HP 8568B, Руководство по испытаниям и регулировке работы, Страница: 222 / 313

14. 249 MHz Phase Lock Oscillator Adjustments
Procedure
Place instrument on right side with IF-Display Section facing right
as shown in Figure 3-59.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
Key in 2 and adjust for + 13.0 fO.l V dc at 12.
13.
14.
adjustment.
Press 1 (RECALL 1) and adjust for V dc.
Repeat steps 12 and 13 until and need
no
further
Set LINE switch to ON and press
PRESET
].
Connect DVM to and ground to
Key in
[
CENTER FREQUENCY
)
17.6 MHz and
[
FREQUENCY SPAN
)
0 Hz
on HP
Adjust PLO for DVM indication between V dc and
V dc. See Figure 3-60 for location of adjustment.
2 4 9 M H z
P H A S E L O C K O S C I L L A T O R
Figure 3-60.
Location of 249 MHz Phase Lock Oscillator Adjustments
Key in
FREQUENCY
]
37.1
MHz.
DVM indication should be b 12.9 V dc and + 16.9 V dc. If
DVM indication is within the given range, disconnect DVM from
and proceed to step 18. Otherwise, key in 2, SET
LINE switch to STANDBY, and place 249 MHz PLO on extender
(with DVM still connected to
Set LINE switch to ON and key in 2 on HP
S p e c t r u m A n a l y z e r .
Adjust PLO for DVM indication of + 13.0 V dc.
Key in
[
CENTER FREQUENCY
)
17.6 MHz,
SPAN
]
0 Hz, and
1.
Adjust PLO for DVM indication of V dc.
slug should be near center of coil form when is
properly adjusted.)
Adjustments