Compliance West MegaPulse 2x10s-2.5, Instruction Manual

Page: 28 / 32

24
4. Grasp the top of the enclosure clamshell
and lift it off the front and rear panels.
5.
All calibration adjustments are now
accessible.
NOTE
With the power cord replaced, the
instrument is operational for
service.
WARNING
Dangerous voltages exist when
energized. Exercise extreme
care when working on an
energized circuit.
6.
To reassemble, reverse steps 1-5 above.
Cleaning
CAUTION
Do not use aromatic
hydrocarbons or chlorinated
solvents for cleaning. These
solutions will react with the
plastic materials used in the
instrument.
Clean the front panel and case with a mild
solution of detergent and a damp sponge. Clean
dust from the PWB with clean, dry, low pressure
(<20 psi).
Performance Test
The performance test evaluates the performance
of your instrument to ensure that the logic, lights
and high voltage sections are working properly.
This test is recommended for incoming
inspection, as a preventative maintenance check,
and to verify proper operation during the
calibration procedure. It is not necessary to
disassemble the instrument to conduct these
tests. If the instrument fails any part of the
performance test, repair is indicated.
Allow the instrument to stabilize and perform the
test at an ambient temperature of 23
°
C
±
5
°
C
(73
°
F
±
9
°
F).
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
optional 1000:1 voltage sense jack on the
front panel (if provided) or an appropriate
measuring instrument (typically 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 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 - preferably
close to the maximum output voltage of
the MegaPulse tester. Push the red
TRIGGER button, and view the resulting
impulse waveform on the measuring
instrument.
8. A copy of the actual voltage waveforms
(rise and duration) that were measured on
your instrument before shipping are
included at the end of this manual (figures
4 and 6). These waveforms are identified
by the serial number of your MegaPulse
tester in the upper left-hand corner of the
figure(s). Compare the impulse waveform
to these "as shipped" waveforms, as well
as the ideal waveforms (theoretical
calculated values) that are also included at
the end of this manual (figures 5 and 7). If
the measured waveform is significantly
different than the ideal waveform, then
additional evaluation and/or repair of the
MegaPulse tester is warranted.
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