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Summary of Contents for BNC PVX-4151
- Page 1 BERKELEY NUCLEONICS CORPORATION PVX-4151 PULSE GENERATOR OPERATION MANUAL Berkeley Nucleonics Corp. San Rafael USA 415-453-9955...
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Page 2: Table Of Contents
TABLE OF CONTENTS 1.0 GENERAL DESCRIPTION ................4 2.0 SPECIFICATIONS ..................5 3.0 SAFETY .......................6 3.1 Operating Safety Summary ...............6 3.1.1 Power Source ..............6 3.1.2 Grounding................7 3.1.3 Cover Removal..............7 3.1.4 General Operating Precautions ...........7 3.2 Servicing Safety Summary ..............7 3.2.1 Servicing Procedure ............7 3.2.2 Internal Energy Storage............7 4.0 OPERATING CONSIDERATIONS...............9 4.1 Output Cabling ..................9... - Page 3 8.1 Over-Current Failure .................19 9.0 WARRANTY ....................19 APPENDIX......................21 Typical Output Waveforms ..............21...
- Page 4 SAFE OPERATING PROCEDURES AND PROPER USE OF THE EQUIPMENT ARE THE RESPONSIBILITY OF THE USER OF THIS SYSTEM. Berkeley Nucleonics Corporation (BNC) provides information on its products and associated hazards, but it assumes no responsibility for the after-sale operation and safety practices.
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Page 5: General Description
The PVX-4151 will generate an output voltage swing of 1500 volts, and output current of 16 amperes peak and .05 amperes continuous. It produces very flat voltage pulses to DC into a capacitive load. -
Page 6: Specifications
Gate Source External Gate Input +5V ±1V into 50Ω Gate Rise Time <20ns Gate Input Connector Type BNC, Front Panel VOLTAGE MONITOR Voltage Monitor 1000:1 into 1 MegΩ, 20 MHz Bandwidth Limit Voltage Monitor Connector Type BNC, Front Panel CURRENT MONITOR Current Monitor Type 10A/V into 50Ω, 20 MHz Bandwidth... -
Page 7: Safety
PVX-4151, V is the pulse voltage, and F is the pulse repetition frequency (or the total pulses per second). (For these calculations, the internal capacitance of the PVX-4151 is 200pF, and RG-62 cable is 13pf/foot.) Given the maximum dissipation of 150W, the maximum load capacitance, frequency and/or voltage at which the PVX-4151 can operate can be approximated using this formula. -
Page 8: Grounding
3.1.2 Grounding The PVX-4151 is grounded through the grounding conductor of the AC power cord. To avoid electrical shock, plug the PVX-4151 into a properly wired receptacle before making connection to any input or output connectors. Use only a power cord that is in good condition. - Page 9 The voltmeter used to make these measurements must be certified for use at 3000VDC and 220VAC or greater. Dangerous voltages, floating ground planes and energy storage exist at several locations in the PVX-4151. Touching connections and/or components could result in serious injury.
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Page 10: Operating Considerations
An input trigger of +5V ±1V into 50Ω with a risetime of <20ns is required to gate on the PVX-4151. Departure from these values can result in a loss of performance. These trigger requirements are met by any high quality low voltage pulse generator. -
Page 11: Controls And Indicators
"OUTPUT ENABLED" LED above the switch is illuminated. If the enable LED is not illuminated, the PVX-4151 will not generate an output pulse. The external interlock circuit (on the rear panel DSUB... -
Page 12: Gate Connector
4.6.3 Gate Connector The BNC connector labeled "GATE" is the input to gate the pulser. The input should be +5V into 50Ω, with a rise time less than 20ns. The output pulse width and frequency are controlled by the input gate's width and frequency. -
Page 13: Remote Control
4.7 Remote Control The PVX-4151 has the capability to be operated through remote controls. The following table provides the pinout of the 15 pin DSUB connector on the rear panel. FUNCTION DESCRIPTION Ground Ground Ground Ground Ground Output: Active low, open drain, 24 mA... - Page 14 The INTERLOCK pin must be pulled low or jumpered to pin 4 in order to satisfy the PVX-4151’s interlock circuit. If the INTERLOCK pin is not pulled low or jumpered to pin 4, the user will not be able to enable the output.
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Page 15: Preparation For Use
This connector must be installed in order to satisfy the interlock circuit. If it is not installed, the unit cannot be enabled. In order to operate the PVX-4151 remotely or to use an external interlock, wire the DSUB connector accordingly (see the... - Page 16 10. If there is no output from the PVX-4151, or the output is severely distorted, turn OFF the high voltage power supplies. Leave the PVX-4151 connected...
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Page 17: Operating Instructions
4. Pulsed power systems are capable of random triggering via transients and therefore when the PVX-4151 is turned on, or voltage is present in the chassis, assume it is possible to get a pulse on the output connector. -
Page 18: Troubleshooting
3. Leave the PVX-4151 connected to the AC input without high voltage and with all connectors in place for approximately five minutes to bleed off the stored energy. 4. Disconnect the AC power to the unit. 7.0 TROUBLESHOOTING WARNING The PVX-4151 contains capacitors that are used as energy storage elements. -
Page 19: Fuses
No high voltage. Check power supplies • Output not connected correctly. Check all cables and connections. Pulser is damaged. Contact BNC customer • service. 7.1.1 Fuses To avoid fire hazard or damage to the driver, use only the fuse types listed below. -
Page 20: System Failure Modes
DO SO VOIDS THE WARRANTY. 8.1 Over-Current Failure When the output is shorted, the PVX-4151 can deliver in excess of 16A of current (depending on cabling, pulse power supply setting, etc.). A current pulse of this magnitude is in excess of the driver's specifications. If allowed to operate into a short for an extended period of time, damage to the unit, load and/or associated cabling may result. - Page 21 BNC's option, refund of the purchase price, taxes and transportation charges incurred by the purchaser. BNC will not be responsible for or liable to the purchaser for consequential losses or damages asserted to be attributable to a claimed defect in the equipment provided.
- Page 22 APPENDIX Typical Output Waveforms <60ns Minimum Pulse Width, 1500V Output 18ns Rise & Fall Times, 1500V Output (25ns/Div horizontal scale, 300V/Div vertical scale) (10ns/Div horizontal scale, 300V/Div vertical scale) Typical Output Waveform, 1500V 244KHz Frequency, 1500V Output (1µs/Div horizontal scale, 300V/Div vertical scale) (2.5µs/Div horizontal scale, 300V/Div vertical scale)
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