±500V, 1W, 2 Channel Precision HV Amplifier

HAR2 / HAR2-W / high-voltage-amplifiers

The HAR2 is a mainframe to be equipped with 1 or 2 high precision high voltage amplifier modules HA05B2 (3U high, 6HP wide plug-in modules). The channels provide output voltages in the range of –500V to +500V at load current of ±2mA each. The following refers to a HAR2 mainframe equipped with HA05B2 HV amplifier modules.

The output voltage is controlled by a control voltage or set by a 10‑turn potentiometer. The control voltage ranges from –10V to +10V, the gain is 50.

Monitor outputs for voltage and current are provided on each channel.

Furthermore, each channel is equipped with a fast inhibit input effectively clamping the output voltage to 0V.

The amplifier channels feature high precision, very high stability and low noise, thereby making the HAR2 well suited even for voltage reference applications.

Both the output voltage and the load current of a selected channel can be displayed simultaneously on two 4-digit LED displays.

All amplifier outputs are protected against overload, short circuit and transient overvoltage.

High-Speed versions up to 15kHz bandwidth / 50V/µs slew rate are available on request.

The HAR2 is available as a table-top model (HAR2) or a wall mountable model (HAR2-W).


  • 2 Channels
  • Output ±500V
  • High Precision
  • High Stability
  • Low Noise
  • Remote On / Off
  • Monitor Outputs
  • Displays for Output Voltage and Current


  • Electrostatic deflection
  • HV Voltage Reference
  • Testing
  • Ion guidance


Output Voltage: -500V … +500V
Load Current: -2mA … +2mA
Gain: 50 ±0.2%
Temperature Coefficient: 5ppm/K (typ.)
Stability: < ±100ppm
Load Regulation: < 100ppm (no load / full load)
Ripple / Noise: ≤ 10mVPP / ≤ 1mVRMS
Digital Panel Meters: 4-digit red LED displays  [*]
Voltage Monitor: -10 … +10V / -500V … +500V ±0.2%
Current Monitor: -10 … +10V / -2mA … +2mA ±0.2%
Inhibit Response Time: Amplifier On->Off:  < 10µs
Amplifier Off->On:  ca. 2.5ms
Power Bandwidth: > 500Hz
Slew Rate: > 2V/µs
Supply Voltage: 22.8 … 25.2VDC ,  0.6ADC @24VDC  [*]
Operating Temperature: 0°C … +40°C  [*]
Dimensions HAR2 (WxHxD):

141 x 139 x 264mm3  [*]

Dimensions HAR2-W (WxHxD): 177 x 134 x 264mm3  [*]
Weight: 1.9kg  [*]
[*] refers to the mainframe, all other data refers to HA05B2 modules


The information given here is technical data, not assured product characteristics. It has been carefully checked and is believed to be accurate; however, no responsibility is assumed for inaccuracies. The user has to ensure by adequate tests that the product is suitable for his application regarding safety and technical aspects.
hivolt.de GmbH & Co. KG does not assume any liability arising out of the application or use of any product described.

Safety Advice

Design, installation and inspection of machinery and devices carrying high voltage require accordingly trained and qualified personnel. Appropriate safety rules and directives must be complied with.
Improper handling of high voltage can mean severe injuries or death and may cause serious collateral damage!