HP 8559A Operation And Service Manual page 144

ADJUSTMENTS
5-24. STEP GAIN ADJUSTMENTS (Cont'd)
PROCEDURE:
Set spectrum analyzer controls as follows:
RESOLUTIONBW
INPUTATTEN
SWEEPTRIGGER
VIDEO FILTER
Connect equipment as shown in Figure 5-10. Connect signal generator tuned to 321.4 MHz with approxi-
mately 30 dBm output to one side of a 1 dB/step attenuator. Connect step attenuator output to AlOWl
-
through adapter. Tune signal generator frequency for peak amplitude on display.
Set step attenuator to 12 dB and REF LEVEL FINE to
division down from top graticule line.
Adjust A12R39 12 D until signal stops rising on display, then adjust A12R39 counterclockwise until
-
signal drops approximately one third to one half of a division.
Set signal generator level so signal is one division down from top graticule line on display.
Set step attenuator to 0 dB and REF LEVEL FINE to 0.
Adjust A12R35 0 D adjustment for a signal level one division from top graticule line.
Set step attenuator to 12 dB and REF LEVEL FINE to
(offset). If offset is greater than
Replace 1 dB/step attenuator with 10 dB/step attenuator set to 0 dB. Set REF LEVEL FINE control to 0.
Tune signal generator frequency for peak amplitude on the display (near 321.4 MHz).
Set signal generator level for a signal one division down from top graticule line. Set step attenuator to 10
dB and REF LEVEL dBm to - 10.
Adjust A12R6 10 D adjustment for signal level one division from top graticule line.
Set step attenuator to 20 dB and REF LEVEL dBm to - 20.
Adjust A12R21 20 D adjustment for signal level one division from top graticule line.
Set attenuator to 40 dB and REF LEVEL dBm to
ADJUSTMENTS
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30 mV, repeat steps 3 through 8 until DVM indication is within limits.
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12. Set signal generator level for a signal one
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12. DVM indication should be 700
-
MODEL 8559A
AUTO
MIN
30 mV