the pulse of the future directe d energ y incorporated pvm - 4210 dual output high voltage pulse generator modul e simultaneous positive and negative 0 to +950v and 0 to ? 950v pulse outputs 1,900v differential output <15ns rise and fall time s <40ns to dc pulse width >20khz pulse repetition frequency internal high voltage power supplies optimized to drive deflection plates, pockels cells, q - switches and other capacitive loads economical, modular solid state design t he pvm - 4210 is a compact, oem - style pulse generator module providing two simultaneous differential voltage pulses of up to 950v (1,900v differential), with pulse rise and fall times <15 nanoseconds, and pulse widths continuously adjustable from <40 nanose conds to dc. the pulser operates on +24vdc to +28vdc support power, and features integrated dc high voltage power supplies. the pvm - 4210 is optimized for differential drive of deflection plates for electrostatic modulation of particle beams in time - of - flight mass spectrometers and accelerators. it will also drive any high impedance, capacitive load such as pockels cells and q - switches, electrodes, microchannel plates, acoustic transducers, image intensifiers and photomultiplier tubes. the exceptional pulse fidelity of the pvm - 4210 will optimize the performance of any system in which it is used. the module provides two pulse output channels, controlled by a common control logic. when the control logic receives a gate signal, both channels pulse simul taneously. one channel pulses from ground to the positive high voltage, and the other channel pulses from ground to the negativ e high voltage. therefore each output can be connected to the electrodes of a pockels cell or q - switch, or to a pair of deflecti on plates, providing a 1,900v differential pulse across the cell or plates. these outputs may also be inverted, to pulse from th e high voltage potential to ground. the width and frequency of the output pulses follow the width and frequency of the ttl inpu t gate. the amplitude of the output pulse voltage for each channel is independently adjus t- able from 0 to 950v using screwdriver - adjustable potentiometers readily accessible on the end panel of the pulser module. the p vm - 4210 requires +24vdc to +28vdc support power and a ttl gate signal. for safety and control flexibility, a ttl level signal i s used to enable and disable the dc power supplies. each channel is a 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. the unit has over - current detection and shut - down circuitry to protect the pul se generator against potential damage due to arcs and shorts in the load or interconnect cables. unlike some competing solid state switches, the pvm - 4210 is a co m- plete pulser solution with high voltage power supplies, energy storage and output network, ready for use. it can be connected d irectly to the load, and does not require series or shunt resistors, impedance - matching networks between the pulser and the load, or additional e n- ergy storage (capacitor banks). all of this is taken care of within the pvm - 4210. the pulser is housed in an aluminum enclosure, with threaded mounting holes in the base to simplify installation and asse m- bly in oem applications. the pvm - 4210 is a direct - coupled, all solid - state design using air as the primary insulating medium. its conservative design margin gives you long component life. and keeping the pvm - 4210 free of potting compound or encapsulatio n materials makes it easy to service if a component ever does require replacement. some co m peting products are potted, and must be replaced if they fail. but compactness and durability are not all you get in the pvm - 4210. inherent in the design is exceptional pulse fidelity with virt u- ally no ringing, over - shoot or under - shoot, and protection against arcs, shorts and load transients in a reliable, economical mo dule.
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 output pulse electrical characteristics (specifications apply to both output channels) output voltage 0 to +950v 5v (channel 1), 0 to ? 950v 5v (channel 2) output voltage adjustments screwdriver - adjustable potentiometers, end panel pulse width <40ns to dc measured fwhm, controlled by input gate pulse rise and fall time 15ns, 10% - 90% pulse recurrence frequency single shot to >20khz continuous, 5mhz burst, controlled by input gate (1) pulse droop <1% over/undershoot <5% jitter <1ns shot - to - shot throughput delay (delay from leading edge of input gate to leading edge of output pulse) 93ns typical maximum duty cycle continuous maximum average power (per channel) 4w (1) pulse output connectors shv, end panel output cables 12? (~30cm) belden 8218 75 w coaxial cable gate gate source external gate input ttl into 50 w gate rise time <20ns gate connector dsub, end panel general support power 24vdc to 28vdc @ 600ma maximum current dimensions (excluding connectors) 5.5?w x 11?l x 1.75?h (140mm w x 279.5mm l x 44.5mm h ) weight (approximate) 41 ounces (1.16 kilograms) specifications subject to change without notice specifications (all specifications measured into a 50pf load connected to each of the two outputs with 12? (~30cm) of belden 821 8 75 w coaxial cable ) min. pulse width: 38ns at 950v 10ns/div horizontal scale, 200v/div vertical scale typical differential output, 950v 2.5 s /div horizontal scale, 318v/div vertical scale, center horizontal trace is ground 20khz frequency, both channels 25 s /div horizontal scale, 318v/div vertical scale pulse fall time: 13ns at 950v 10ns/div horizontal scale, 200v/div vertical scale 5mhz pulse burst, 950v output 250ns/div horizontal scale, 200v/div vertical scale ( 1) the power dissipated in each channel of the pvm - 4210 when driving a capacitive load is defined by the formula cv 2 f, where c i s the total load capacitance, including the capacitance of the load, interconnect cable, and the internal capacitance of the pvm - 4210, v is the pulse voltage, and f is the pulse repetition frequency (or the total pulses per second). (for these calculations, the internal c a- pac i tance of the pvm - 4210 is 125pf, and belden 8218 cable is 21.5pf/foot.) given the maximum power supply capability of 4w (4ma) per channel, the maximum load capacitance, frequency and/ or voltage at which the pvm - 4210 can operate can be approximated using thi s formula. a t lower load capacitances and/or voltages less then 950 v, the pvm - 4210 can operate at continuous pulse recurrence f requencies greater than 20khz. this formula is not applicable when driving non - capacitive (resistive or inductive) loads. conta ct dei for information or assistance in using the pvm - 4210 with different load characteristics or impedances. 9200 - 0204 rev 3 ? directed energy, inc. 2000
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