Internal Leveled Flatness - HP 83522A Service Notes

Adjustments
Model 83522A
ADJUSTMENTS
5-20. ALC ADJUSTMENT (Cont'd)
for plug-in front panel reading of +13 dBm. Adjust A4R2 0 HI (high
RF
OUTPUT power at the 83522A connector of +13 dBm
f
0.1 dB.
12. meter and monitor the RF output with the 8755
to sweep the full range of the plug-in. Select 8350A
iliy with the 875
Set power for front panel reading of +O
.
Press
~WWJ
13. Adjust A4R1 SLP (slope) for best overall flatness from 10 MHz to 2.4 GHz as observed
on the 8755C.
NOTE
The F M PC Board will be reinstalled in Paragraph 5-21.
5-21. INTERNAL LEVELED FLATNESS
NOTE
Complete adjustment of the leveling loop requires several procedures to be
performed in the order prescribed, from Paragraph 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: A5
DESCRIPTION:
Four parallel circuits on the A5 assembly provide adjustments for ALC flatness. BPI
through BP4 and SLl through SL4 determine the slope of the flatness compensation signal
input to the A4 ALC assembly. Breakpoint potentiometers (BPI-4) determine the frequency
at which the corresponding slope potentiometers (SL1-4) begin to affect power output
leveling.
EQUIPMENT:
Sweep Oscillator
.....................................................
HP 8350A
Swept Amplitude Analyzer.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HP 8755CIHP 182T
Detector.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HP 11664A
10 dB Attenuator
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HP 8491A Option 010