4 kW & 8 kW Regulated
DC Power Supplies
3 kV to 125 kV
150 kV to 400 kV
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|The PK family of power supplies are sophisticated, 4 and 8 kW air
insulated high voltage DC power supplies offering low ripple and noise, fast response, and tight regulation.
Complies with the European harmonized low voltage (safety) directive, 73/23/EEC. Compliance with the EMI
directive, EN50082-2 is available.
Pulse-Width Modulation. Off-the-line pulse-width modulation provides
high efficiency and a reduced parts count for improved reliability.
Air Insulated. The PK Series features "air" as the primary dielectric
medium. No oil or encapsulation is used to impede serviceability, or increase weight.
Constant Voltage/Constant Current Operation. Automatic crossover from
constant-voltage to constant-current regulation provides protection against overloads, arcs, and short circuits.
Current Trip. This feature may be substituted for constant-current
operation by a jumper on the rear panel interface connector.
Tight Regulation. Voltage regulation is typically better than 0.01%
for allowable line and load variations. Current regulation is better than 0.1% from short circuit to rated
Higher Power Capability. Power supply modules can be paralleled for 8
kW output power utilizing one master control module and one slave module.
Operating Parameters at a Glance Output voltage and current are
displayed on separate 3 ½ digit LCD displays with selectable damping. Dual LED bar graphs provide "analog"
indication of rapidly changing output level. A full set of indicators are provided to determine the status
of the supply at a glance. These include indicators for AC power on, high voltage on, standby, safety
interlock, external trip, output polarity, regulating mode (voltage or current) and remote control status of
mA program, kV program, and HV enable.
Warranty. Standard power supplies are warranted for three years; OEM
and modified power supplies are warranted for one year. A formal warranty statement is available.
(Specifications apply from 5% to 100% of rated voltage. Operation is
guaranteed down to zero with a slight degradation of performance.)
Input: 4/8 kW, 3-phase: 187-228 V RMS, 48-63 Hz, fused for 20 A (per
4 kilowatt module), derate for line unbalance > 2%. 5-position terminal block, with cover, provided. 8 kW
supplies have one additional terminal block for the slave.
Output: Continuous, stable adjustment from 0 to rated voltage/current
by means of panel mounted 10-turn potentiometers with 0.05% resolution, or by external 0-10 V signals.
Repeatability better than 0.1% of full scale. Accuracy is 1% of rated + 1% of setting
Voltage Regulation: Load, better than 0.01% for no load to full load
variations; Line, better than ±0.01% over specified input range.
Current Regulation: Load, better than 0.1% +100
µA , from short circuit
to rated voltage at any rated load condition; Line, better than better than ±0.01% over specified input range.
Ripple: Better than 0.1% RMS of rated voltage at full load up to
125 kV. Better than 0.05% RMS for 150 kV and higher.
Stability: 0.01% per hour after 1/2 hour warm-up; 0.05% per 8 hours.
Temperature Coefficient: 0.01%/°C.
Ambient Temperature: -20 to +50° C, operating; -40 to +85° C, storage.
Protection: Automatic current regulation protection reduces output
voltage as required for all arc, overload and short circuit conditions. Fuses, surge-limiting resistors, and
low energy components provide the ultimate protection.
Accessories: Detachable, 8 foot, shielded high voltage coaxial cable
provided with fully enclosed models (see models chart for cable type). Enclosed 8 kW models are provided with
an additional HV cable for the slave module. A 25 pin D-subminiature connector for customer interface is
provided. Harness and/or interconnection cables supplied for 8 kW models as required.
Polarity: Available with either Positive, Negative, or Reversible
polarity with respect to chassis ground.
Current Limit: In current limit mode the power supply will regulate
the load current at the programmed current level with automatic crossover between voltage and current
Current Trip: A jumper installed on the 25 pin interface connector
located on the rear of the control panel assembly allows the selection of current trip operation. When in
current trip mode, the HV output will disable and latch off when the load current reaches the programmed
current level. Reset is accomplished by either cycling the AC power, toggling the HV enable signal, or by
pushing the HV off/reset and then the HV on switches.
Analog Monitors: Current and voltage, 0 - 10 V equivalent to 0 -
rated output. 10 k ohm (1%), output impedance.
Voltage accuracy: 1% reading +1% of rated voltage. Current accuracy:
1% reading +0.05% of rated current.
Digital Monitor Signals: Four functions as follows - Milliampere
Control, Kilovolt Control, High Voltage Enable, No Fault. High active, TTL or 5 V CMOS compatible. Typical
signal compatibility; source = 1.0 mA at 2.5 V, sink = 2.5 mA at 0.4 V.
Digital HV On/Off Control:
HV Enable: Remote signal to activate high voltage (front panel
switch selectable). High, on; low, off.
External: Remote signal to disable high voltage (overrides local or remote enable); High, disable.
External has two user programmable modes; level-controlled interrupt or momentary-triggered shutdown.
Both inputs are TTL or 5 V CMOS compatible. Input is active upon application
of 2.2 - 15 V signal. Approx.. input impedance: 100 k ohms @ 0 - 5 V; 10 k ohms @ 15 V.
External Interlock: Contact closure to common = enable; contact open =
disable. Latching with reset via the HV off/reset switch or HV enable signal.
Opto-Output: An opto-isolated NPN transistor output is provided that
can be controlled by any one of the Digital Monitor signals. This is not intended to be used for high
Front Panel Elements (See outline drawing)
AC Power: On/Off rocker switch and pilot lamp.
HV Enable: Momentary push-button and indicator.
HV Off/Reset: Momentary push-button and associated pilot lamps: Standby, Interlock, External.
Output Meters: Kilovolts, Milliamperes, 3 ½ digit LCD displays, accuracy 1% of full scale.
Output Controls: Kilovolts, Milliamperes, 10-turn with locking vernier dials.
Polarity: Indicators for positive or negative output with respect to ground.
Trend Indicators: 10 segment bar graphs to provide indication of rapidly moving output parameters
Mode Indicators: LED's for indication of regulating mode (voltage and current).
Remote Programming: Selector switches with indicators for remote/local selection of voltage, current, and HV enable.
Slave Front Panel Elements
Indicators: Bias, Tracking, & Overvoltage.
TP-I - Slave Current
TP-V - Slave Voltage
TP-C - Common
Rear Panel Elements (See outline drawing)
DS1: Power On indicator
E1: Chassis ground
F1, 2, 3: Input line fuses
J1: Customer interface connector
JHV1: HV Output connector
TB1: AC Input connector
TB2: Ground, Common, Interlock connector
||Zero start interlock. Voltage control, local or
remote, must be at zero before HV will enable.
||Slow start ramp. Specify standard times of 5, 10,
15, 20, or 30 seconds ± 20%.
||Differential control interface for remote analog
I/O signals. Provides a ±3 V DC common mode rejection.
||Low active HV Enable and External inputs, low
active digital monitor outputs.
||Low output ripple version.
||CE Marked. Complies with the European harmonized
EMI directive, EN50082-2, and with the low voltage (safety) directive, 73/23/EEC.
||RS-232 control and monitor.
|Please consult factory for
Click on the model number below to request a quote and
for complete ordering part number.
4 kW, Fully Enclosed
Maximum weight is 62 lbs. to 75 kV, 85 lbs. to 125 kV.
4 kW, Open Stack
Maximum weight is 125 lbs.
8 kW, Fully Enclosed (for models to 15 kW, consult factory)
Maximum weight is 125 lbs. to 75 kV, 170 lbs. to 125 kV.
8 kW, Open Stack
Maximum weight is 200 lbs.
Front Panel Controls & Indicators
Outline Drawing 3 - 75 kV
Outline Drawing 80 - 125 kV
Outline Drawing 150 - 400 kV