HP 83522A Service Notes page 78

Model 83522A
ADJUSTMENTS
Adjustments
- - -
5-21. INTERNALLEVELED FLATNESS(Cont8d)
PROCEDURE:
NOTE
This procedure assumes that A3S1 is set t o the factory-set position (Table
5-6), and at the 8350A Sweep Oscillator, 27.8 kHz square wave modulation
is selected.
1. Reinstall the A5 FM Driver Assembly. Connect equipment as shown in Figure 5-19,
with the 8755C monitoring the RF output. Select 8350A
@#@B.
Sweep the full
range of the plug-in.
SWEEP RF
OSCILLATOR PLUG-IN
SWEPT
AMPLITUDE
ANALYZER
1111 8 1111
1181 1 1 1 B
ATTENUATOR DETECTOR
- 0
o
0.0
Figure 5-1 9. Internal Leveling Adjustment Setup
NOTE
The following step negates any flatness compensation by effectively
removing the ALC Flatness Adjustments from the leveling circuitry. This
step may be omitted if RF flatness approaches specified limits.
2. Adjust all breakpoint potentiometers fully clockwise against the stops: A5R34 "BPI",
A5R36 "BP2", A5R38 "BP3", and A5R40 "BP4" as shown in Figure 5-20. This effectively
removes the circuit from the leveling loop.