• DHOP series
  • DHOP series

DHOP series

Four-quadrant Fast Response
Bipolar Power Supply

  • Max Output Voltage:
    ±10V to ±45V
  • Max output power: 240W
  • Frequency bandwidth:
    DC to 100kHz
  • DC bias

Four-quadrant bipolar power supplies which source and sink electric power

DHOP series are four-quadrant bipolar power supplies which source and sink electric power. They can be used in 2-mode of a CV (constant voltage) or a CV (constant current). Thanks to the original design, phenomenal light weight and compact size power supply, which is 8.3" (210 mm) width, and weigh 7 kg has been achieved. They are ultra compact and high speed, driving output proportional to the input waveform such as a sine wave, triangular wave, saw wave, and square wave.
DHOP series is most appropriate for evaluation test such as solar panels, the instruments driven by battery and the IC which control battery.

Even faster model, DOS series, amplifier with function generator, DOPF series, or more high power model, DOP series, are available. Contact to local sales office for details.

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


Response speed
Newly developed DHOP series is the most appropriate for transient response test with such high power and broad bandwidth.
DC bias
10-turn potentiometer to be used for the output setting volume when used as the DC power supply and for the bias setting when used as AC power suppluy is equipped.
DC output meter
3-digit digital meter displays the DC value of the output voltage and current.
Compact & light weight
For maximum compactness and light weight, DHOP Series has been improved for small footprint and easy carry.
CV (constant voltage)/CV (constant current)
A single switch selects between CV and CC modes.
Four-quadrant action
DHOP series can be used both as a high speed response DC power supply and as an electronic load.
Complete protective function
Protective function against over voltage/current and protective measures against output short-circuit are completely provided.


  • Suitable to evaluate battery driven equipment to use as a simulated battery
  • Inductive load such as coil and transformer
  • Capacitive load like capacitor
  • Various motor tests
  • Voltage regulation tests for in-vehicle electrical component
  • Evaluation test for solar panel related devices
  • For surface treatment

This product is not designed for charge and discharge of battery. Please contact nearby sales if unit is used for charge and discharge application.


* Please consult with our sales office about the specifications except the following list.

Model Maximum output Frequency bandwidth
[kHz] (-3dB)
Voltage [V] Current [A] Power [W]
DHOP20-12 ±20 ±12 240 CV mode: DC to 100
CC mode: DC to 10
DHOP45-5 ±45 ±5 225



OVP (Over voltage protection)

DHOP series is equipped with over voltage protection, which protects load by limiting voltage up to approx. 110% of the rated output voltage even at abnormal conditions.

OCP (Over current protection)

DHOP series is also equipped with over current protection, which protects power supplies and load by limiting current up to approx. 110% of the rated output current.

High speed over current protection

DHOP series is provided with 2 types of over current protections, high speed over current protection to limit the pulse current, and standard over current protection to limit the static current.
The standard over current protection limits the static current, responding at around 1ms. Additional high speed over current protection can limit pulse current of square waveforms or from capacitor at approx. 2 times more current of rating.

High speed over current protection

Output range

DHOP series is a bipolar power supply which can perform four-quadrant operation. They can supply (source) and absorb (sink) current in the field of the drawing on the right.

  • Vo max: rated output voltage
  • Io max: rated output current

CV/CC setting selection

Inputting voltage via Vcon-in enables the control of output voltage V when CV control is selected and output current A when CC control is selected.

In CV mode In CC mode
Vcon Output voltage Output current
-10 V -Rating -Rating
0 V 0 V 0 A
+10 V +Rating +Rating

Use of BIAS

When the "BIAS ON/OFF switch" is flipped to ON, bias can be changed with the "BIAS setting dial." Bias of the voltage can be set when CV control is selected, and that of the current can be when CC control is selected.

In CV mode In CC mode
Scale Output voltage Output current
000 (ccw) -Rating -Rating
500 0 V 0 A
1000 (cw) +Rating +Rating



inch (mm)


Front panel


Rear panel


Rear panel
  1. POWER ON/OFF switch
  2. OUTPUT ON/OFF switch
  3. Vcon-in terminal
  4. Output voltage meter
  5. Bias ON/OFF switch
  6. Output current meter
  7. CV/CC select switch
  8. Bias setting dial
  9. Voltage/Current limitation setting VR
  10. Control connector
  11. Output terminal
  12. AC input terminal


For details, download the datasheet below.


-LD: Interrock

-LN: No protection against blackout

-LS: Remote switch (Output ON/OFF)

How to Order

When ordering, suffix the following option mark to the model number.
(Alphabetical order)


AC input cable

125 V/10 A
  • CABLE TYPE 1 Power Input End
  • CABLE TYPE 1 Input Plug
Sold separately
250 V/10 A
  • CABLE TYPE 3 Power Input End
  • CABLE TYPE 3 Input Plug
Sold separately
250 V/10 A
  • CABLE TYPE 4 Power Input End
  • CABLE TYPE 4 Input Plug


For details, download the datasheet below.

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.

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


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Bipolar power supplies/High voltage Amplifiers