TM 11-5820-765-34
The following voltage and resistance measurements show if diodes, meters, and controlled rec-
tifiers
are
defective
CAPACITORS CARRY A CHARGE AFTER POWER SUPPLY IS SHUT OFF
BEFORE PERFORMING TESTS:
SHUT OFF POWER SUPPLY.
DISCONNECT FROM AC POWER SOURCE.
DISCHARGE
CAPACITORS
BY
SHORTING
OUT
WITH
SHORTING
ROD.
Diodes
Measure:
Internal
resistance,
both
directions.
Multimeter
select
switch:
RX1
Procedure:
Remove panel(s).
Disconnect diode being tested by removing screws and leads.
Connect multimeter leads to ends of diode; take reading.
Reverse leads on diode; take reading.
Diode defective if reading shows:
Reverse resistance less than 500 ohms.
O ohms, both directions.
Reconnect
Replace
panel(s).
Meter M1
Function:
50-volt,
1000-ohm-per-volt
meter.
Test
equipment:
AN/USM-98A
Procedure:
Open front panel for both tests.