NANOSECOND PULSE GENERATOR NPG-15/2000(N) USER MANUAL © 2013 Megaimpulse Ltd.
Copyright © 2013 MEGAIMPULSE Ltd. All Rights Reserved. MEGAIMPULSE LTD. PROVIDES THIS MANUAL "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OR CONDITIONS OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MEGAIMPULSE LTD.
CONTENTS Package content ................................................................................................ 2 General view of NPG-15/2000(N) nanosecond pulse generator ....................... 2 Safety manual ................................................................................................... 3 Technical specification ..................................................................................... 4 Front and rear panels view ................................................
PACKAGE CONTENT Please check the package for the following items: NPG-15/2000(N) nanosecond pulse generator (hereinafter "generator") Power supply cable High voltage output coaxial cable Two optical cables User manual Fig.1. General view of NPG-15/2000(N) nanosecond pulse generator. MEGAIMPULSE LTD.
SAFETY MANUAL Electrical safety NPG-15/2000(N) generator is high voltage equipment. Please be very careful and operate by qualified personnel only. There is a risk of electric shock, strong electromagnetic interference, damage of generator or other electronic equipment in case of improper use. Do not switch on the generator without proper grounding. We recommend to use grounding cable connected to the terminal at the rear panel of the generator.
TECHNICAL SPECIFICATION OF NPG-15/2000 NANOSECOND PULSE GENERATOR Output pulse voltage Regulated 13 - 18kV at matched 75 Ohm load, up to 36kV at discharge reactor Pulse polarity positive (NPG-15/2000) negative (NPG-15/2000N) Pulse rise time (0.1 – 0.9 Umax) 4 ns Max pulse energy 30 mJ Peak pulse power 4.5 MW Repetition rate up to 3.
FRONT VIEW 2 4 5 6 7 8 9 10 REAR VIEW 1 3 11 12 1 - power supply ON/OFF switch 2 - output coaxial connector 3 - power supply connector and fuse holder 4 - HV ON/HV OFF - high voltage on/off switch 5 –EXT/INT - external/internal triggering switch 6 - optical SYNC OUT connector 7 - overheat LED 8 - AMPLITUDE regulation knob 9 - FREQUENCY regulation knob 10 - optical SYNC IN connector 11 - fans 12 - ground terminal NPG-15/2000 nanosecond pulse generator user manual 5
PUTTING THE GENERATOR INTO OPERATION Please follow strictly the described steps. It helps to prevent damage of the generator, other equipment, and personnel injury. Step 1. Unpack items: - the generator and check the presence into the package of the following NPG-15/2000(N) generator power supply cable output 75 Ohm coaxial cable two 3 meters length optical cables Step 2. Set up the generator. Ground it obligatory by connecting ground cable to terminal at the rear panel (12). Step 3.
Step 4. Connect the other side of coaxial cable to the load. The cone teflon insulator is used at the cable end to prevent the discharge between central cable wire and the cable braid (See Fig.2). You may use additional wires for connection: solder the high voltage signal wire to the central cable wire and screw/solder ground signal wire to the ground clamp. It is recommended to use as short additional wires as possible.
Step 5. Switch on the high voltage by HV ON/HV OFF switch. The output high voltage pulses should be generated. Increase the amplitude and frequency by corresponding knobs as necessary. The output pulses frequency in internal triggering mode is about proportional to the rotation angle of FREQUENCY regulation knob.
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.
generator, i.e. internal generator frequency sets the upper limit for external triggering pulses frequency. Please rotate FREQUENCY regulation knob to the most clockwise position to allow the maximum external triggering pulses frequency. The minimum repetition rate is 50 Hz. The lower frequency results in decreasing of output pulses amplitude. Burst mode Burst operation mode can be simply organized by using external pulse generator.
