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3. Preliminary Display Adjustments (SN 3004A and Above)
the combined X deflection voltage applied to the CRT. Use the
oscilloscope’s front-panel knob to adjust waveform fl sensitivity
for approximately 8 vertical divisions.
hp
running
.I
:
1
20.0
V/div
offset: 25.00 V
~:~.
..:..
:::.
.:. ::.:::::.::.:::..
~~~..~I;::r~i~~~-:1.
.:
-125.000
ns
125.000
ns
375.000
ns
50.0
ns/dlv
1
f
25.00 V
Figure 3-27. Composite X Deflection Waveform
17. Adjust AlA2R217 HF GAIN, AlA2C204, and AlA2C209 for
minimum overshoot and minimum rise and fall times of the
composite X deflection waveform.
Note
Always adjust AlA2C204 and AlA2C209 in approximately equal
amounts. Do not adjust one to its minimum value and the other to its
maximum value.
18. Use the oscilloscope
Intnv]
markers to measure the risetime,
falltime, and percent overshoot of the composite X defection
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 3-28.
OVERSHOOT
90%
OVERSHOOT
Figure 3-28.
Rise and Fall Times and Overshoot Adjustment Waveform
3.56
Adjustments