Location Of High Voltage Adjustments - HP 8566B Adjustment Manual

2. High-Voltage Adjustment (SN 3001A and Below)
be performed with the DVM manually set to the 100 V range (*OO.OOO
on the HP 3456A display).
Figure 3-6. Location of High Voltage Adjustments
4. Set the spectrum analyzer LINE switch to ON. Set the front-panel
INTENSITY control fully counterclockwise (CRT beam at cut-off)
to prevent possible damage to the CRT.
5. Note .the DVM indication at AlA7TP3.
6. Connect the high-voltage probe to the DVM. Connect the probe to
7. Note the DVM indication.
8. Divide the DVM indication in step 7 by the DVM indication in
step 5. This gives the calibration factor needed to compensate for
high-voltage probe error.
9. Disconnect the high-voltage probe from AlA7TP3. Set the
spectrum analyzer LINE switch to STANDBY. Remove the ac line
cord from both instrument sections.
The MAINS power-on indicator AlASDSl (red LED) should
be completely off before proceeding with this procedure. See
Figure 3-6. The indicator will remain lit for several seconds after
the ac line cord has been removed, and will go out slowly (the
light becomes dimmer until it is completely out).
With the protective cover removed in the following step, do not
place hands near the AlA High-Voltage assembly. High voltage
(approximately -4000 V dc) can be present even when the ac line
cord is disconnected.
V O L T A G E
R E G U L A T O R
DVM Indication:
DVM Indication:
Calibration Factor:
,
.
Adjustments 3-33