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.

,,

 

 

.....

./ ..i ..:. i.. :...;.. /

.

./

i

‘

 

 

 

 

 

 

.+

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

.:.

 

 

 

 

 

 

 

 

 

 

.+

 

 

 

 

:

,,

 

 

 

 

..i

,,,,,,,,

.,,, .,

i

 

- 2 . 9 0 0 0 0 us

 

 

- 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