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3. Preliminary Display Adjustments (SN 3001A and Below)
16. Three waveforms should be displayed on the oscilloscope, as
shown in Figure 3-20. The lower composite waveform represents
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.
- 1 2 5 . 0 0 0 " s
17. Adjust AlA4R28 HF GAIN, AlA4Cl0, and AlA4Cll for minimum
overshoot and minimum rise and fall times of the composite X
deflection waveform.
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 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 3-2 1.
Rise and Fall Times and Overshoot Adjustment Waveform
r e m o t e l i s t e n
1 2 5 . 0 0 0 ns
5 0 . 0 ns/div
Figure 3-20. Composite X Deflection Waveform
O V E R S H O O T
Figure 3-2 1.
D I S P L A Y
3 7 5 . 0 0 0 "S'
O V E R S H O O T
Adjustments 3-49
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