HP 8568B Figure, Figure 3-20.Composite X Deflection Waveform, Rise and Fall Times and Overshoot Adjustment Waveform

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.

hp s t o p p e d D I S P L A Y

r e m o t e l i s t e n

:

- 1 2 5 . 0 0 0 “ s	1 2 5 . 0 0 0 ns	3 7 5 . 0 0 0 “S’
5	0 . 0 ns/div

Figure 3-20. Composite X Deflection Waveform

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.

O V E R S H O O T

O V E R S H O O T

Figure 3-2 1.

Rise and Fall Times and Overshoot Adjustment Waveform

Adjustments 3-49