Location Of Label And Test Point - HP 8566B Adjustment Manual

2. High-Voltage Adjustment (SN 3001A and Below)
3-34 Adjustments
10. Wait at least one minute for capacitors to discharge to a safe
level.
11. Remove the protective cover from the AlA High-Voltage
Regulator. A label should be visible on the AlA3Tl High-Voltage
Transformer. Record the voltage listed on the label for use in step
15.
If the label is missing, use the nominal value of -3790 Vdc.
12. Connect the high-voltage probe to AlA3TP3. See Figure 3-7 for
the location of the test point.
With power supplied to the instrument, AlA3TP3 is at a voltage
level of approximately -4000 V dc. Be extremely careful.
Figure 3-7. Location of Label and Test Point
13. Reconnect ac line cords to both instrument sections. Set the
spectrum analyzer LINE switch to ON.
14. Wait approximately 30 seconds for the dc regulator circuits to
stabilize.
15. Adjust AlA6R32 HV ADJ for a DVM indication equal to the
calibration factor (calculated in step 8) times the voltage labeled
on the top of AlA High-Voltage Regulator (noted in step 11). See
Figure 3-6 for the location of the adjustment.
E :
XAMPLE
If the calibration factor calculated in step 8 is 0.00099, and
a DVM indication of:
0.00099 x (-3875 V) = -3.836 V dc
16. With the front-panel INTENSITY control fully counterclockwise,
wait approximately 30 minutes to allow the high-voltage supply to
H i g h V o l t a g e
R e g u lotor
L o b e I
H V T P
V dc