HP 8566B Adjustment Manual page 212

5. Log Amplifier Adjustments
3-72 Adjustments
20. Adjust A4A2R61 ATTEN for DVM indication of + 1.000 fO.OOO1 V
dc. See Figure 3-34 for location of adjustment. If unable to adjust
of A4A2R62. (If A4A2R61 is fully clockwise, increase the value of
21. Repeat steps 17 through 20, until specifications of steps 18 and 20
are achieved without further adjustment. Because adjustments
needed.
22. Press the LIN pushbutton. DVM indication at A4AlTPl should be
+ 1.000 f0.020 V dc (+0.980 to + 1.020 V dc). If indication is
not within this range, repeat steps 14 through 21. If indication is
within this range, press
IF step gains.
23. Decrease the frequency synthesizer output level 10 dB. Press
( )
0 dBm, and adjust the frequency synthesizer
REFERENCE LEVEL
output level for a DVM indication of + 1.00 f.OO1 Vdc.
24. Verify that attenuator is set at 10 dB. Decrease the frequency
synthesizer output level by 10 dB. Press
25. Adjust A4A3R83 LGlO for DVM indication of + 1.000 fO.O1O V dc.
See Figure 3-34 location of adjustment. If unable to adjust LGlO
for proper indication, increase or decrease value of A4A3R54.
Refer to 'Iable 3-3 for range of values.
26. Decrease the frequency synthesizer output level by 10 dB.
(
27. Key in
REFERENCE LEVEL
28. Adjust A4A2R14 LG20 for DVM indication of + 1.000 fO.O1O
V dc. See Figure 3-34 for location of adjustment. If unable to
adjust LG20 for proper indication, increase or decrease value of
29. Press (2-22) to reenable the IF step gains.
ENTER
)
-70 dB.
)
-60 dB.
LEVEL