±500V, 1W, 12 Channel Precision HV Amplifier

high-voltage-amplifier - HAR12A

The precision high voltage amplifier HAR12A is a 19" rack-mountable unit of 3HU.

Twelve channels provide output voltages in the range of -500V to +500V at load current of ±2mA each. The channels consist of HA05B2 amplifier modules.

Each output voltage is controlled by a control voltage which can be either provided via its nominal value input or set by a 10-turn potentiometer. The control voltage ranges from -10V to +10V and 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 HAR12A well suited even for voltage reference applications.
Both the output voltage and the load current of each channel can be displayed simultaneously on two 4-digit red LED-displays. A rotary switch for channel selecting is provided.
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 output connectors are alternatively BNC connectors (HAR12 mainframe) or SHV connectors (HAR12S mainframe).


  • 12 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 Input: Amplifier On: -15V … +1.5V
Amplifier Off: +2.4V … +15V or open
Inhibit Response Time: Amplifier On->Off: < 10µs
Amplifier Off->On: ca. 2.5ms
Supply Voltage +24V: +20 … +28VDC, < 100mA
Supply Voltage +540V: +530 … +550VDC, < 4mA
Supply Voltage -540V: -530 … -550VDC, < 4mA
Power Bandwidth: > 500Hz
Slew Rate: > 2V/µs
Supply Voltage: 95 … 265VAC , 47 … 63Hz, 0.5ARMS @230VAC
Operating Temp.: 0°C … +40°C
Dimensions (WxHxD): 482 x 134 x 365mm3
Weight: 9.5kg


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!