HP 8341b - Page 431

5-16.
LEVELED
RF
OUTPUT
ADJUSTMENTS
Reference
Performance
Test:
Maximum
Leveled Output
Power
and
Accuracy
Service
Section:
RF
Section
Description
In
this
procedure,
the
RF
output
signal
is
checked
in
leveled
mode.
An
oscilloscope
and
detector
are
used
to adjust
the Step
Recovery
Diode
(SRD,
internal
to the
SYTM)
for
optimum
bias
and
to
eliminate
the
possible
occurrence
of
"squegging".
In
the
next
procedure,
the
ALC
loop
gain
in
each
band
is
adjusted
for
optimum
operation-
A
final
section
checks
the
RF
output
signal
with
a
Spectrum Analyzer
for
the
appearance
of
squegging
in
any
of
the
bands
and
allows
a
last
fine
adjustment
to
eliminate
any
squegging
that is
observed.
DIGITAL
VOLTMETER
OUT
Z-AXIS
BLANK/MKRS
^
A26TP3
(MOD
LVL)
A24TP12
(SRO)
STOP SWEEP f
IN/OUT
OSCILLOSCOPE
10:1
DIVIDER
PROBE
CHAN
A
|
CHAN
B
Figure
5-52.
Leveled
Power
SRD
Bias Adjustment Test
Setup
HP
8340B/41B
Adjustments