HP 8340B Manual 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