TM 11-6625-2735-14-1
b. Position the 2 traces approximately 4 divisions
apart.
c. CHECK—That the traces alternate at all settings of
TIME/DIV except X-Y.
7. Check CHOP Mode Operation
a. Set VERT MODE to CHOP, set TIME/DIV to 1 set
CH 1 and CH 2 AC-GND-DC switches to GND and adjust A
TRIGGER LEVEL for a stable display.
b. CHECK—For complete blanking of switching tran-
sients between chopped segments.
c. CHECK—That the duration of 1 cycle is ap-
proximately 1 division,
8. Check Vertical Amplifier Bandwidth
a. Set VERT MODE to CH 1, set TIME/DIV to 0.5 ms
and set CH 1 and CH 2 AC-G ND-DC switches to DC.
NOTE
See test equipment required, Table 5-1, for selection
of sine-wave generator with a 200 megahertz output.
b. Connect the sine-wave generator output cable to a
10X BNC attenuator, to a 50-ohm termination, to CH 1
input.
c. Set the sine-wave generator for a 6 division display
of reference frequency. (It may be necessary to insert
more attenuation to reduce display amplitude.)
NOTE
If generator has no reference frequency setting, set
for 5 megahertz.
d. Without changing the generator output amplitude,
increase the output frequency until the display is reduced
to 4.2 divisions.
e. CHECK—For a generator frequency reading of 200
megahertz or more (–15°C to +40°C).
f. Set VERT MODE to CH 2 and move test signal setup
to CH 2 input.
g. CHECK—Repeat the bandwidth check procedure,
parts c, d and e.
5-8
9. Check Bandwidth Limit Operation
a. Set 100 OR 20 MHz BW control to 100.
NOTE
If may be necessary to change sine-wave
generators. See test equipment required, Table 5-1
for selection of generator with an output of
100 megahertz and below.
b. Set the sine-wave generator for a 6 division display
of reference frequency.
c. Without changing the generator output amplitude,
increase the output frequency until the display is reduced
to 4.2 divisions.
d. CHECK—For a generator reading of approximately
100 megahertz.
e. Set 100 OR 20 MHz BW control to 20.
f. Set the sine-wave generator for a 6 division display
of reference frequency.
g. Without changing the generator output amplitude,
increase the output frequency until the display is reduced
to 4.2 divisions.
h. CHECK—For a generator reading of approximately
20 megahertz.
i. Return 100 OR 20 MHz BW control to full bandwidth.
10. Check Cascaded Bandwidth
a. Set VERT MODE to CH 1.
b. Connect CH 2 VERT SIGNAL OUT (output connec-
tor on rear panel) through a 42-inch 50-ohrn BNC cable, to
a 50-ohm termination and connect to CH 1 input.
c. Set the sine-wave generator for a 6 division display
of reference frequency.
d. Without changing the generator output amplitude,
increase the output frequency until the display is reduced
to 4.2 divisions.
e.
f.
CHECK—For a reading of 50 megahertz or more.
Disconnect all test equipment.
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