HP 8568B manual Sample and Hold Balance Adjustments, Sample and Hold Balance Adjustment Waveforms

Sample and Hold Balance Adjustments

25.Digital Storage Display Adjustments

13.Set LINE switch to STANDBY.

14.Place A3A3 Line Generator on extender boards.

15.Set LINE switch to ON. Press QNSTR PRESET].

16.Key in C-1 0 ’ (RECORDER LOWER LEFT) 0 [Hz). Press [SHIFT] 0 1 (RECORDER UPPER RIGHT) 1028 a.

17.Connect oscilloscope to A3A3TP4.

18.Connect A3A3TPll to oscilloscope External Trigger Input and adjust oscilloscope controls for display as shown in Figure 3-91.

19.Adjust A3A2R50 X S&H BAL for minimum de 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 rnV/dlV

ioffset: 0 . 0 0 0 V

: 10.00 : I dC

~4*..,..600 ..ns

-2:‘9000d us 2 . 1 0 0 0 0 us

5 0 0 ns/div

4 f300.5rnV

Figure 3-91. Sample and Hold Balance Adjustment Waveforms

1 5 0 . 0 mV/dlv #offset: 0 . 0 0 0 v i 10.00 : 1 dc

; .A. ,,

:,,

-2 . 9 0 0 0 0 us

.....	./ ..i ..:. i.. :...;.. /	.	./	i	‘
	.+
	.:.
	.+
	..i	,,,,,,,,	.,,, .,	i
- 4 0 0 . 0 0 0 ns			2 . 1 0 0 0 0 us
5 0	0 ns/dlv

4 f300.5BV

Figure 3-92. Waveform Before Adjustment

Adjustments 3-147