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18. Frequency Control Adjustments
A22
FREOUENCY CONTROL
START
FM SPAN
STOP
TILT
YTO
-SD
VT0
TlJNE
REF
REF
FAST
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.
Start-Up Time
Measnremtwt
8. Key in
Isv\
left
IEEP TIME)
Is,
Marker
I-1.
Adjust marker to the
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:
Note
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.
Slow Sweep
10. Key in [SHIFT)
(BW]
F
three times and note the CRT
Adjustment
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.
Note
Adjusting
A22R88
CW decreases the sweeptime.
3-120
Adjustments