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2. High-Voltage Adjustment (SN 3004A and Above)
Warning
3-42 Adjustments
11. Remove the protective cover from the AlA High-Voltage
Regulator Assembly. A label should be visible on the
non-component side of the High-Voltage Regulator Assembly as
shown in Figure 3-14.) Record the voltage listed on the label for
use in step 15. In cases where more than one voltage is listed on
this label, record the value which is closest to -2400 Vdc.
With power supplied to the instrument, AlA3TP2A is at a voltage
level of approximately -2400 V dc. Be extremely careful.
12. Connect the high-voltage probe to AlA3TP2A. See Figure 3-14 for
the location of the test point.
Figure 3-14. Location of AlA 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 de regulator circuits to
stabilize.
15. Adjust AlA6R103 HV ADJ for a DVM indication equal to the
calibration factor (calculated in step 8) times the voltage labeled
on the top of the AlA3Al High-Voltage Assembly (noted in step
11). See Figure 3-13 for the location of the adjustment.
E
:
XAMPLE
If the calibration factor calculated in step 8 is 0.00099, and
for a DVM indication of:
0.00099 x (-2400 V) = -2.376 V dc
V dc
V dc
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