HP 8568B Figure, Figure 3-27.Composite X Deflection Waveform, Rise and Fall Times and Overshoot Adjustment Waveform

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.

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:

.I

..:..

:::. .:. ::.:::::.::.:::..

1 2 0 . 0 V/div o f f s e t : 2 5 . 0 0 V

~~~~:~...~I;::r~i~~~-:1.

.:

- 1 2 5 . 0 0 0 ns1 2 5 . 0 0 0 ns3 7 5 . 0 0 0 ns

5 0 . 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.

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

3.56 Adjustments