OVERHEAT MODE
NPG-15/2000(N) generator has 75 Ohm impedance coaxial output connector. If
the generator operates on unmatched load with impedance not equal to 75 Ohm
then part of energy inevitably reflects from the load, returns back to generator, and
dissipate in it. About all of generated energy returns back in case of operation on
short or open load. Generator can withstand short or open load, but in case of long
time operation in such regime it may be overheated.
"Overheat" LED lights on in this case and generator stop the operation. Please
switch off high voltage by HV ON/HV OFF switch and allow fans to cool the
generator for a several minutes. "Overheat" LED lights off after the cooling and
generator is ready for operation again.
Unfortunately barrier and other discharge type loads have highly nonlinear nature
and some reflection of energy inevitably occurs. If the generator overheats while it
operates on discharge reactor you can try:
- change the parameters or operation regime of the reactor to increase the part of
energy absorbed in it. To estimate the energy reflected from the load check the
amplitude of the secondary and following pulses by oscilloscope with high
voltage probe connected to the load. You should use 500 MHz or more
bandwidth oscilloscope and 40 kV pulse voltage probe, for example Tektronix
TDS 3052C and Tektronix P6015A probe;
- reduce pulse amplitude and/or frequency.
TRIGGERING OF THE GENERATOR
The generator can operate in three different triggering modes:
Internal triggering
Internal triggering mode is set by switching EXT/INT toggle switch in INT
position. No any additional triggering generator is required for operation in this
regime. Output pulse repetition rate can be adjusted by FREQUENCY regulation
knob at the front panel of the generator.
External triggering
External triggering mode is set by switching EXT/INT toggle switch in EXT
position. External pulse should be applied to optical SYNC IN connector for
generator triggering. Recommended triggering pulse duration is one microsecond.
The delay between triggering pulse front and output pulse (internal generator
delay) is about 300 µs. The maximum allowable pulse repetition rate in this
mode is limited by FREQUENCY regulation knob at the front panel of the
MEGAIMPULSE LTD. 8
NPG-15/2000 nanosecond pulse generator user manual 9
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