HP 8340B Manual page 234

5-5.
20/30 LOOP PHASE LOCK, A36, ASS,
ASS,
A40, AND A43 (Cont'd)
11.
Set the LINE switch to
STANDBY. Reinstall
A41 (PLL2 Phase Detector). Disconnect the
Fre¬
quency Counter from
A40J3
and
reconnect the A39W1
cable to
A40J3
(.15
-
6
MHz OUT FOR AF
^.1MHz)
connector.
12.
Set
the LINE switch to
ON. Press
[INSTR PRESET].
13. Press
[CW]
then enter
[3] [0] [MHz]
to set the N2 oscillator to 150
MHz.
14.
Connect
the
DVM to A43TP5 (VCO TUNE)
located on the top cover of A43.
15.
Adjust A40R2 (150 MHz)
for
a
DVM
indication
of
+3.00
Vdc
±0.05
Vdc.
16.
Connect the DVM
to
A41TP7
(<f>
DET OUT)
on the top cover of
A41.
17.
Adjust
A43R9
(.3
MHz) for
a
DVM
indication of +3.50 Vdc
± 0.05 Vdc.
18. Press
[CW]
then enter [1] [9] [.] [9] [9] [9] [9] [9] [9] [MHz]
to set the N2 oscillator to 100
MHz.
19. Connect the
DVM
to
A43TP5 (VCO TUNE)
located on the top cover of A43.
20. Adjust A40R4
(100
MHz)
for
a
DVM
indication of
+15.00 Vdc
±0.05
Vdc.
21.
Connect the DVM to A41TP7
(4>
DET OUT)
located on the top cover of A41.
22. Adjust A43R41 (.2
MHz)for
a
DVM indication of 3.50 Vdc
±0.05 Vdc.
23. Repeat Steps
12 through 22
until no further adjustment is
required.
24.
Set the Spectrum Analyzer
as follows:
a.
Press [INSTR PRESET]
b.
Set CENTER FREQ
to
29.5
MHz
c.
Set SPAN
to
200 kHz
25. Connect
jumper between A59TP4 (DL1) and A59TP5
(±5V) to disable the UNLK indicator circuit.
26. Set the
DUT
as follows:
a.
Press
[INSTR PRESET]
b.
Press [START FREQ] then enter [2] [0] [MHz]
c.
Press [STOP FREQ] then enter [2] [0] [.] [5] [MHz]
d.
Press [SHIFT],
then
[XTAL]
(This stops the frequency
at end of the
sweep without
a retrace.)
e.
Press [SINGLE] Sweep
(pe ^&«J-(^
27. Disconnect the cable W39 from A36J1 (OUT 20-30 MHz)
and connect the Spectrum Analyzer (RF
INPUT) to A36J1 through an SMB
snap-on to BNC cable. Adjust A43R25
(0.5
MHz
AF)
to center
the signal
on the
Spectrum Analyzer screen.
28. Set the Spectrum Analyzer as follows:
a.
Set CENTER FREQ
to 25 MHz
b.
Set SPAN
to
500 kHz
5-30
Adjustments
HP 8340B/41B