Compliance West MegaPulse 2x10s-2.5, Instruction Manual

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15
shunt.
12. Connect the measuring instrument
across the current shunt, keeping in mind
that the Return lead is referenced to
ground.
13. Turn the Tester on. Toggle the
POLARITY switch if necessary so that
the NOR indicator is lit.
14. Push the yellow CHARGE button.
Verify the red TRIGGER indicator is
now lit.
15. Adjust 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. Push the red
TRIGGER button, and view the resulting
impulse waveform on the measuring
instrument.
16. Repeat steps 12 through 14, 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
make adjustments to the measuring
instrument to get a proper reading.
16. Adjust the VOLTAGE knob fully
counterclockwise, to the minimum
position. Turn the rear-panel power
switch OFF.
Testing
This section describes how the MegaPulse Tester
is used to conduct a test. The
test can be
stopped immediately at any time by turning OFF
the rear-panel power switch.
1.
Connect the Tester to a proper source of
supply using the included 18 AWG power
supply cord. Make sure that the front
panel
VOLTAGE adjust know is turned
fully counterclockwise.
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 the
equipment under test.
4. Connect the ends of the test leads to the
optional 1000:1 voltage sense jack on the
front panel (if provided). Alternatively,
connect an appropriate measuring
instrument (typically an oscilloscope with
a high-voltage probe) to the equipment
under test in order to monitor the results of
the impulse test. Note that the
RETURN
lead is referenced to the chassis of the
MegaPulse tester.
5. Turn the Tester on. Toggle the
POLARITY switch as needed so that the
NOR or REV indicator is lit.
6. 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 output
and return leads when pressing the trigger
switch).
7. Push the yellow CHARGE button.
Verify the red TRIGGER indicator is
now lit.
8. Adjust 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. Push the red
TRIGGER button, and view the resulting
impulse waveform on the measuring
instrument.
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 always be somewhat lower. This is
because the meter on the MegaPulse is
measuring the voltage on the main
impulse storage capacitor (C1 in Figure
1). This voltage will intentionally
dissipate to some extent before reaching
the output leads. Therefore, it is
important to measure the peak amplitude
of the output waveform, and adjust the
output of the MegaPulse accordingly.