HP 8568B, Performance Tests And Adjustments Manual, Page: 170 / 313

3. Preliminary Display Adjustments (SN 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.
r u n n i n g
1
2 0 . 0
o f f s e t : 2 5 . 0 0 V
- 1 2 5 . 0 0 0 1 2 5 . 0 0 0 3 7 5 . 0 0 0
5 0 . 0
25.00 V
Figure 3-27. Composite X Deflection Waveform
17. Adjust HF GAIN, and for
minimum overshoot and minimum rise and fall times of the
composite X deflection waveform.
Note
Always adjust and in approximately equal
amounts. Do not adjust one to its minimum value and the other to its
maximum value.
18. Use the oscilloscope 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.
O V E R S H O O T
9 0 %
O V E R S H O O T
Figure 3-28.
Rise and Fall Times and Overshoot Adjustment Waveform
Adjustments