Quantcast Voltage and Resistance Measurements - TM-11-6625-623-450017

 

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Figure 3-14. Electronic control amplifier (ampl) module extender, parts location.
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TM-11-6625-623-45 Maintenance Kit Electronic Equipment MK-722/URC Manual
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Procedure. - TM-11-6625-623-450018
C2, TM 11-6625-623-45
4-5. Voltage and Resistance Measurements
a. Test Equipment and Materials.
(1) Multimeter ME-26B/U (multimeter) or equivalent.
(2) Voltmeter, Electronic AN/USM-98 (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
(2) Resistance checks are made with no power applied to the function test set.
Note: For parts location, refer to figures 2-1, 2-2, and 2-3.
c. Procedure.
Step
Control
setting
Performance
standard
No.
Test
equipment
Test
procedure
Equipment under test
Circuit should measure
1
FUNCTION SELECTOR
Measure the resistance
a. FUNCTION
600 ohms ±120 with R3
switch: TGC
switch:
between J2­IF TRANS
at clockwise stop and
OVERIDE.
OHMS.
jack J9 and J2­FREQ
100 ohms ±20 at counter-
DIVIDER jack 11 with
b. R A N G E
clockwise stop.
TGC & CAPTURE
switch:
RX10.
RANGE R3 poten-
tiometer at clockwise
and  counterclockwise
stop.
2
Circuit should measure
Measure the resistance be-
a. FUNCTION  SELEC-
Same as step 1.
100 ohms ±20.
tween J2­IF TRANS
TOR switch: TGC
jack J9 and GRND jack
OVERIDE,
b. TGC & CAPTURE
J13.
RANGE R3 potentio-
meter: clockwise
stop.
3
a. FUNCTION  SELEC-
Circuit should measure
Measure the resistance be-
a. FUNCTION
10,000 ohms ±1,500.
switch:
TOR switch: 70K­5
tween J3-KC STAB
OHMS.
jack J8 and J2­FREQ
CAPTURE  RANGE.
DIVIDER jack J11.
b. TGC & CAPTURE
b. R A N G E
switch:
RANGE R3 potentio-
meter: counter-
RX1K.
clockwise stop.
a. FUNCTION
4
Measure the resistance be-
Circuit should measure 470,000
a. FUNCTION  SELEC-
±70,000
ohms.
switch:
tween J1-KC STAB jack
TOR switch: 70 K-3
OHMS.
J7 and J2-FREQ DI-
CAPTURE  RANGE,
b. TGC & CAPTURE
VIDER jack J11.
b. R A N G E
switch:
RANGE R3 potentio-
RX100K.
meter: counter-
clockwise stop.
a. FUNCTION
5
a. FUNCTION  SELEC-
Measure the resistance be-
Circuit should measure
0 ohm at clockwise stop
switch :
TOR switch: SET
tween CALIBRATE
OHMS.
and 50 ohms ±10 at
LEVEL.
WITH 10.000V R4 jack
b. RANGE
counterclockwise  stop.
J13 with OFF-SET.
ADJUST R2 poten-
switch:
tiometer at clockwise
RX1.
and counterclockwise
stops.
11

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