HP 83522A Service Notes page 76

Model 83522A Adjustments
ADJUSTMENTS
5-20. ALC ADJUSTMENT (Cont'd)
Figure 5-1 8. ALC Adjustments Location
3. Attach jumper from A4TPll to ground. Connect DVM to A4TP5 (reference to ground).
Adjust A4R56 OFS 2 (offset 2) for 0.000V f 0.001V. Remove jumper.
4. Connect DVM low to A4TP15 (floating ground) and connect DVM high to A4TP12.
Adjust A4R59 OFS 3 (offset 3) for 0.002V f 0.001V.
5. Press 8350A front panel and ensure that the power is leveled (83522A
UNLEVELED light off). ~ o n n z c t DVM high to A4TP7 and DVM low to A4TP15
(floating ground). Adjust A4R67 OFS 4 (offset 4) for 0.000V
f
0.001V.
6. Set CW frequency to 50 MHz. Turn off power. Connect DVM to A4TP10 and
adjust A4R4 (BIAS) for 0.000V
+
0.001V.
TuA
on power.
7. .Turn instrument power OFF. Remove A4 asse
m the extender board
and reinsert A4 d into the instrument. Turn ON
power to instrument.
Connect power meter to 83522A RF OUTPUT.
for plug-in front panel reading of +O dBm at 50 MHz. Adjust A4R6 0 LO
for an RF OUTPUT power at the 83522A connector of +O dBm
f
0.1 dB.
for plug-in front panel reading of +9 dBm. Adjust A4R7 0 MD (mid
RF OUTPUT power at the 83522A connector of 4-9 dBm
f
0.1 dB.
10. Iterate steps 8 and 9 until both low and midpower ranges are calibrated.