HP 8568B Set, Press @iK]:, Press @iZZQ, Use the oscilloscope, Figure 3-22.5OV,, Signal, Adjust the spectrum analyzer’s, 28.Set the oscilloscope controls as follows:

3.Preliminary Display Adjustments (SN 3001A and Below)

28.Set the oscilloscope controls as follows:Press @iK]:

Channel 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . on amplitude scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6.25 V/div

Press @iZZQ.

29.Adjust AlA4R7 X POS and AlA5R7 Y POS to either extreme to position the CRT beam off-screen (to prevent possible damage to the CRT phosphor). If it is not sealed, adjust AlA2R5 INT GAIN fully clockwise.

30.Adjust the spectrum analyzer’s front-panel INTENSITY control for 50V peak-to-peak (8 divisions) as indicated on the oscilloscope. See Figure 3-22.

18 . 0 0 V/div offset: 4 5 . 0 0 v

10.00: I dc

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

5 0 . 0 ns/dlv

1 f 50.00 v

Figure 3-22. 5OV,, Signal

31.Adjust AlA2R22 HF GAIN and AIABCIO for minimum overshoot on rise and minimum rise and fall times of the pulse waveform.

32.Use the oscilloscope [ml 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 center potentiometers AlA4R7 X POSN and AlA5R7 Y POSN.

34.Disconnect the oscilloscope channel 1 probe from the spectrum analyzer. Remove the Display Adjustment PC board from the A3A2 slot, and reinstall the A3A2 Intensity Control Assembly. Replace the A3 Section cover and cables.

35.Perform Adjustment Procedure 4, Final Display Adjustment (SN 3001A and Below).

Adjustments 3-51