HP 8568B manual A4A4 Xtal Adjustments, Press Marker loFF. Key in CREsJ 30 kHz

8.21.4 MHz Bandwidth Filter Adjustments

10.Key in CRESBW_) 1 MHz, and ISPAN) 1 MHz.

11.Press MARKER CPEAK SEARCH], MARKER a.

12.Key in CREsBW) 100 kHz, [-SPAN) 200 kHz, and MARKER

[PEAK SEARCH).

13.Adjust A4A4R43 LC to align markers on display. MARKER A level should indicate 1.00 X. See Figure 3-41 for location of adjustment.

14.Repeat steps 10 through 13 until no further adjustment is necessary.

A4A4 XTAL Adjustments

15. Press MARKER loFF). Key in CREsJ 30 kHz and

[FREQUENCY SPAN] 100 kHz.

16.Press [REFERENCE LEVEL) and adjust DATA knob to set signal peak on screen two divisions from the top graticule line.

17.Connect crystal filter bypass networks between A4A4TPl and A4A4TP2 and between A4A4TP4 and A4A4TP5.

18.Adjust A4A4C20 CTR to center signal on center graticule line. Adjust A4A4C9 SYM for best symmetry of signal. See Figure 3-42 for location of adjustments. If unable to adjust SYM for satisfactory signal symmetry, increase or decrease value of A4A4ClO. Refer to Table 3-3 for range of values.

A4A4

B a n d w i d t h F i l t e r

A4A4

Figure 3-42.

Location of A4A4 21.4 MHz Crystal Filter Adjustments

19.Remove crystal filter bypass network from between A4A4TP4 and A4A4TP5.

20.Adjust A4A4C74 CTR to center signal on center graticule line. Adjust A4A4C39 SYM for best symmetry of signal. See Figure 3-42 for location of adjustments. If unable to adjust A4A4C39 SYM

for satisfactory signal symmetry, increase or decrease value of A4A4C38. Refer to Table 3-3 for range of values.

21.Remove crystal filter bypass network from between A4A4TPl and A4A4TP2.

Adjustments 3.79