HP 8340B Manual page 299

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-A»IS
BLANK/MhRS
^
STOP SWEEP
f
IN/OUT
A26TP3
I MOD
L V
LI
A22TP3
(SRD BIAS)
I
Q
1=1 a 1=] a a a a
OSCILLOSCOPE
10
1
DIVIDER
PROBE CHAN A
|CHAN B
Figure 5-52. Leveled Power
SRD
Bias Adjustment Test Setup
HP
8340B/41B
Adjustments