
18. RF Module Phase Lock Adjustments
Sampler
Output
2 1. Use a BNC to SMB snap-on test cable to connect the oscilloscope
Balance
Adjustment
Channel 1 input to the RF Section A6A9J4 VCO TUNE connector.
22. On the oscilloscope, key in
(j%ZiLQ
[?KK)
to perform a soft
reset.
23. Set the oscilloscope controls as follows:
Press
m):
Channel 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . on
amplitude scale
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
lO.OV/div
offset
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -1O.OOOOV
coupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..dc
Press
(TlME):
time scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..l
msec/div
reference
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..left
Press (TRIG):
EDGE TRIGGER . . . . . . . . . . . . . . . . . . . . . . . . . auto, edge
source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..l
level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
-
lO.OOOOV, rising edge
Press
(5iZKYj:
connect dots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..on
24. On the oscilloscope press
(SHOW).
The VCO TUNE waveform
displayed on the oscilloscope should be similar to Figure 3-83.
Use the oscilloscope
(aTav]
markers to measure the waveform
maximum and minimum voltages, and the dead time between
consecutive voltage ramps.
hp
running
5.00
V/div
l.OOOrl
dc
0.00000 s
5.00000
IS
10.0000
IS
1.00
ns/div
Vmarker2Cl
)
3.75000 v stop marker:
6.840001s
VnarkerlC
1)
-24.5313 V
start marker:
3.34000ns
delta
V(
1
)
28.2813 V
delta
t:
3.50000ms
l/delta
tr
285.714
h
1 f-IO.00 v
Figure 3-83. A Sampler Balance Adjustment Waveform
3-l 64 Adjustments
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