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Critical Operational Warnings
Failure to follow these warnings can result in immediate and catastrophic failure of the Nanosecond
Pulser (NSP). Such failure results in characteristic internal damage, and is not covered by the EHT
warranty. If you have any questions regarding safe operation, please contact EHT for guidance prior to
such operation.
1. Never ground either high voltage output (applies to floating units only)
The NSP high voltage output is floating and must not be grounded either on its positive side, or its
negative side. Grounding either output, especially at high voltage, generates internal corona that
damages the NSP. Both direct and capacitive grounding must be avoided.
Connecting a probe and oscilloscope to the output, even a differential probe, is effectively grounding
the output at the location where the probe is clipped. Carefully read and understand the High Voltage
Nanosecond Pulse Measurements document, which can be found at
www.eagleharbortech.com/support
prior to conducting any such measurements.
2.
Maintain load high voltage isolation and minimize stray capacitive coupling.
Stray capacitive coupling can cause significant issues that are not seen when operating with longer
pulses and/or slower rise times. Therefore, stray capacitive coupling must always be minimized. In
general, this involves keeping the HV output, leads, and load far from all grounded surfaces, cables,
and other equipment. A 2” minimum clearance between the high voltage output and other
components is recommended for the variants with output voltages of 20 kV or below, and 3”
minimum for 30 kV variants.
3.
Always connect both output leads to the load
If only one of the two outputs is connected to the load, potentials will shift unpredictably and currents
will flow through stray capacitive coupling rather than through the intended current path of the output
leads. This can cause damage to the system.
4.
Do not block airflow.
The NSP has air intakes on the bottom and an exhaust fan on the back. The bottom vents draw in air
from all around the unit. Unobstructed airflow is essential to keep internal components cool. Do not
obstruct the airflow by placing other objects close to the sides of the NSP, behind the NSP, or
underneath the NSP. Pulser failure and fire may result if these vents are blocked. If you smell burning
during operation, immediately turn off the pulser.
5.
Do not open or modify the NSP chassis.
The NSP chassis should remain sealed at all times. There are components that operate at high voltage.
Do not modify any part of the chassis from its original condition. Unsuitable modifications may result
in safety hazards. Any modification or signs of tampering will void the warranty.
6.
Use the appropriate AC circuit for power.
The AC power must be within the voltage/frequency range printed on the NSP back panel just below
the master power switch. The AC circuit must be grounded.
Summary of Contents for NSP Series
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