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Page 17 of 32
6.4
Free-running Mode Operation
In free running mode, the NSP will continuously output pulses as set by the pulse width, frequency, and
voltage knobs on the front panel. To operate in Free-running mode, ensure that the Internal/External
switch is set to “Internal”, and that the Base Pulse Repetition Frequency Knob is in any position except
“Single/Trigger”.
6.4.1
Adjusting Pulse Width
Output pulse width depends on load, voltage, and temperature. The value set by the coarse and fine knobs
is a nominal value, good to within 2 ns at the peak output voltage as measured into a 1 k
Ω
resistive load.
At lower voltages, the pulses are slightly longer. If a precise pulse width must be dialed in to an exact
number of nanoseconds, the user must measure the output waveform at their load. For a fixed load at a
given temperature, the output pulse width will always be stable and repeatable.
The pulse width can be adjusted while the
HV Output Switch
is set to
Enable
.
1.
Adjust the
Pulse Width – Coarse Control
to the desired value.
2.
Use the
Pulse Width – Fine Control
to fine-tune the desired value.
The total output pulse width is the sum of the coarse and fine pulse width control settings.
6.4.2
Adjusting Pulse Repetition Frequency
The pulse repetition frequency can be adjusted with the
Pulse Repetition Frequency – Base Control
and
Pulse Repetition Frequency – Multiplier Control
.
•
The output pulse repetition frequency is the product of the base pulse repetition frequency with
the pulse repetition frequency multiplier.
•
For example, if the base frequency is set to 2 kHz and the multiplier is set to x5, the output
frequency will be 10 kHz.
The pulse repetition frequency can be adjusted while the
HV Output Switch
is set to
Enable
.
6.5
Triggered Mode Operation
Triggered mode operation allows synchronization with external systems while maintaining the pulse
width settings on the front panel. Additionally, in this mode, the user can press the “Single Pulse” button
to output a single pulse, useful for initial testing or setting up a new load or experiment. To operate in
Triggered mode, ensure that the Internal/External Switch is set to “Internal”, and that the Base Pulse
Repetition Frequency Knob is in the “Single/Trigger” position.
6.5.1
Single Pulse Button
Press the “Single Pulse” button to output a single pulse with the voltage and pulse width set on the front
panel knobs.
6.5.2
Remote Trigger (Optional)
As an optional feature, the NSP can be remotely triggered. This allows for precision timing control and
allows the NSP to be synchronized with other events in the user’s experiment/application. This can also
be used to generate pre-defined bursts of shots, as needed by the user. In this mode, the pulse width and
voltage is still set by the front panel knobs. While running in triggered mode, the user can operate up to
Summary of Contents for NSP Series
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