Table of Contents
Advertisement
18. Frequency Control Adjustments
Start-Up Time
Note
Slow Sweep
Adjustment
Note
F R E O U E N C Y C O N T R O L
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
Key in
7.
[
CENTER FREQUENCY
A
Sweep @'i!i?Z], Scale LIN.
[
-
),
CLEAR
WRITE
Key in Isv\
8.
TIME)
left
edge of the CRT. Key in (SHIFT) (ml ", then key in (SHIFT)
GEN measured sweep 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)
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.
10 MHz,
)
SPAN
1 second start-up time:
S T A R T
F M S P A N
S T O P
T I L T
Y T O
R E F
F A S T
0 Hz, Trace
]
Advertisement
Table of Contents
