• AMJ series
  • AMJ series
  • AMJ series
  • AMJ series
  • AMJ series
  • AMJ series

AMJ series

Ultra Compact and High Speed High Voltage Amplifier

  • Max Voltage:
    ±500V to ±4000V
  • Max Current:
    10mA to 80mA
  • Max Power:
    20W to 40W
  • Frequency Response:
    DC to 75kHz

Ultra Compact and Fast Responce High Voltage Amplifier

AMJ series is a rack mountable type, fast response high voltage operational amplifier. It provide high voltage and fast response as high as 75 kHz according to its input waveforms including Sine, Triangle, Saw Tooth, Square, and more. All models are all solid state power supplies. Output voltage ranges are from ±500 V to ±4 kV.

Notice of POWER switch changes

We inform you of the power switch changes on the front panel as in the diagram below for shipment from June, 2020.

Before After
Push button switch
Push button switch
Rocker switch
Rocker switch

For further information, please contact our sales representatives.

Features and Benefits

  • Ultra compact
  • High speed response 75 kHz max
  • Various types of output waveforms according to the input wave
  • DC bias function
  • DC output voltage monitor (3.5-digit digital meter)


  • Beam deflection
  • Electrophotography process
  • Corona discharge
  • Electrorheological fluid
  • Breakdown voltage testing


Model Output Slew Rate Frequency Response
Voltage [kVdc] Current [mA] Power [W]
AMJ-0.5B40 ±0.5 ±40 20 150 V/µs DC to 75 kHz
AMJ-0.5B80 ±0.5 ±80 40
AMJ-1B20 ±1 ±20 20 DC to 40 kHz
AMJ-1B40 ±1 ±40 40
AMJ-1.5B20 ±1.5 ±20 25 DC to 25 kHz
AMJ-2B10 ±2 ±10 20 DC to 18 kHz
AMJ-2B20 ±2 ±20 40
AMJ-4B10 ±4 ±10 40 DC to 9 kHz


For details, download the datasheet below.


-LCs: Over current protection setting function

Over current protection setting function The over current value is set by external voltage +0.5 to +10.5 Vdc. When this option is chosen, please be sure to output, where external voltage is impressed to AMJ.


The length of HV output non-shielded cable is changed into 5 m to 1.5 m of a standard.

-L1: Output current monitor

Output voltage: -10 to +10 Vdc from BNC terminal on the front panel
The Output impedance is 1 kΩ with up to 2 kHz of bandwidth.

How to Order

When ordering, add Option No. in the following order by input voltage, and output cable length to Model No.



For details, download the datasheet below.


Input cable

100 V
  • CABLE TYPE 1 Power Input End
  • CABLE TYPE 1 Input Plug
3-pin plug (Type-A)/Inlet type/100 V input/Single phase (3-core)/Black
Sold separately (usable at 200 V input)
250 V
  • CABLE TYPE 3 Power Input End
  • CABLE TYPE 3 Input Plug
Flying lead/Inlet type/Single phase (3-core)/Black

The length of each cable is 2.5 m. (See CABLE series datasheet for details.)

Output cable

HV output cable 1.5 m
CN-40-AHVP output cable
Only for -L(5m) option
HV output cable 5 m
CN-40-AHVP(5) output cable

Tech Notes

Capacitive Load

When a capacitive load is more than 100 pF (including a stray capacitance of output wire), the resonance in the output may occur. In that case, install 100-ohm (@0.1 μF) to 1000-ohm (@1000 pF) of high voltage resistance in the output in series. Please note that the frequency band will be limited as the formula written in the right figure when an amplifier is used with a capacitive load.
In addition, when an amplifier is used for the use such as a corona discharge, the current which is higher than rating will flow and it will affect the amplifier badly. In this case, as well as the time to use an amplifier with a capacitive load, please install the output resistance and limit the current.

* Please avoid continuous inputting of high frequency signal which reduces output frequency of an amplifier. An amplifier will be broken because of increase of internal loss.

This image explains frequency band when a capacitive load is connected.

Read more


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Bipolar power supplies/High voltage Amplifiers