HP 8568B manual Level, Remove the protective cover from the AlA High-Voltage

2. High-Voltage Adjustment (SN 3001A and Below)

Warning	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.
	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 AlAST High-Voltage
	Transformer. Record the voltage listed on the label for use in step
	15.
Note
	If the label is missing, use the nominal value of -3790 V dc.

12.Connect the high-voltage probe to AlA3TP3. See Figure 3-7 for the location of the test point.

Warning	With power supplied to the instrument, AlA3TP3 is at a voltage
	level of approximately -4000 V dc. Be extremely careful.

AlA

H,gh V o l t a g e

R e g u lotor

Figure 3-7. Location of Label and Test Point

13.Reconnect ac line cords to both instrument sections. Set the 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.

V dc

EXAMPLE:

3 - 32 Adjustments