3. Preliminary Display Adjustments (SN 3001A and Below)
the combined X deflection voltage applied to the CRT. Use the
oscilloscope front-panel knob to adjust waveform fl sensitivity for
approximately 8 vertical divisions.
hp
running
i
. .
..~...............~....
-125.000
ns
125.000
ns
375.000
rls
50.0
ns/div
1
f
25.00 v
Figure 3-20. Composite X Deflection Waveform
17. Adjust
AlA4R28
HF GAIN,
AlA4C10,
and
AlA4Cll
for minimum
overshoot and minimum rise and fall times of the composite
X-deflection waveform. See Figure 3-18 for the location of the
adjustments.
Note
Always adjust
AlA4ClO
and
AlA4Cll
in approximately equal
amounts. Do not adjust one to its minimum value and the other to its
maximum value.
18. Use the oscilloscope
m
markers to measure the risetime,
falltime, and percent overshoot of the composite
Xdefection
waveform. Rise and fall times should both be less than
approximately 65 ns between the 10% and 90% points on the
waveform. Overshoot should be less than 3% (approximately 0.25
divisions). See Figure 3-21.
3-52 Adjustments
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