Condenser Test Circuits-continued

TM 9-4910-736-14&P

Connect TEST LEADS and oscilloscope across 0.1 uF test

(5)

capacitor.

(6)

Adjust trimmer potentiometer R72 (figure FO-2) for 450 mV p-p

indication on oscilloscope. Note the frequency of the signal.

Connect oscilloscope to junction of R99 and CR21 (E5) and

(7)

ground.

(8)

Adjust trimer potentiometer R67 for a clean sine wave twice the

frequency displayed in step (6) with an amplitude of approximately

150 mV p-p.

Disconnect the oscilloscope.

(9)

Connect the TEST LEADS together.

(10)

(11)

Verify that ZERO ADJ OHM AND SERIES RES control is at 12 o'clock

position and then adjust trimmer potentiometer R55 (figure FO-2)

for a full-scale deflection (30 KV black scale).

(12)

Connect TEST LEADS across 0.1 uF test capacitor.

(13)

Adjust trimmer potentiometer R68 for 30 KV indication on the

black scale.

(14)

Repeat steps (10) through (13) until meter indicates 30 KV

whether the TEST LEADS are shorted together or connected across

the 0.1 uF test capacitor.

(15)

Connect the TEST LEADS to 0.3 ohm test resistor.

(16)

Adjust trimmer potentiometer R83 (figure FO-2) until meter

indicates 27 KV.

(17)

Connect the TEST LEADS together.

(18)

Adjust trimmer potentiometer R55 for 30 KV indication.

(19)

Connect the TEST LEADS to 0.3 ohm test resistor.

(20)

Adjust trimmer potentiometer R83 (figure FO-2) for 27 KV indication.

(21)

Repeat steps (14) through (17) until meter indicates 30 KV with

TEST LEADS shorted and 27 KV when connected across 0.3 ohm test

resistor.

(22)

Connect the TEST LEADS across the 0.1 uF test capacitor wired in

series with 0.3 ohm test resistor. Meter indication should be

26.5 to 27.5 KV.

Connect the TEST LEADS across 0.5 uF test capacitor wired in

(23)

series with 0.3 ohm test resistor. Meter should indicate 26.5 to

27.5 KV.

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