BATTERY CHARGER FUNCTION-continued

TM 11-6625-2976-40

1-19. BATTERY CHARGER FUNCTION. (CONT)

This action produces an output of + 8 vdc regulated by zener diode CR3. +8 vdc from point El Is applied

to A of P2.

CR2 clips off the positive half of the input sine wave and passes the negative half to RC filter C2 and R2.

C2 charges during conduction of the negative part of the wave and discharges through R2 during the

clipping of the positive part of the wave.

This action produces an output of -8 vdc regulated by zener diode CR4. -8 vdc from point E2 is applied

to B of P2.

Resistors R3 and R4 are preset to cause their respective zener diodes to conduct and establish each

output at 9.2 vdc.

The battery charger is used to trickle-charge the two test set batteries simultaneously.

The battery charger output is applied to the test set at plug P2. P2 connects to test set jack J2.

CAUTION

Do not remove power from battery charger while connected to test set. Test set will

discharge through battery circuitry.

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