HP 8568B Manuel d'utilisateur Page 182

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5. Log Amplifier Adjustments
23. Decrease the frequency synthesizer’s output level 10
dB.
Press
CREFERENCE
LEVEL) 0 dBm, and adjust the frequency synthesizer’s
output level for a DVM indication of + 1.00
k.001
Vdc.
24. Verify that attenuator is set at 10
dB.
Decrease the frequency
synthesizer output level by 10
dB.
Press [REFERENCE LEVEL] -60
dB.
25. Adjust
A4A3R83
LGlO
for DVM indication of + 1.000 kO.010 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 Table 3-3 for range of values.
26. Decrease the frequency synthesizer output level by 10
dB.
27. Key in [REFERENCE
LEVEL_)
-70
dB.
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
A4A2R18.
Refer to
lkble
3-3 for range of values.
29. Press [INSTR PRESET] to reenable IF Step Gains.
3.66 Adjustments
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