ADJUSTMENTS
5-20. ALC ADJUSTMENT (CHANGE
8)
(Cont'd)
3. Attach a jumper from A4TPll to ground. Connect the DVM to A4TP4 (reference to ground)
and adjust
A4R82 (OFS 2) for a DVM reading of 0.000
k
0.001 Vdc. Remove the jumper.
4. Connect the DVM between
A4TP12 and A4TP9 (floating ground). Adjust A4R78 (OFS 3)
for a DVM reading of 0.000
+
0.001 Vdc.
5. On the HP
8350A/B, press
[CW] 151
[O]
[MHz].
Turn OFF the HP 83522A RF power.
Connect the
DVM
to A4TP7 (ground to P1 pin 42) and adjust A4R14 (BIAS) for a DVM
reading of 0.000
+
0.001 Vdc. Turn ON the HP 83522A RF power.
6. Set the HP
8350AIB LINE power to OFF. Remove the A4 assembly from the extender board
and reinsert the A4 assembly directly into the instrument. Set the HP
8350A/B LINE power
to ON and press
[CW] [S] [O] [MHz].
Connect the Power Meter to the HP 83522A RF
OUTPUT.
7. Set the HP
83522A for a POWER reading of -2 dBm. Adjust A4R13 (0 LO) for an RF
output power at the HP
83522A connector of
-
2
+
0.1 dBm.
8. Set the HP 83522A for a POWER reading of
+
6 dBm. Adjust A4R9 (0 MD) for an RFoutput
power at the HP 83522A connector of
+
6
+
0.1 dBm.
9. Iterate between steps 7 and 8 until both low and midpower ranges are calibrated and no
readjustment is necessary.
10. Set the HP
83522A for a POWER reading of
+
13 dBm. Adjust A4R7 (0 HI) for an RF output
power at the HP
83522A connector of
+
13
+
0.1 dBm.
11. Disconnect the Power Meter and monitor the RF output with the HP 8756A Scalar Network
Analyzer. Press HP
8350A/B
[INSTR PRESET]
to sweep the full range of the plug-in. Press
HP
8350AIB
[Ln
MOD]
for compatibility with the HP 8756A. Set the HP 83522A for a
POWER reading of
0dBm. Press
[RF
BLANK] [SAVE] [I].
12. Adjust A4R1 (SLP) for best overall flatness from 10 MHz to 2.4 GHz as observed on the HP
8756A.
13. Reinstall the A5
FM
board assembly.
CHANGE
8
8-518-6
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