adjust the CN-16A/U control until the
AN/USM-223 indicates 125 volts ac. The AN/GSM-64
6-3. Preliminary Setup Procedure
should indicate between 39.96 and 40.04 volts.
g. Adjust the CN-16A/U control until the
a. Set the power supply POWER switch to the off
AN/USM-223 indicates 105 volts ac. The AN/GSM-64
should still indicate between 39.96 and 40.04 volts
b. Connect the power supply ac powerline cord to
Set the power supply POWER switch to the off (down
the CN-16A/U. Set the CN-16A/U control fully coun-
h. Disconnect the AN/GSM-64, AN/USM-265
c. Connect the AN/GSM-64, AN/USM-265,
ME-452/U, knife switch, and DA-638/U from the
DA-638/U, AN/USM-223, knife switch, and
i. Connect a No. 18 AWG wire between terminals 4
links of the power supply are connected between
and 5 of the power supply.
terminals 1 and 2, 3 and 4, 5 and 6, 8 and 9, and 10
j. Set the power supply POWER switch to ON. The
power supply DC AMPERES meter should indicate be-
d. Connect the CN-16A/U line cord to a source of
tween 3.6 and 4.4 amperes.
115-volt ac power.
k. Set the power supply POWER switch to the of
e. Set the knife switch to the open position and
(down) position. Disconnect all equipment.
adjust the DA-638/U for a load of 10 ohms.
6-4. Voltage and Current Test
a. Adjust the CN-16A/U control until the