Compliance West MegaPulse Capacitor A PF Series, Instruction Manual

Page: 16 / 19

12
Section 4
Initial Checkout Procedure
The following procedure will verify that the MegaPulse Capacitor series A PF tester is working
correctly. We recommend that this procedure be conducted periodically to ensure proper
operation of the tester. The following items are needed to conduct this procedure: A measuring
instrument to monitor the output waveform. Always ensure that the measuring instrument
(usually an oscilloscope with a high-voltage probe) is rated for the voltage involved, and that the
frequency response of the instrument and probe are capable of measuring the output waveform of
the MegaPulse Capacitor series A PF tester. A measuring instrument or probe with a low
frequency response will result in erroneous readings that could be mis-read.
CAUTION
High voltage generated by the MegaPulse tester is exposed during this test. A risk of
shock exists. Exercise care when using the MegaPulse tester.
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 knob is turned fully
counterclockwise.
2. Plug the Output and Return test leads into the jacks on the front panel.
3.
Select the desired capacitance load on the front panel.
3. Connect the ends of the test leads to a capacitor load of the range selected on the front panel
knob, plug your high voltage oscilloscope probe to the output leads as well. Note that the
RETURN lead is referenced to the chassis ground of the tester.
4. Turn the Tester on.
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 output and return leads when pressing the trigger switch).
6. Push the yellow CHARGE button. Verify the red TRIGGER indicator is now lit.
7. 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.
8. 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. This voltage will intentionally dissipate to some extent before
reaching the output leads.
9. Adjust the VOLTAGE knob fully counterclockwise, to the minimum position. Turn the
rear-panel power switch OFF.