18. Frequency Control Adjustments

A22

S T A R T

F M S P A N

Start-Up Time

Measnremtwt

Note

Slow Sweep Adjustment

Note

F R E O U E N C Y C O N T R O L

S T O P

T I L T

Y T O

-SD VT0

TlJNE R E F

R E F

F A S T

A22

Figure 3-71. Location of Frequency Control Adjustments

5. Connect DVM to A22TP13 and ground to A22TP12.

6. Adjust A22 TUNE REF A22R17 for DVM indication of -10.285 AO.001 V dc. See Figure 3-71 for location of adjustment.

7. Key in [CENTER FREQUENCY) 10 MHz, CFREQUENCY SPAN] 0 Hz, Trace A [CLEAR-WRITE),Sweep @‘i!i?Z], Scale LIN.

8. Key in Isv\IEEP TIME) Is, Marker I-1. Adjust marker to the left edge of the CRT. Key in (SHIFT) (ml “, then key in (SHIFT) C-1 F three times. CRT annotation should indicate SWEEP GEN measured sweep time.

1 second start-up time:

The start-up time measured in step 8 uses the [sHIFTl[BW)r function that displays a sweep time value which is 1% to 5% longer than the actual spectrum analyzer sweeptime. This error is compensated when using the shift F function to adjust the sweep times in the following procedure.

9.Key in Marker loFF) then [ml.

10.Key in [SHIFT) (BW] F three times and note the CRT annotation. The annotation should indicate SWEEP GEN measured sweep time of (1 .OO s + start-up time from step 8) +O.Ol s. To adjust sweep time, adjust A22R88 SLOW slightly, then key in (SHIFT) [REsBW) F and note new SWEEP GEN measured sweep time as indicated by CRT annotation. Repeat this process until the 1 s sweep time is within spec.

Adjusting A22R88 CW decreases the sweeptime.

3-120 Adjustments