11
1.
Connect the Tester to a proper source of supply using the included 18 AWG power supply cord.
2.
Plug the Output and Return test leads in to the jacks on the front panel.
3.
Connect the ends of the test leads to an oscilloscope with a high-voltage probe. Note that the
RETURN
lead is referenced to the chassis of the MegaPulse tester.
4.
Turn the Tester on. Toggle the
POLARITY
switch if necessary so that the
NOR
indicator is lit.
5.
Note that the Voltage meter may indicate that some residual voltage is present on the main storage
capacitor, even when the tester is first turned ON. This is due to inherent charging of the internal
capacitors. Pressing the
TRIGGER
switch will discharge the capacitors (be sure not to touch the outputs
and return leads when pressing the trigger switch).
6.
Adjust the
VOLTAGE
using the voltage knob so that the front panel LED display is reading a voltage
that is suitable for the measuring instrument that is being used - preferably close to the maximum output
voltage of the MegaPulse tester.
7.
Press the
CHARGE
button and, when the desired voltage is reached, push the red
TRIGGER
button,
and view the resulting impulse waveform on the measuring instrument.
8.
Evaluate the voltage waveforms (peak, rise and duration) that you captured, they should be within the
tolerances mentioned in
. If the measured waveforms are out of tolerances, then additional
evaluation and/or repair of the MegaPulse tester is needed.
9.
Note that the peak amplitude of the measured output waveform is proportional to the voltage that is read
of the front panel of the MegaPulse, but it will not be the same amount, it will depend on the waveform
calibration and tolerances, therefore, it is important to measure the peak amplitude of the output
waveform and adjust the output of the MegaPulse accordingly.
10.
Repeat steps 5 through 9, except this time toggle the
POLARITY
switch so that the
REV
indicator is
lit. Note that the impulse waveform will now be a negative pulse, so it will probably be necessary to
adjust the measuring instrument to get a proper reading.
11.
Connect the Output and the Return test leads across an appropriate current shunt, so that the Output lead
is connected to one end of the current shunt, and the Return lead is connected to the other end of the
current shunt.
12.
Connect the measuring instrument across the current shunt, keeping in mind that the Return lead is
referenced to ground.
13.
Toggle the
POLARITY
switch if necessary so that the
NOR
indicator is lit.
14.
Press the
CHARGE
button and, when the desired voltage is reached, push the red
TRIGGER
button,
and view the resulting impulse waveform on the measuring instrument.
15.
Evaluate the current waveforms (peak, rise and duration) that you captured, they should be within the
tolerances mentioned in
. If the measured waveforms are out of tolerances, then additional
evaluation and/or repair of the MegaPulse tester is needed.
16.
Repeat steps 14 through 17, except this time toggle the
POLARITY
switch so that the
REV
indicator
is lit. Note that the impulse waveform will now be a negative pulse, so it will probably be necessary to
adjust the measuring instrument to get a proper reading.
17.
Turn the rear-panel power switch OFF.
If the waveforms are out of tolerances, service is required. Remove the Tester from service and contact the
manufacturer for servicing information.
