HP 8568B, Performance Tests And Adjustments Manual, Page: 156 / 313

2. High-Voltage Adjustment (SN and Above)
11. Remove the protective cover from the High-Voltage
Regulator Assembly. A label should be visible on the
High Voltage Assembly. is mounted 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.
V dc
Warning
With power supplied to the instrument, is at a voltage
level of approximately -2400 V dc. Be extremely careful.
12. Connect the high-voltage probe to See Figure 3-14 for
the location of the test point.
L A B E L
Figure 3-14. 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 regulator circuits to
stabilize.
15. Adjust HV ADJ for a DVM indication equal to the
calibration factor (calculated in step 8) times the voltage labeled
on the top of the
High-Voltage Assembly (noted in step
11). See Figure 3-13 for the location of the adjustment.
V dc
E
X A M P L E
:
If the calibration factor calculated in step 8 is 0.00099, and
is labeled for -2400 V, then adjust HV ADJ
for a DVM indication of:
0.00099 x (-2400 V) = -2.376 V dc
3-42 Adjustments