EJ Series

Up to 60kV Regulated High Voltage DC Power Supplies

The EJ Series of 600 watt high voltage supplies feature flexible embedded controls with low ripple and noise. They are air insulated, fast response units, with tight regulation and extremely low arc discharge currents.


Specifications apply from 5% to 100% rated voltage. (Operation is guaranteed down to zero voltage with a slight degradation of performance.)

  • Input: User selectable via rear panel switch, 102 – 132 V RMS or 198 to 264 VRMS single-phase, 48-63 Hz, 1200 VA maximum at full load. C14 connector per IEC 60320 with mating line cords
  • Efficiency: Typically greater than 85% at full load
  • Output: Continuous, stable adjustment, from 0 to rated voltage or current by panel mounted optical rotary
    encoder or by external +10V signals. Voltage accuracy is 0.5% of setting + 0.2% of rated. Optical rotary encoder
    resolution: 0.025% with “Fine Adjustment” mode selected. 0.25% with “Coarse Adjustment” mode (default). Repeatability is < 0.1% of rated


  • Arc Quench: The HV output is inhibited for a short period after each load arc to help extinguish the arc
  • Arc Count: Internal circuitry constantly senses and integrates arcs that occur over a given time. In the event a system or load arcing problem develops and exceeds factory-set parameters, the power supply will cycle off in an attempt to clear the fault and then automatically restart after a preset “off dwell time”
  • Embedded Microcontroller Control: Front panel digital encoders provide high-resolution local adjustment of voltage and current program. Integral RS-232, USB and optional ethernet communications provide remote control program and monitor
  • Air Insulated: The EJ Series features “air” as the primary dielectric medium. No oil or encapsulation is used to
    impede serviceability or increase weight
  • Low Ripple: Typically, ripple is less than 0.1% peak to peak of rated voltage at full load
  • Constant Voltage/Constant Current Operation: Automatic crossover from constant-voltage to constant-current regulation provides protection against overloads, arcs, and short circuits
  • Constant Current/Current Trip: A rear panel selector switch on the remote chassis allows selection of either current mode
  • Tight Regulation: Voltage regulation is better than 0.005% for allowable line and load variations. Current regulation is better than 0.1% from short circuit to rated voltage

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