COMPONENT TESTING

TM 11-5820-765-34

2-6. COMPONENT TESTING

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

SHORTING

OUT

WITH

SHORTING

ROD.

Diodes

Test equipment: Multimeter TS-352B/U

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:

Forward resistance more than 5000 ohms.

Reverse resistance less than 500 ohms.

O ohms, both directions.

Reconnect

diodes.

Replace

panel(s).

Meter M1

Function:

50-volt,

1000-ohm-per-volt

meter.

Test

equipment:

Multimeter TS-352B/U

Voltmeter

AN/USM-98A

Procedure:

Open front panel for both tests.

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