High Voltage Power Supply Model 8100

The  8100 high voltage power supply is a standard double-width NIM module that provides either polarity of output voltage from 10 to 3000 V, 0 to 10 mA. The 8100 provides the extremely stable, low-noise, high voltage that is required for proper bias of photomultiplier tubes, ionization chambers, and semiconductor detectors. Its accuracy and stability allow it to be used as a high voltage laboratory standard in applications requiring accuracy within ± 0.0025% of setting.




  • Output polarity: Positive or negative, selected by switch on rear panel.
  • Output range: 10 to 3000 V
  • Output load capacity: ≤ 0.0025% variation in output voltage at constant ambient temperature.
  • Temperature instability : ≤± 50 ppm/°C after 30 minute warm up
  • Long- term drift:< 0.01% hour and < 0.03%/24-hour variation in output voltage
  • Output ripple: peak-to-peak, 20 Hz to 20 MHz.
  • Overload protection: Internal circuitry protects against overloads including short circuit



  • Power: Front-panel toggle switch energizes unit when power cord is connected to appropriate source, and an adjacent red LED lamp indicates when power is applied.
  • Output voltage: By setting a 6 position switch, a 5 position switch and a 10-turn precision potentiometer are created.
  • Front panel toggle switch selects display of output voltage in KV or load current in mA.
  • Int: Selects the internal reference source; the front-panel controls select the output amplitude.
  • Ext: Selects the external reference source; output voltage is proportional to magnitude of reference input.



  • 206-258 V, 47-63Hz, 70 W nominal at full output power
  • Fuse rating: 0.75 A, 250 V fuse for 230 Vac operation.
  • External control: Full range of output voltage can be based on an external dc reference level furnished through a rear-panel BNC connector; control voltage range is 0 through ± 6.9 Vdc; control voltage be the same polarity as that selected by the rear-panel polarity switch; this input protected voltages above ± 7 V. Input impedance is 45 KΩ.



  • Regulated DC output
  • The adjusted and regulated voltage, with selected polarity, is furnished simultaneously to the two SHV connectors on the rear panel.



Meter: Front panel LCD display indicates output voltage in kV or ± 10 V load current in mA ± 10 μA


Electrical and Mechanical

  • Power requirements: 230 V ac, 47-63 Hz, 70 W nominally
  • Weight: Net 3.6 kg (8 lb) and shipping 4.5kg (10 lb).
  • Dimension: standard double –width NIM module


Related Equipment

Each of the two outputs of the 8100 can be as a power source for any application that is within the operating limits of the power supply. Both output levels are identical and of the same polarity. The load on the 8100 output circuit is the sum of the individual loads connected to the output connectors and the load current can be monitored by the front panel LCD meter.

This power supply is ideal for use with either a detector or a pair of detectors where the voltage level requirements are the same for both detectors. The appropriate types of detectors for which the 8100 is designed include photomultiplier tubes, ionization chambers, and semiconductor detectors.



The 8100 is normally used in conjunction with other modular electronics and may be installed in a standard NIM bin such as an 8000 H.V.

Connect Into A System

  • Check to see that the power switch in the off position.
  • The INT/EXT switch should be in INT mode.
  • Check the polarity switch on the rear panel and set it for either positive or negative output as required for the application.
  • Connect a high-voltage cable from either output connector on the 8100 to the instrument to be powered.
  • Set the front-panel selector switches and potentiometer for the desired voltage level. This is normally specified for the instruments to which the voltage is to be applied.
  • Turn on the power with the toggle switch on the front panel. The indicator lamp next to the switch will light to show that input power is being applied. The indicating meter at the top of the front panel will also indicate the polarity and amplitude of either the 8100 output voltage or load current, depending on the setting of the meter switch.


Reference Input

The 8100 output voltage level can be controlled by an external reference level that is furnished through the rear- panel BNC connector when the control locking toggle switch is set at Ext. The range of input voltage is 0 to 6.9 V to provide an output from 0 to 3000 V. The front-panel voltage level controls are ineffective for external reference operation.

For position output the polarity selector switch on the rear panel is set at POS and the external reference should be positive. For negative output the polarity switch is set at NEG and external reference should be negative. The external reference voltage should be stable and filtered. Since the output is linearly proportional to this reference. The external reference should be capable of driving the 45 KΩ input impedance.


Delivery Test

  • Power test
  • Match test the instrument output with detector output
  • Stability test
  • Spectroscopy test with DAS software


Installation Requirements 

  • Laboratory
  • A table for placing instrument
  • BNC cable
  • The equipped room with an air conditioning for constant temperature and humidity
  • Power
  • SHV cable


Long Term Warranty And After Sales Service

The warranty service includes the repair or service of the instrument and the free provision of services for replacing parts and repair wages for one year, but the warranty does not apply on the following cases:

  • Transport damages, electrical fluctuations, fire or heat, contact or penetration of water and corrosive chemicals, intense dust, lightning, natural disasters.
  • Instruments manipulated or repaired by persons other than the company’s representatives.
  • Any kind of manipulation or damage on installed holograms on the instrument.
  • Any displacement after installation without informing the company.
  • The warranty does not cover consumables.
  • After sales service is for 10 years with payment.

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