HP 8340B Manual page 245

5-8.
YO LOOP ADJUSTMENTS
Reference
Performance Test: None
Service Section: Sweep Generator
-
YO
Loop
Description
The YO Loop Adjustment procedure adjusts the sampler drive circuitry
and the
IF gain.
The YO
Loop gain and phase margin adjustment selects the value of resistor A49R18 to place the YO
Loop gain and phase
within specified
limits.
This prevents the YO Loop from
oscillating while
still
providing sufficient gain in
the YO
Loop.
NOTE
The
YO
frequency adjustment in Paragraph 5-28 must be completed
before these adjustments are made.
SPECTRUM ANALYZER
Figure 5-18.
YO
Loop Adjustment Setup
HP 8340B/41B
Adjustments