HP 8559A Operation And Service Manual page 188

POWER SUPPLY CHECKS AND ADJUSTMENTS (SERIAL PREFIX 2236A) (Cont'd)
5-17.
6. Remove extender board and reinstall Frequency Control Assembly A7.
The two following voltage adjustments,
must be adjusted while analyzer is still cold (during first five minutes after
turn-on). If instrument has been operating longer than five minutes, turn off
mainframe and remove assemblies A8 and A9. Let assemblies A8 and A9
cool on bench for 15 minutes. Replace the two assemblies and proceed with
adjustment of A9R2 and A8R62 during the first five minutes after turn-on.
7. Connect digital voltmeter to A9TP6
+
of 10.000
8. Connect digital voltmeter to A8TP2 VO. Set H P 8559A controls as follows:
FREQUENCY BAND GHz
ALT IF
SWEEP TRIGGER
9. The voltage at A8TP2 will change (between two values) each time a sweep is triggered. l'kigger the sweep a
few times and select the sweep that yields the least negative VO voltage. Adjust A8R62 VO adjustment for
a voltmeter indication of - 2.00
ADJUSTMENTS
NOTE
+
+
+
ON (depressed)
ON (depressed)
SINGLE