Power Meter Leveling Calibration - HP 83522A Service Notes

Model 83522A
ADJUSTMENTS
Adjustments
5-23. POWER METER LEVELING CALIBRATION
NOTE
Complete adjustment of the leveling loop for Power Meter leveling requires
several procedures to be performed i n the order prescribed from Psragraph
5-20 through 5-24. Deviation from this routine may cause improper leveling
andlor flatness problems.
REFERENCE:
Performance Test: 8350A Paragraph 4-14.
Service Sheet: A4
DESCRIPTION:
Power Meter leveling gain potentiometer A4R9 (PM) calibrates loop gain to full-scale
deflection of the leveling meter.
EQUIPMENT:
Sweep Oscillator
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HP 8350A
Power Meter.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HP 432A
Thermistor Mount.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HP 478A
10 dB Attenuator..
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HP 8491A Option 010
PROCEDURE:
NOTE
If, during the following procedure, ALC loop oscillations occur, reduce loop
gain by adjusting A4R11 (Figure 5-26) counterclockwise. This adjustment
will be set i n the next procedure.
1.
ect equipment as shown in Figure 5-23. Ensure 8350A is off. Press
and select a frequency at midband.
SWEEP R F
OSCILLATOR PLUG-IN
POWER
METER
. ,
RF
-
INPUT
OUTPUT -
I
A T T E N UATOR THERMISTOR
M O U N T
I
Figure 5-23. Power Meter Leveling Calibration
5-33