TM 11-6625-847-45
4-7. Test Set A2, Pulse Generator Assembly A1A1, Tests
a. Test Equipment and Materials.
(1) Generator, Signal AN/URM-127.
(2) Oscilloscope AN/USM-140(*).
(3) Tee Connector UG-274B/U.
(4) A test cable, fabricated as shown in figure 6-17 from materials listed in paragraph 4-2c.
b. Test Connections and Conditions. Connect the test equipment as shown in figure 6-17 to test pulse generator assembly A1A1. Pulse generator
assembly A1A1 is illustrated by figure 4-3.
c. Procedure.
Step
Control settings
No.
Test equipment
Equipment under test
Test procedure
Performance standard
1
AN/USM-140
Test set A2
a. Set the SERV SEL switch to
a. None.
POWER switch: ON
POWER switch: OFF
STBY, and set the POWER
INTENSITY control:
PA/RT switch: PA
switch on the test set to
Adjust for ease of
SERV SEL switch: OFF
ON. Set common
viewing.
KEY switch: OFF
module tray A1A2
FOCUS control: ad-
XMIT STATUS: OPR
POWER switch to 0N.
just for a sharp
ALC VOLTAGE INFO: max
clear display. Ad-
ccw OFF.
b. Connect the fabricated cable
b. None.
just other controls as
ALC VOLTAGE TUNE con-
to the connector of pulse
required.
trol: max ccw OFF
generator assembly A1A1
AN/URM-127
IF OSCILLATOR select switch: 4
from which a reading is to
POWER switch: ON
MC FREQ 10MC switch: 0
be taken (outputs 1, 2,
FREQ RANGE
MC FREQ 1MC switch: 0
or 3).
MULTIPLIER: X1
MC FREQ .1MC switch: 0
c. Connect the AN/USM-140(*)
c. None.
Dial: 500 cps
500 VDC LOAD switch: LOW
probe to the output of the
ATTENUATOR and
2400 VDC LOAD switch: 1
AN/URM-127. Verify the
OUTPJT CON-
Install common
presence of 500 cps at 2
TROL: Adjust as
module tray A1A2.
volts - (Check
required to maintain
to see that the test set is
2 volts.
being supplied +27 volts
dc from the PP-1451/G.)
PP-1451/G
d. Connect the AN/USM-140(*)
d. None.
Power switch: ON
probe to the output leads
of the fabricated cable con-
nected to A1J4, and adjust
the AN/USM-140(*) for
a single 1- ec positive
s
pulse.
e. Set A1R3 fully clockwise,
e. A positive pulse from less than
and adjust A1R4 from
1.0 ec to more than 1.2 ec
s
s
fully counterclockwise to
(A1R4 rotated clockwise).
fully clockwise
f. Adjust A1R3 from fully
f. A positive pulse of less than
counterclockwise to fully
0.35 volt increasing to
clockwise.
more than 5 volts as A1R3.
is rotated clockwise.
g. Connect the AN/USM-140(*)
g. None.
and the fabricated cable
to A1J3, and set A1R1
to fully clockwise.
h. Adjust the AN/USM-140(*)
h. None.
to display a single positive
pulse of approximately
140- ec duration.
s
i. Adjust A1R2 from fully
i A positive pulse from less
counterclockwise to fully
than 70 ec to greater
s
clockwise.
than 210 ec as A1R2 is
s
rotated clockwise.
j. Adjust A1R1, from fully
j. Amplitude varies from less
counterclockwise to fully
than 0.1 volt to more than
clockwise.
1.3 volts
k. Connect the AN/USM-140(*)
k. None.
and the fabricated lead to
A1J2, and adjust the AN/
USM-140(*) to display
an average single pulse
of 140 ec.
s
l. Set A1R1 to a fully clockwise
l. A negative pulse from less
position, and adjust A1R2
than 70 ec to more than
s
from fully counterclockwise
210 ec as A1R2 is rotated
s
to fully clockwise.
clockwise.
m. Adjust A1R1 fully counter-
m. The amplitude varies from
clockwise to fully clock-
less than 0.1 volt to more
wise.
than 0.8 volt
n. Turn the POWER switch
n. None.
on the test set and the
power switch on the PP-
1451/G to OFF.
4-9
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