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Page Title:
Table 7-4. Divider Circuits Measurements |
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 TM 11-6625-542-14-1
oscilloscope to MARKER OUT of AN/USM-108A.
7-7. Divider Circuits Measurements
(2) Connect lead from TRIGGER OUT of
a. Test Equipment and Materials Required.
AN/USM-108A to oscilloscope trigger input.
Oscilloscope AN/USM-281A
b. Test Connections and Conditions.
(1)
Connect probe from input A
of
Table 7-4. Divider Circuits Measurements
Control Settings
Step No.
Test equipment
Equipment under test
Test procedure
Performance standard
a. Stable waveform.
Vernier
POWER: ON1
a. Adjust trigger level control
sensitivity: .1,
MICROSECONDS:
on oscilloscope for stable
calibrated. Horiz.
depressed.
trace.
sweep: internal,
X5. Sweep
b. Depress pushbuttons on
b. As shown in table 6-1
time: 1 p.s Sweep
All other pushbuttons
mode: normal.
ejected.
AN/ USM-108A as indicated
NOTE. Table 6-1 consists of
Trigger slope: +.
in table6-1 in the prescribed
5 columns. Column 1 gives
Trigger source:
sequence.
proper oscilloscope settings.
external.
Columns 2 and 3 give the
correct settings for the
AN/USM-108A. Column 4
lists the adjustment control for
circuit being tested. Column
5 illustrates the correct
waveform displayed on the
oscilloscope.
MARKER OUT connector of AN/USM-108A.
7-8. Sine Wave Output Circuits Measurements
(2) Insert probe tip into termination connector
a. Test Equipment and Materials Required.
and connect probe lead to A input of oscilloscope.
(1) Oscilloscope AN/USM-281A.
(3) Connect TRIGGER OUT of AN/USM-108A
(2) 53-ohm termination connector.
to oscilloscope trigger input.
b.
Test Connections and Conditions.
(1) Connect 53-ohm termination connector to
Table 7-5. Sine Wave Output Circuits Measurements
Control Settings
Step No.
Test equipment
Equipment under test
Test procedure
Performance standard
1
Vernier
POWER: ON. 5 MC
Observe oscilloscope
Waveform displayed on
sensitivity: 0.1.
SINE WAVE:
oscilloscope should be one
Horizontal sweep:
depressed. All other
cycle per centimeter with an
internal, X5.
pushbuttons ejected.-
amplitude of two volts or
Sweep time: 1
more.
p.s. Sweep
mode: normal.
Trigger source:
external
2
Same as 1
10 MC SINE WAVE:
Observe oscilloscope
Waveform displayed should
except sweep
depressed. All other
be one cycle per centimeter.
time: 1 p.s.
pushbuttons ejected.
3
Same as 2
50 MC SINE WAVE:
Observe oscilloscope
Waveform displayed should
depressed. All other
be one cycle per centimeter
pushbuttons ejected.
with an amplitude of
approximately 1.2 centimeters
or greater.
7-3
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