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 TM 11-6625-542-14-1
a. Connect a probe from oscilloscope input A to
(3) Connect lead from probe to A input of
MARKER OUT connector of AN/USM-108A.
oscilloscope.
b. Set up oscilloscope as follows:
(4) Connect TRIGGER OUT of AN/USM-
108A to oscilloscope trigger input.
(1) Polarity as required.
(5) Set up oscilloscope as follows:-
(2) Vernier sensitivity to 0.1.
(a) Polarity as required.
(3) Horizontal sweep to internal, X5.
(b) Vernier sensitivity to 0.1.
(4) Sweep time to 1 microsecond.
(c) Horizontal sweep to internal, X5.
(5) Sweep mode to normal.
(d) Sweep time to 1 microsecond.
(6) Trigger source of external.
(e) Sweep mode to normal.
(7) Trigger slope to +.
c. Connect TRIGGER OUT of AN/USM-108A to
(f) Trigger source to external.
oscilloscope trigger input.
(g) Trigger slope to +.
d. Allow sufficient time for warmup.
(6) Depress 5 MC SINE WAVE pushbutton
e.
Depress 1 MICROSECONDS pushbutton on
on AN/USM- 108A.
AN/USM-108A.
(7) Adjust capacitors C229 and C223 one-
f.
Adjust triggering level of oscilloscope for stable
cycle-per-centimeter, two volts peak-to-peak on
trace.
oscilloscope.
b. 10 MC Adjust.
g. Refer to table 6-1.
(1) Repeat a (1) through (4) above.
NOTE
(2) Depress 10 MC SINE WAVE pushbutton
on AN/USM-108A.
Column 1 indicates the position of the TIME/DIV
(3) Change TIME/DIV on oscilloscope to 0.1
control on the oscilloscope. Columns 2 and 3
microsecond.
indicate the pushbuttons that should be
(4) Adjust capacitors C233 and C239 for one-
depressed for the circuit under test. Column 4
cycle-per-centimeter, with maximum amplitude.
indicates the correct potentiometer to be
c. 50 MC Adjust.
adjusted for the circuit under test. Column 5
(1) Set oscilloscope as in 10 mc adjust, but
illustrates the correct waveform as displayed on
set magnifier to X5.
the oscilloscope.
h.
(2) Depress 50 MC SINE WAVE pushbutton
Proceed with all steps indicated in table 6-1.
on AN/USM-108A.
6-17.
Sine Wave Adjustments
(3) Adjust capacitors C243 and C247 for one-
a. 5 MC Adjust.
cycle-per-centimeter
with
an
amplitude
of
(1) Connect 53 ohm termination connector to
approximately 1.2 centimeters.
MARKER OUT connector of AN/USM-108A.
(2) Insert tip of probe into terminating resistor.
6-24
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