HP 8568B 24. Track and Hold Adjustments, Figure 3-88.Location of Track and Hold Adjustments

24. Track and Hold Adjustments

A6

AS ~EOM4LR ES A6A9AlRll

C A L A D J

II

c29	RI1
TRIF ‘ L E R M A T C H	C A L O U T P U T	RlO

A6A9Al

Figure 3-88. Location of Track and Hold Adjustments

10.Key in m TRACE A [-HOLD]. b

11.Adjust A3A9R44 OFFS POS until MARKER A level indication as indicated by CRT annotation flickers back and forth between .OO and .lO dB.

12.Key in cm) TRACE A m d.

13.Adjust A3A9R36 OFS NEG until MARKER A level indication as indicated by CRT annotation flickers back and forth between .OO and . 10 dB.

14.Key in ISHIFT) TRACE A [m) e.

15.Remove short from between A3A9TPl and A3A9TP3 or remove the SMB short from A3A9Jl. Reconnect cable 7 (violet) to A4AlJl.

16.Connect the DVM to A4AlTP3. Connect DVM’s ground to the IF section’s casting.

17.Press [REFERENCE LEVEL] and adjust DATA knob and front-panel AMPTD CAL adjust for a DVM indication of +2.000 fO.OO1 V dc at A4AlTP3.

18.Disconnect DVM from instrument.

19.Key in Cm), TRACE A (CLEAR-WRITE],MARKER L-1, MARKER In], SWEEP [CONT).

20.Adjust A3A9R57 T/H GAIN for GAIN for MARKER A level indication as indicated by CRT annotation of 100 *O.l dB.

2 1. Key in @?i) TRACE A [MAX) b.

22.Adjust A3A9R39 GPOS for MARKER A level indication as indicated by CRT annotation of 100 fO.l dB.

23.Key in [SHIFT) TRACE A (VIEW) d.

Adjustments 3-143