Protection Circuit

TM 9-4910-736-14&P

(4) Connect TEST LEADS together and set meter to zero ohms using

ZERO ADJ OHM AND SERIES RES control.

(5) Disconnect the TEST LEADS.

(6) Allow at least 2 minutes for temperature stabilization. PILOT

light should be on.

Protection Circuit.

Proceed as follows:

(1)

Set FUNCTION switch to OFF.

(2)

Connect BAT LEADS through a 0.5 A meter to the power supply

as follows: red +12 V lead to positive and the other lead to

negative terminal.

Set FUNCTION switch to OHM. If the PUSH TO RESET window is red,

(3)

depress it to reset the circuit breaker.

(4)

Set the power supply to 16.6 v dc. The PILOT light should be

off and the test set meter should indicate exactly zero.

Set trimmer potentiometer R1 (see figure FO-2 for location) to extreme

(5)

clockwise position. Depress the PUSH TO RESET button. The PILOT

light should be on and the ammeter should indicate 170 to 270 mA.

(6)

Slowly rotate potentiometer R1 until the PILOT light goes off.

Set the power supply to 16.4 v dc.

(7)

(8)

Reset the circuit breaker by depressing the PUSH TO RESET button.

The PILOT light should go on.

Set the power supply to 32 V dc. The ammeter should indicate

(9)

zero.

(10)

Set the power supply to 12 V dc.

(11)

Reverse the BAT LEADS connections.

(12)

Reset the circuit breaker by depressing PUSH TO RESET button. The

ammeter should indicate zero.

(13)

Remove the ammeter and restore the proper BAT LEADS connections.

The PILOT light should be on.

c. Condenser Leakage Test Circuits. Proceed as follows:

(1)

Set test set FUNCTION switch to OFF and if not already done,

connect BAT LEADS to 12 V dc supply.

(2)

Connect TEST LEADS to test fixture number 403-TF-01.

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