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Details, datasheet, quote on part number:PVX-4140
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Datasheet text preview:
THE PULSE OF THE FUTURE
PVX-4140
± 3 , 5 0 0 V P U L S E G E N E R AT O R
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The PVX-4140 pulse generator produces fast, high voltage wave forms to 3,500V. Optimized for high impedance capacitive loads, the PVX-4140 is well suited for driving extraction grids and deflection plates for electrostatic modulation of particle beams in time-of-flight mass spectrometers and accelerators. Its robust and versatile design also makes it well suited for pulsing or gating power tube grids, Pockels cells and Q Switches, acoustic transducers, microchannel plates, photomultiplier tubes and image intensifiers. The exceptional pulse fidelity of the PVX-4140 will optimize the performance of any system in which it is used. The PVX-4140 generates an output voltage pulse of 3,500 volts with rise and fall times of 25ns or less, with very flat voltage pulses to DC into a capacitive load. It can generate singled-ended output pulses from ground to +3500V or from ground to 3500V, and can also generate pulses originating from a DC voltage offset from ground by using both VLow and VHigh power supply inputs. This offset can be from 3500V to +3500V, with a maximum power supply voltage differential of 3500V. The PVX-4140 requires a user-supplied TTL gate signal, a high voltage DC power supply and optional DC offset supply inputs. The output pulse width and frequency are controlled by the gate signal. The pulse output voltage is controlled by the amplitude of the input DC power supplies. When the input gate is high, the VHIGH supply is connected to the output. When the input gate is low, the VLOW supply
0 to ±3500V Pulse Output 25ns Rise And Fall Times 60ns to DC Pulse Width >30KHz Pulse Repetition Frequency Optimized To Drive Deflection Plates, Grids, Pockels Cells And Other Capacitive Loads Protected Against Arcs, Shorts And Load Transients Voltage And Current Monitor Outputs
is connected to the output. Therefore the PVX-4140 can be used to generate a negative-going pulse by logically inverting the input gate, so that the input gate is high until the unit is pulsed. When the input gate goes low, the VLOW input supply is connected to the output, thereby generating a negative-going pulse. The PVX-4140 features front panel indicator LEDs to monitor the status of the pulse generator. Front panel instrument-quality voltage and current monitors provide a straightforward means to view the output voltage and current waveforms in real-time, eliminating the need for an external high voltage oscilloscope probe. The pulse generator is a direct-coupled, air-cooled solidstate half-bridge (totem pole) design, offering equally fast pulse rise and fall times, low power dissipation, and virtually no over-shoot, under-shoot or ringing. It has over-current detection and shut-down circuitry to protect the pulse generator from potential damage due to arcs and shorts in the load or interconnect cable. All control and protection logic circuitry, support power, energy storage and output network are incorporated into the PVX-4140. It can be connected directly to the load, and does not require series or shunt resistors, impedance-matching networks between the pulser and the load, or additional energy storage (capacitor banks). All of this is taken care of within the PVX-4140.
DIRECTED ENERGY INCORPORATED
THE PULSE OF THE FUTURE
SPECIFICATIONS (All specifications measured into a 50pF load connected with 6 feet (~1.8M) of RG-59 (75) coaxial cable)
OUTPUT Maximum Value: Minimum Value: Means Of Adjustment: Pulse Rise And Fall Time: Pulse Width: Pulse Recurrence Frequency (PRF): Max. Average Power: Max. Duty Cycle: Droop: Over/undershoot: Throughput Delay Jitter: Output Connector & Cable: ±3500 Volts (VHigh - VLow) 0 Volts Controlled By Power Supply Input Voltages 25ns (10% to 90%) 60ns to DC, Controlled by Input Gate Single shot to 30KHz at 3500V continuous output, maximum limited by power dissipation (1), 5MHz Burst, Controlled by Input Gate 100W (VHigh + VLow) (1) Continuous <1% <5% 120ns Typical <200ps shot-to-shot SHV, With 6 feet (~1.8M) RG-59 (75) Coaxial Cable
60ns Minimum Pulse Width, 3500V Output
(25ns/Div horizontal scale, 500V/Div vertical scale)
INPUT DC VOLTAGE +VIN (VHigh) Absolute Max. Value: +3500 Volts Absolute Min. Value: -3500 Volts Relative Max. Value: +3500 Volts over VLow Voltage Relative Min. Value: +0V Over VLow Voltage INPUT DC VOLTAGE -VIN (VLow) Absolute Max. Value: +3500 Volts Absolute Min. Value: -3500 Volts Input DC Connectors: SHV, Rear Panel (One each for +VIN and -VIN) GATE Gate Source & Connector TTL into 50, into BNC connector on the end panel VOLTAGE & CURRENT MONITORS Voltage Monitor: 1000:1 into 1 Meg, BNC connector Current Monitor: 10A/V into 50, BNC connector GENERAL Support Power: Dimensions (Excluding Connectors): Weight (Approximate): 90VAC to 240VAC, 50/60Hz 19" W x 5.2" H x 13" D (48.25cm W x 13.2cm H x 33cm D) 18 lbs. (8.2 Kilograms)
25ns Rise & Fall Times, 3500V Output
(50ns/Div horizontal scale, 500V/Div vertical scale)
Typical Output Waveform, 3500V
(100µs/Div horizontal scale, 500V/Div vertical scale)
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
These specifications are measured driving a 50pF load connected with 6 feet of RG-59 cable, at 3500V output. However the PVX-4140 can drive loads of a few picofarads to several hundred picofarads of capacitance, limited by its maximum power dissipation capability(1) . At lower load capacitances and/or voltages less then 3500V, the PVX-4140 can operate at continuous pulse recurrence frequencies up to 400KHz. The PVX-4140 can also drive resistive or inductive loads, within limitations. Contact DEI for additional information and applications assistance.
(1)
>5MHz Burst Frequency, 3000V Output
(250ns/Div horizontal scale, 500V/Div vertical scale) Doc #9200-0213 Rev 5 © Directed Energy, Inc. 2000
The power dissipated in the PVX-4140 when driving a capacitive load is defined by the formula CV2F, where C is the total load capacitance, including the capacitance of the load, interconnect cable, and the internal capacitance of the PVX-4140, 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-4140 is 120pF, and RG-59 cable is 21.5pf/foot.) Given the maximum dissipation of 100W, the maximum load capacitance, frequency and/or voltage at which the PVX-4140 can operate can be approximated using this formula. This formula also approximates the high voltage power supply requirements needed to drive a given load at a specific voltage and frequency. This formula is not applicable when driving resistive or inductive loads.
Directed Energy, Inc. An IXYS Company 2401 Research Blvd., Suite 108 Fort Collins, CO USA 80526 970-493-1901 Fax: 970-493-1903 Email: deiinfo@directedenergy.com Web: http://www.directedenergy.com
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