HP 8568B, Performance Tests And Adjustments Manual, Page: 172 / 313

3. Preliminary Display Adjustments (SN and Above)
29. Set the oscilloscope controls as follows:
Press
Channel 1 . . . . . . . . . . on
amplitude scale . . . . . . .
Press
30. Adjust the spectrum analyzer’s front-panel INTENSITY control for
peak-to-peak (8 divisions) as indicated on the oscilloscope.
See Figure 3-29.
r u n n i n g
- 1 2 5 . 0 0 0 1 2 5 . 0 0 0
5 0 . 0
50.00 v
Figure 3-29. Signal
31. Adjust HF GAIN and for minimum
overshoot on rise and minimum rise and fall times of the pulse
waveform.
32. Use the oscilloscope markers to measure the risetime,
falltime, and percent overshoot of the pulse waveform. Rise
and falltimes should be less than 50 ns and 90 ns respectively.
Overshoot on the rise should be less than 5% (approximately 0.4
divisions).
33. Set the spectrum analyzer’s LINE switch to STANDBY and
reconnect the cable to
34. Disconnect the oscilloscope channel 1 probe from the spectrum
analyzer. Remove the Display Adjustment PC board from the
slot, and reinstall the Intensity Control Assembly.
Replace the Section cover and cables.
35. Reconnect the black connector with three wires (8, 98, and 96) to
and set INT GAIN approximately two-thirds
clockwise.
36. Perform Adjustment Procedure 4 Final Display Adjustment (SN
and Above).
3-58 Adjustments