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17. 16 MHz PLL Adjustment
Procedure
1. Press
m
to turn the spectrum analyzer off. Remove the spectrum analyzer cover and
fold out the A2 controller and A3 interface assemblies. Use a pc board prop to hold up
the A3 interface assembly, as shown in Figure 2-26.
2. Connect the equipment as shown if Figure 2-26. The ground lead of the
1O:l
probe
connects to
A2TP10,
and the probe tip connects to
A2TPlOl.
3. The 16 MHz PLL adjustment location is shown in Figure 2-27.
A2 CONTROLLER ASSEMBLY
,
/
/
,
,
/
,
/
/
/
/
a
Figure 2-27. 16 MHz PLL Adjustment Location
4. Press
luNE)
to turn the spectrum analyzer on. Wait until the spectrum analyzer power-on
adjustments have completed.
5. Set the microwave frequency counter as follows:
Sample rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fully counterclockwise
10 Hz-500 MHz/500 MHz-26.5 GHz switch . . . . . . . . . . . . . . 10 Hz-500 MHz
50 R/l
MO
switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.l
MR
6.
On the spectrum analyzer, press
(-1,
REAR PANEL , and 10 ?Bz EXT ,
7. Disconnect W22 (10 MHz frequency counter) from
A2J8.
The display will probably
appear distorted and error messages may appear. Ignore the error messages.
2-64 Adjustment Procedures