Voltage and Resistance Measurements - TM-11-6625-623-450035

TM 11-6625-623-45

4-5. Voltage and Resistance Measurements

a. Test Equipment and Materials.

(1) Multimeter ME26B/U (multimeter) or equivalent.

(2) Voltmeter, Electronic AN/USM98 (differential voltmeter) or equivalent.

(3) Power Supply PP351/U (variable dc voltage supply, 0 to 20 volts, 1 milliampere (ma)

maximum) or equivalent.

b. Test Connections and Conditions.

(1) Make test connections as specified in Test procedure column of c below and illustrated

in figure 41.

(2) Resistance checks are made with no power applied to the function test set.

Note: For parts location, refer to figures 2-1, 22, and 2-3.

c. Procedure.

Step

Control

setting

Test

procedure,

Performance

standard

No.

Test equipment

Equipment under test

Circuit should measure

a. FUNCTION

FUNCTION SELECTOR

Measure the resistance

600 ohms 120 with R3

switch:

switch: TGC

between J2-IF TRANS

at clockwise stop and

OVERIDE.

jack J9 and J2FREQ

OHMS.

100 ohms 20 at counter-

DIVIDER jack 11 with

b. R A N G E

clockwise stop.

switch:

TGC & CAPTURE

RX10.

RANGE R3 poten-

tiometer at clockwise

and counterclockwise

stop.

Circuit should measure

Measure the resistance be-

a. FUNCTION SELEC-

Same as step 1.

100 ohms 20.

tween J2-IF TRANS

TOR switch: TGC

jack J9 and GRND jack

OVERIDE.

J13.

b. TGC & CAPTURE

RANGE R3 potentio-

meter: clockwise

stop.

a. FUNCTION SELEC-

Measure the resistance be-

Circuit should measure

a. FUNCTION

10,000 ohms 1,500.

tween J3KC STAB

switch:

TOR switch: 70K-5

jack J8 and J2-FREQ

CAPTURE RANGE.

OHMS.

DIVIDER jack J11.

b. R A N G E

b. TGC & CAPTURE

switch:

RANGE R3 potentio-

meter: counter-

RX1K.

clockwise stop.

a. FUNCTION

Measure the resistance be-

Circuit should measure 470

a. FUNCTION SELEC-

tween J1-KC STAB jack

kilohms 70.

switch:

TOR switch: 70K3

OHMS,

J7 and J2-FREQ DI-

C A P T U R E RANGE.

b. RANGE

b. TGC & CAPTURE

VIDER jack J11.

switch:

RANGE R3 potentio-

RX100K.

meter: counter-

clockwise stop.

Circuit should measure

a. FUNCTION

a. FUNCTION SELEC-

Measure the resistance be-

switch:

0 ohm at clockwise stop

TOR switch: SET

tween CALIBRATE

and 50 ohms 10 at

OHMS.

LEVEL.

WITH 10.000V R4 jack

b. R A N G E

counterclockwise stop.

J13 with OFF-SET.

switch:

ADJUST R2 poten-

tiometer at clockwise

RX1.

and counterclockwise

stops.