Glassman High Voltage is a leading designer and manufacturer of High Voltage power supplies/DC power supplies for the High Voltage and Vacuum Process equipment market segments. A Glassman DC power supply can range in output from 15W-50kW with output voltages operating down to 50V thru 400kV.  A High Voltage power supply of this type can be offered in modular or Rack-mount configuration as well as special packaging to meet customer-specific mechanical requirements. Most Glassman DC power supplies are offered utilizing proprietary Air Insulation dielectric technology. Air poses numerous reliability and serviceability benefits in comparison to competing solid and liquid dielectric technologies.
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LH Open
Stack Series
4 kW Regulated
High Voltage
DC Power Supplies

200 kV to 500 kV
CE Compliant

Parallelable up to 20 kW

RoHS Compliant

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PK Series HV Power Supply
Driver and Remote Panel

PK Series HV Power Supply
4 kW System

The LH open stack family are sophisticated 4 kW power supplies with extremely low ripple and noise. They are air insulated fast response units with tight regulation.

Please refer to Technology > Applications page on our web site for typical applications.

The LH Series, when configured with the 400 VAC input option, are fully compliant with the following European Directives:
EN61010/ IEC61010, Safety
EN61000-6-4, Conducted and Radiated Emissions
EN61000-6-2:2005, Conducted and Radiated Immunity
2011/65/EU, Restriction of the use of Hazardous Substances (RoHS)

Features Specifications Options Models Outlines


Arc Quench. The HV output is inhibited for a short period after each load arc to help extinguish the arc.

Arc Sensing. Internal circuitry constantly senses and integrates arcs that occur over a given time. In the event that a load arcing problem develops, the power supply will cycle off, then automatically restart.

Embedded Microcontroller Control. Integral RS-232, USB and optional Ethernet communications provide remote control program and monitor.

Air Insulated. The LH 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.

Parallelable. One master supply and up to 4 slave supplies provide a maximum of 12 - 20 kW depending on kV.
Pulse-Width Modulation. Off-the-line pulse-width modulation provides high efficiency and a reduced parts count for improved reliability.
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.

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% rated voltage. (Operation is guaranteed down to zero voltage with a slight degradation of performance.)

Input: 187-228 V RMS, 3, 48-63 Hz, 5500 VA maximum at full load. Less than 16A/ at 208 VAC. A five position terminal block with protective cover is provided on the rear panel of the driver chassis.  Mains service must be protected with fuses or circuit breakers with a maximum rating of 125 A for 200/208 VAC models & 100 A for 400 VAC models. 

Efficiency: Typically 80% at full load.

Output: Continuous stable adjustment from 0 to rated voltage or current by panel mounted 10-turn potentiometers with 0.05% resolution, or by external 0 to 10 V signals is provided. Repeatability better than 0.1% of setting. Voltage accuracy is 0.5% of setting + 0.2% of rated.

Static Voltage Regulation: Better than +/- 0.005% for specified line variations and 0.005% for no load to full load variations.

Current Regulation: Better than 0.1% from short circuit to rated voltage at any load condition, when in current regulation mode.
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 or HV ON/OFF buttons or by toggling the HV enable signal. A switch located on the rear panel of the remote control chassis allows the selection of current limit or current trip operation.

Voltage monitor: 0 to 10 V equivalent to 0 to rated voltage. Accuracy, 0.5% of reading + 0.2% of rated. Impedance is 10 KΩ.

Current monitor: 0 to 10 V equivalent to 0 to rated current. Accuracy, 1% of reading + 0.05% of rated. Reverse polarity models: 1% of reading + 0.1% of rated. Impedance is 10 KΩ.

Stored Energy: Stored energy varies with output voltage and is tabulated in the models chart.

Ripple: Ripple consists of two major components, inverter switching frequency components and line frequency related components. The inverter frequency component is dependent on the amount of load current drawn. The line frequency related component is determined by the amount of power delivered to the load. The maximum values for both components are specified in the models chart.

Stability: 0.01% per hour after 1/2 hour warm-up, 0.05% per 8 hours.

Voltage Rise/Decay Time Constant: 400 ms typical using either the HV ON switch or remote programming with a minimum 2.7 mA resistive load.  Parallel systems require an additional 2.7 mA load per slave.

Temperature Coefficient: 0.01%/C.

Ambient Temperature: -20 to +40 C, operating, -40 to +85 C storage.

Protection: Automatic current regulation protects against all overloads, including arcs and short circuits. Thermal switches and RPM sensing fans protect against thermal overload. Fuses, surge-limiting resistors and low energy components provide ultimate protection.

Arc Quench: An arc quench feature provides sensing of each load arc and quickly inhibits the HV output for approximately 0.25 seconds after each arc.

Arc Sensing: Internal circuitry senses the number of arcs caused by external load discharges. If the rate of consecutive arcs exceeds approximately one arc per second for 5 arcs, the supply will turn off for approximately 5 seconds to allow clearance of the fault. After this period the supply will automatically return to the programmed kV value with the rise time constant indicated. If the load fault still exists the above cycle will repeat.

RS232/USB/Ethernet Programming and Monitor Accuracy:
Resolution: 0.025% of full scale for both the voltage and the current programs. 0.1% of full scale for both the voltage and the current monitors.
Remote setting accuracy: Voltage setting accuracy is better than 0.5% of setting + 0.2% of rated.
Remote reading accuracy: Voltage reading accuracy is 0.5% of reading + 0.2% of rated. Current reading accuracy is 1% of reading + 0.1% of rated.

Remote Control Unit: A separate control panel chassis is provided which contains all the control functions.

The front panel of this assembly contains: separate 10-turn controls with locking vernier dials used to set the voltage and current levels, High Voltage ON switch, High voltage OFF/Reset switch and an AC power on/off switch and indicator. LEDs indicate when the high voltage is on, output polarity, interlock status, fault status, and whether the supply is operating in a voltage or current regulating mode. Output levels are indicated by voltage and current digital meters.

The rear panel of this assembly contains: AC Power On indicator, ground stud, driver/control chassis interface connectors, current limit/current trip selector switch, remote user interface connector and RS232/USB connectors.

The signals provided on the remote user interface connector are as follows:

Inputs: Output voltage and current program signals, and high voltage enable.

Outputs: Output voltage and current monitor signals, a +10 V reference source, a high voltage status signal, fault status, and V/I mode status.
Signal common and ground reference terminals are also provided.

Remote HV Enable: 0 - 1.5 V = OFF, 2.5 - 15 V = ON.

External Interlock: Open = off, closed = on. Latching with reset via the HV ON switch. The front panel indicator is illuminated when the interlock is open. Interlock connections are provided on a terminal strip on the rear panel of the driver chassis.

Accessories: 25 feet of detachable interconnection cables, a 10 foot null modem cable, and a 10 foot USB cable are provided.


Symbol Description
ZR Zero start interlock. Voltage control, local or remote, must be at zero before HV will enable.
SS Slow start ramp. Specify standard times of 5, 10, 15, 20, or 30 seconds 20%.
5VC 0-5 V voltage and current program/monitor.
200 180-220 VRMS, 3 input, 48-63 Hz.
400 340-460 VRMS, 3 input, 48-63 Hz. (Required for CE compliance.)
ETH Virtual RS-232 COM port over Ethernet network. (Requires compatible OS (eg Windows) for COM drivers.)
Please consult factory for special requirements.


Click on the model number below to request a quote and for complete ordering part number.

4 kW, Open Stack

Max Stored
Energy (J)
High Freq.
Ripple (P-P)
Line Freq.
Ripple (P-P)
LH200P20 LH200N20 LH200R20 0-200 kV 0-20 mA 109 150 20
LH250P16 LH250N16 LH250R16 0-250 kV 0-16 mA 129 160 20
LH300P12.5 LH300N12.5 LH300R12.5 0-300 kV 0-12.5 mA 159 150 20
LH350P9 LH350N9 LH350R9 0-350 kV 0-9 mA 180 130 20
LH400P7 LH400N7 LH400R7 0-400 kV 0-7 mA 211 110 20
LH450P6 LH450N6 LH450R6 0-450 kV 0-6 mA 243 105 20
LH500P5 LH500N5 LH500R5 0-500 kV 0-5 mA 264 100 20

8 kW, Open Stack

Max Stored
Energy (J)
High Freq.
Ripple (P-P)
Line Freq.
Ripple (P-P)
LH200P40 LH200N40 LH200R40 0-200 kV 0-40 mA 218 150 20
LH250P32 LH250N32 LH250R32 0-250 kV 0-32 mA 258 160 20
LH300P25 LH300N25 LH300R25 0-300 kV 0-25 mA 318 150 20
LH350P18 LH350N18 LH350R18 0-350 kV 0-18 mA 360 130 20
LH400P14 LH400N14 LH400R14 0-400 kV 0-14 mA 422 110 20
LH450P12 LH450N12 LH450R12 0-450 kV 0-12 mA 486 105 20
LH500P10 LH500N10 LH500R10 0-500 kV 0-10 mA 528 100 20

For Models Greater Than 8 kW, Please Consult Factory.

Outline Drawings

High Voltage Stack Assembly

Driver Assembly

Driver Assembly - Slave

Remote Control Assembly

8 kW System