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Document #7650-0038 Rev A1. © Copyright 2019 Directed Energy, Inc. All rights reserved.
3. Before connecting the pulse generator to the PVX-4140 B, set up the pulse
generator output to deliver a +5 V ±1 V pulse into 50 Ω. Use a repetition rate of
approximately 500 Hz and a pulse width of 1 µs.
4. Ensure that both high voltage power supplies are OFF.
5. Connect the positive power supply to the rear panel SHV connector lHV
Input. Connect the negative power supply to the rear panel SHV connector labeled
-HV Input. For positive-only output pulses, ground the -HV Input. For negative-only
output pulses, ground the +HV Input.
6. Connect an appropriate load to the rear panel SHV output connector.
7. The output pulse can be displayed on an oscilloscope two ways. One is by
connecting an appropriate high voltage probe to the output load, utilizing an
appropriate attenuator if necessary. The second and easier way is to use the front
panel Voltage Monitor (set the scope input impedance to 1 M
Ω
). Please note that
the rise and fall times are from the launch point of the pulse and may differ slightly
from the ones displayed at the load.
8. Plug the power cord into the AC power input and turn on the rear panel Power
switch. The Power LED should illuminate, indicating that the PVX-4140 B is
operational. If this does not occur, unplug it from AC power and refer to the
Troubleshooting Section of this manual.
9. Connect a coaxial cable from the pulse generator to the Gate input.
10. NOTE: The PVX-4140 B powers up in a faulted condition. Once the pulse generator
is enabled, the fault clears within 5 seconds.
11. Enable the PVX-4140 B by pressing the Enable button.
12. Slowly increase the high voltage power supplies until the desired load voltage is
reached. The PVX-4140 B output pulses follow the width and repetition rate of the
Gate input signal.
13. If there is no output from the PVX-4140 B, or the output is severely distorted, turn
OFF the high voltage power supplies. Leave all connections (including the AC
power cord) in place for approximately five minutes to bleed off the stored energy.
Disconnect the AC power refer to the Troubleshooting Section of this manual.
