HP 8340B Manual page 249

5-8.
YO LOOP ADJUSTMENTS (Cont'd)
Figure 5-21.
YO
Loop
Gain at
A48J1
NOTE
If
Sweep Generator frequency
is
changed too quickly in Step
15,
drop
outs
will
occur on
the
Spectrum Analyzer display.
If
this happens, slowly
adjust the Sweep Generator frequency so that the IF response passes
over the drop
outs
and eliminates them.
16.
Slowly tune the Sweep Generator
using the
rotary knob while monitoring the display on the
Spectrum Analyzer. (Maximum
hold
may
be used on the Spectrum Analyzer to trace out the
IF
response as
the frequency
is
changed.) Verify that the IF frequency response falls within the limits
shown in
Figure
5-22.
If it
does not, select
new values for A48C22 and A48R22 to adjust the shape
of the
response
(particularly
in
the 20 to 30
MHz
region).
Readjust A48R1 IF GAIN control
if
necessary.
17.
Set the DUT's LINE
switch to STANDBY.
Disconnect
all test cables going to the DUT.
18.
Remove the jumper between A59TP4 and A59TP5.
19. Reinstall the
A48 cover and remove the cover
from the
A49 YO Phase Detector. Removal of the
A49 cover
will
require disassembly of the YO loop. After the cover
is
removed, reassemble the YO
loop. Ensure that all the
SMB
cables are connected
correctly.
HP 8340B/41B
Adjustments