
13. Sweep, DAC, and Main Coil Driver Adjustments
Procedure
1. Position the spectrum analyzer on its right side as shown in
Figure 3-56, with bottom cover removed. Remove RF Digital
Section cover over the Al2 through Al6 assemblies. Jumper
A12TP2
to
A12TP3
(Lock Indicator Disable).
SYNTHESIZED SWEEPER
:R
GA18
SPECTRW
ANALTZER
Figure 3-56. Sweep and DAC Adjustments Setup
2. Set the spectrum analyzer LINE switch to ON.
3. Key in
@iZTEiZGHz_),
[SWEEP TIME] 500 ms.
4. Connect the oscilloscope channel 1 probe to
A16TP3
(Scan Ramp).
Connect rear panel SWEEP + TUNE OUT to the oscilloscope
channel 2 input.
5. Set the oscilloscope controls as follows:
Press
(CHAN)
Channel 1
...................................................
.on
probe
......................................................
1O:l
amplitude scale
.........................................
.
V/div
offset
...................................................
..3.5 V
coupling
....................................................
..d c
Channel 2
......................................................
off
amplitude scale
....................................
500
mVldiv
offset
...................................................
..-1.2 5
coupling
....................................................
..d c
probe
.......................................................
.l:l
Press [TRIG)
EDGE TRIGGER
.....................................
auto, edge
source
.............................................
..Channel 2
level
.......................................
1.375
V,
rising edge
Press
(TIME)
time Scale
..........................................
..50ms/di
v
3-114 Adjustments
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