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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
Voltage
Regu
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