TM 11-6625-847-45
4-11. Synthesizer Test Tray A1A3, Amplifier Modules AR1 through AR5 Tests
The tests of amplifier modules AR1 through AR5 are the same for each module; however, the test results, step 2, for AR3 are different. To remove and replace
the modules for the individual bench testing, refer to paragraphs 3-49 and 3-51c.
a. Test Equipment and Materials.
(1) Generator, Signal AN/GRM-50.
(2) Voltmeter, Electronic AN/URM-145.
(3) Test set A2 20-volt dc supply.
(4) Tee Connector UG-274B/U.
(5) Two Connectors UG-88C/U and two Sealectro 5051 connectors.
(6) Two Connectors UG-1460/U.
b. Test Connectors and Conditions. Connect the test equipment, as shown in figure 6-21, to amplifier modules AR1 through AR5 (fig. 4-7) to be tested.
c. Procedure.
Step
Control settings
No.
Test equipment
Equipment under test
Test procedure
Performance standard
1
PP-1451/G
Test set A2
a.
Turn the PP-1451/G power
a. None.
NORMAL-CHARGE
POWER switch: OFF
switch to ON. Turn the
switch: NORMAL
Tray A1A3
test set POWER switch to
Power switch: OFF
Power switch: OFF
ON. Turn the FREQ
VOLTAGE ADJUST
MODULE SELECT switch:
STANDARD OUTPUT
control: Set for
10 and 1 KC
AMPL SWITCH to OFF.
27-volt dc on OUT-
POWER VAR-FINED switch:
Set tray A1A3 power switch
PUT VOLTAGE
FIXED
to ON. Turn the FREQ
meter
ADJ control: Midrange
STANDARD OUTPUT
AN/GRM-50
FREQ SFLECT:
VOLT ADJ control fully
RANGE switch:
10 KC control: 0
counterclockwise.
530KC-1800 KC
1 KC control: 0
b.
Connect the AN/URM-145
b. None.
FREQUENCY con-
100 KC control: 0
probe to the W1 cable
trol: 1000KC
10 & 1 KC SYNTH:
on the AN/GRM-50,
POWER switch: ON
SYNTH OUTPUTS AMPL
Adjust the AN/GRM-50
VERNIER ATTENU-
ON-OFF switch: OFF
for a 1,000-kc output at
ATOR switch:
SYNTH OUTPUTS VOLT
50 mv.
AN/URM-145
ADJ control: Midrange
c.
Disconnect the AN/URM-145
c. Not less than 45 mv.
Power switch: ON
OUTPUT AMPL ON-OFF
probe from the AN/GRM-
VOLTS switch: .1
switch: OFF
50 (cable W1), and con-
OUTPUT VOLT ADJ con-
nect it to the lead attached to
troI: Midrange
A1A3A1J3. Observe the
FREQ DIVIDER FREQ
voltage level on the AN/
SHIFT switch: OFF
URM-145.
FREQ STANDARD:
d.
Set the amplifier module
d Less than 40 mv.
OUTPUT AMPL ON-OFF
A1 FREQ STANDARD
switch (2): OFF
OUTPUT AMPL switch
OUTPUT VOLT ADJ con-
to ON. Record the reading
trol (2): Midrange
on AN/URM-145.
MC SYNTH section:
OUTPUT AMPL ON-OFF
switch: OFF
OUTPUT VOIT ADJ con-
trol: Midrange
e. Rotate the amplifier module
e. At least 100 mv.
A1 FREQ STANDARD
OUTPUT VOLT ADJ
control fully clockwise,
and observe the indication
an the AN/URM-145.
f. Repeat the procedures in a
f. None.
through e above with input
frequencies of 7.1, 10,
and 23.5 mc.
2
Same as step 1 above 1
Same as step 1 above.
a. Check to see that equipment
a. None.
except set the VOLTS
is set up, connected, and
switch on the AN/
turned on in the same
URM-145 to 1.
manner as in step 1 above.
b. Set the amplifier module A1
b. None.
FREQ STANDARD
OUTPUT AMPL switch to
OFF, and the amplifier
module A1 FREQ STAND-
ARD OUTPUT VOLT
ADJ control fully coun-
terclockwise.
c. Connect the AN/URM-145
c. None.
probe to cable W1 on the
AN/GRM-50, and adjust
the AN/GRM-50 for an
output of 1 mc at 560 100
mv. Record this reading.
d. Connect the AN/URM-145
d. Not less than 5 mv of the
probe to the lead attached
level recorded in c above.
to A1A3A1J3. Observe
and record the voltage
level on the AN/URM-
145.
e. Set the FREQ STANDARD
e. Less than 460 mv.
OUTPUT AMPL switch
to ON. Observe the indi-
cation an AN/URM-145.
f. Rotate the FREQ STANDARD
f. More than 660 mv.
OUTPUT VOLT ADJ con-
trol fully clockwise.
g. Turn the power switch on
the PP-1451/G to OFF,
and disconnect the test
equipment.
4-17
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