HP 8568B, Performance Tests And Adjustments Manual, Page: 223 / 313

15.
16.
17.
18.
19.
20.
14. 249 MHz Phase Lock Oscillator Adjustments
Set LINE switch to STANDBY. Adjust one-half turn
counterclockwise before placing 249 MHz PLO in HP
Spectrum Analyzer without extender. (Leave DVM connected to
Set LINE switch to ON and key in 1. DVM indication
should be between V dc and V
Press 2 (RECALL 2). DVM indication should be b 12.9 V
dc and + 16.9 V dc. Disconnect DVM from
Set LINE switch to STANDBY and place 249 MHz PLO on
extender.
Set LINE switch to ON, press
PRESET
),
and set the analyzer
as follows:
[
C E N T E R F R E Q U E N C Y
)
. . . . . . . . . . . . . . . . . . . . . . . .
16.5 MHz
FREQUENCY SPAN)
..................................................................
. . .
0 Hz
Disconnect cable from and connect cable 89 (gray/white) to
one branch of a tee. Using a short coaxial cable (see Note below),
connect the other branch of the tee back to
Connect the
stem of the tee to the HP Spectrum Analyzer RF INPUT.
Note
The short cable 9 (white) in the IF-Display Section to
can be disconnected and used for this adjustment. Be sure to
reconnect the cable 9 (white) when finished.
21. Press
on the HP Spectrum Analyzer and
key in
(
FREQUENCY SPAN
)
5 MHz,
[
CENTER FREQUENCY
)
1547 MHz,
SEARCH
)
and
22. On the HP Spectrum Analyzer, key in
[
SIGNAL TRACK
),
[
FREQUENCY SPAN
)
10 300 Hz,
[
REFERENCE LEVEL
)
-50 and 0
23. On the HP Spectrum Analyzer, turn
off [
SIGNAL TRACK
_]
and set
STEP SIZE
)
to 500 on the HP Spectrum
Analyzer. Press
[
CENTER FREQUENCY
),
then key.
24. Disconnect cable from the HP Spectrum Analyzer RF
INPUT and connect cable (from tee) to PRE AMP input of HP
Amplifier. Connect cable from PRE AMP output to the HP
Spectrum Analyzer RF INPUT.
25. Adjust
500 TRAP adjustments and to null
the 500 sideband displayed on the spectrum analyzer. The
500 sideband should be less than -90 See Figure 3-60
for location of adjustments.
26.
27.
Press 1 on HP Spectrum Analyzer. Set LINE switch
to STANDBY and place 249 MHz PLO in HP Spectrum
Analyzer without extender (leave tee connected).
Set LINE switch to ON and press 1. Verify that 500
remains less than -90 in amplitude.
28. Disconnect tee and reconnect cable 89 (gray/white) to 1.
Adjustments 09