the pulse of the future directed energy incorporated PVX-4140 3,500v pulse generator ? 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 the PVX-4140 pulse generator produces fast, high volt- age 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 spec- trometers 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 in- tensifiers. 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 gener- ate 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 sup- ply inputs. the output pulse width and frequency are con- trolled by the gate signal. the pulse output voltage is con- trolled by the amplitude of the input dc power supplies. when the input gate is high, the v high supply is connected to the output. when the input gate is low, the v low supply 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 v low input supply is connected to the output, thereby generating a negative-going pulse. the PVX-4140 features front panel indicator leds to moni- tor the status of the pulse generator. front panel instru- ment-quality voltage and current monitors provide a straightforward means to view the output voltage and cur- rent waveforms in real-time, eliminating the need for an ex- ternal high voltage oscilloscope probe. the pulse generator is a direct-coupled, air-cooled solid- state 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 gen- erator 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.
the pulse of the future 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 specifications (all specifications measured into a 50pf load connected with 6 feet (~1.8m) of rg-59 (75 ?) coaxial cable) doc #9200-0213 rev 5 ? directed energy, inc. 2000 output maximum value: 3500 volts (v high - v low ) minimum value: 0 volts means of adjustment: controlled by power supply input voltages pulse rise and fall time: 25ns (10% to 90%) pulse width: 60ns to dc, controlled by input gate pulse recurrence frequency (prf): single shot to 30khz at 3500v continuous output, maximum limited by power dissipation (1) , 5mhz burst, controlled by input gate max. average power: 100w (v high + v low ) (1) max. duty cycle: continuous droop: <1% over/undershoot: <5% throughput delay 120ns typical jitter: <200ps shot-to-shot output connector & cable: shv, with 6 feet (~1.8m) rg-59 (75 ?) coaxial cable input dc voltage +v in (v high ) absolute max. value: +3500 volts absolute min. value: -3500 volts relative max. value: +3500 volts over v low voltage relative min. value: +0v over v low voltage input dc voltage -v in (v low ) absolute max. value: +3500 volts absolute min. value: -3500 volts input dc connectors: shv, rear panel (one each for +v in and -v in ) 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: 90vac to 240vac, 50/60hz dimensions (excluding con- nectors): 19? w x 5.2? h x 13? d (48.25cm w x 13.2cm h x 33cm d) weight (approximate): 18 lbs. (8.2 kilograms) specifications subject to change without notice gate 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) the power dissipated in the PVX-4140 when driving a capacitive load is defined by the for- mula cv 2 f, where c is the total load capacitance, including the capacitance of the load, inter- connect 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 inter- nal 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. >5mhz burst frequency, 3000v output (250ns/div horizontal scale, 500v/div vertical scale) 60ns minimum pulse width, 3500v output (25ns/div horizontal scale, 500v/div vertical scale) 25ns rise & fall times, 3500v output (50ns/div horizontal scale, 500v/div vertical scale) typical output waveform, 3500v (100s/div horizontal scale, 500v/div vertical scale)
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