HP 8568B, Performance Tests And Adjustments Manual, Page: 261 / 313

25. Digital Storage Display Adjustments
Sample and Hold
13. Set LINE switch to STANDBY.
Balance Adjustments
14. Place Line Generator on extender boards.
15. Set LINE switch to ON. Press
PRESET
].
16. Key in (RECORDER LOWER LEFT) 0 [Hz). Press
(RECORDER UPPER RIGHT) 1028
17. Connect oscilloscope to
18. Connect to oscilloscope External Trigger Input and
adjust oscilloscope controls for display as shown in Figure 3-91.
19. Adjust X S&H BAL for minimum offset between the
level of the signal inside the two pulses to the signal level outside
the two pulses. Figure 3-91 shows a properly adjusted waveform.
Figure 3-92 shows the waveform before adjustment. Refer to
Figure 3-90 for location of adjustment.
1
50.0
0 . 0 0 0 V
10.00
2 . 1 0 0 0 0
5 0 0
Figure 3-91. Sample and Hold Balance Adjustment Waveforms
1 5 0 . 0
0 . 0 0 0 v
10.00 1 dc
- 2 . 9 0 0 0 0 - 4 0 0 . 0 0 0
2 . 1 0 0 0 0
5 0 0
Figure 3-92. Waveform Before Adjustment
Adjustments