Compliance West MegaPulse Defib-5PF-002, Instruction Manual

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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).
Note that the peak amplitude of the measured output waveform is proportional to the voltage that
is read on 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. Therefore, it
is important to measure the peak amplitude of the output waveform, and adjust the output of the
MegaPulse accordingly.
Determination of Passing and Failing results can prove difficult. To obtain the most accurate
results, it is generally necessary to perform multiple impulse tests on a few different test samples
(that have adequate insulation to pass the impulse test). Take note of the impulse waveshape,
amplitude, and duration. Also note how much variance there is in the waveshape from test to test.
Also (if possible), perform impulse testing on some test samples that are known to have
inadequate (or damaged) insulation. Take note of the impulse waveshape, amplitude, and
duration, when an insulation breakdown occurs.