18
2.
Turn the Voltage Adjust to minimum.
3.
Set up a 1000:1 probe with and external volt meter has is shown on Figure 5-1.
4.
Turn On the HT-20KVPac unit.
5.
Press the Test button and turn up the Voltage Adjust to compare the front meter of the HT-
20KVPac unit vs. the external volt meter, tolerance most be +/-0.1KV full scale.
6.
If one value is out of the specified tolerances, the HT-20KVPac unit needs a voltage meter
re-calibration. Follow the Voltage Meter Re-Calibration procedure.
Figure 5-1.
Voltage Measurement with 1000:1 High Voltage Probe
Voltage Meter Re-Calibration
1.
Turn Off the HT-20KVPac unit.
2.
Set up a 1000:1 probe with the volt meter has is shown on Figure 5-1.
3.
Enter to
Calibration Mode
. See Entering Calibration Mode procedure.
4.
Select the top calibration voltage point by pressing the
Reset
button until V1 is shown on
the front display of the HT-20KVPac unit.
5.
Turn the Voltage Adjust on the front panel to minimum (counterclockwise). Press the
Test
button and a voltage number will be displayed on the front panel meter (16.00 for AC). Be
careful as the HT-20KVPac will be putting out voltage at this point.
6.
Turn the Voltage Adjust on the front panel clockwise until the output on the external
voltage meter equals the number showed on the front meter of the HT-20KVPac unit, then,
press the Test button to record the new top calibration voltage point in the internal memory.
The front display on the HT-20KVPac unit will show "V1" again.
7.
Select the bottom calibration voltage point by pressing the
Reset
button until V2 is shown
on the front display of the HT-20KVPac unit.
8.
Turn the Voltage Adjust on the front panel to minimum (counterclockwise). Press the
Test
button and a voltage number will be displayed on the front panel meter (01.00). Be careful
as the HT-20KVPac will be putting out voltage at this point.
9.
Turn the Voltage Adjust on the front panel clockwise until the output on the external
voltage meter equals the number showed on the front meter of the HT-20KVPac unit, then,
press the Test button to record the new bottom calibration voltage point in the internal
memory. The front display on the HT-20KVPac unit will show "V2" again.
