19
10. Turn Off the HT-20KVPac tester.
11. Confirm the new voltage meter calibration performing again the Voltage Meter Verification
procedure, mentioned before.
Leakage Meter Verification
1.
Turn Off the HT-20KVPac unit.
2.
Connect the output of the HT-20KVPac through a 100 watt high voltage load resistor
(60k ) in series with an external current meter returning to the Return jack on the front
panel of the HT-20KVPac as is shown on figure 5-2.
3.
Turn the Voltage Adjust to minimum.
4.
Turn On the HT-20KVPac unit.
5.
Turn the Leakage Limit potentiometer to the maximum.
6.
Press the Test button and slowly turn up the voltage comparing the leakage current on front
meter with the external meter. Reading on the external meter should be +/- 0.1mA.
7.
If one value is out of the specified tolerances, the HT-20KVPac unit needs a leakage current
re-calibration. Follow the Leakage Current Re-Calibration procedure.
Figure 5-2.
Current Measurement with 100 W High Voltage Resistor.
Leakage Current Re-Calibration
1.
Turn Off the HT-20KVPac unit.
2.
Connect the output of the HT-20KVPac through a 100 watt high voltage load resistor
(60k
in series with an external current meter returning to the Return jack on the front
panel of the HT-20KVPac as is shown on figure 5-2.
3.
Enter to
Calibration Mode
. See Entering Calibration Mode procedure.
4.
Select the top calibration leakage point by pressing the
Reset
button until L1 is shown on
the front display of the HT-20KVPac unit.
5.
Turn the Voltage Adjust on the front panel to minimum. Press the
Test
button and a
leakage number will be displayed on the front panel meter ( 5.0). Be careful as the HT-
20KVPac will be putting out voltage at this point.
