Four-Quadrant Fast Response
Bipolar Power Amplifier
- Output Voltage: 0 to ±60 V
- Output Power: 240 W
- Frequency Bandwidth:
DC to 100 kHz - DC Bias Function
Compact High-Speed Bipolar Amplifier
The DHOP series is a four-quadrant bipolar amplifier capable of sourcing and sinking current. It operates in both Constant Voltage (CV) and Constant Current (CC) modes. Thanks to its proprietary design, the series achieves a compact and lightweight form factor, weighing only 7 kg with a width of 8.27 inches (210 mm).
These ultra-compact, high-speed amplifiers generate output signals proportional to various input waveforms, including sine, triangle, sawtooth, and square waves. The DHOP series is ideal for evaluating solar panels, battery-powered instruments, and battery management ICs.
Note: This product is not designed for battery charging and discharging cycles.
For battery charging and discharging applications, please refer to the Battery Cycle Tester product page.
FEATURES AND BENEFITS
- Response Speed
- With high power and broad bandwidth, the DHOP series is ideal for transient response testing.
- DC Bias (DC Offset Voltage/Current Setting)
- The output DC bias can be adjusted using the 10-turn "BIAS" potentiometer on the front panel. When used as a DC power supply, it sets the output level. When outputting an AC waveform, the DC bias is superimposed on the signal.
- DC Output Meter
- A 3-digit digital meter displays the DC value of the output voltage and current.
- Compact & Lightweight
- The DHOP series is optimized for a small footprint and portability, making it easy to integrate into various systems.
- Constant Voltage (CV) / Constant Current (CC)
- A single switch allows easy selection between CV and CC modes.
- Four-Quadrant Operation
- The series functions as both a high-speed DC power supply and an electronic load.
- Full Protection Functions
- The system includes comprehensive protection against overvoltage and overcurrent, as well as safeguards against output short-circuits.
APPLICATIONS
- Battery simulation for evaluating battery-driven equipment
- Inductive loads such as coils and transformers
- Capacitive loads such as capacitors
- Various motor tests
- Voltage regulation tests for in-vehicle electrical components
- Evaluation of solar-panel related devices
- Surface treatment applications
Models
* Please consult with our sales office about the specifications except for the following list.
| Model | Maximum output | Frequency response (-3dB) | ||
|---|---|---|---|---|
| Voltage | Current | Power | ||
| DHOP20-12 | ±20 V | ±12 A | 240 W | CV mode: DC to 100 kHz CC mode: DC to 10 kHz |
| DHOP30-8 | ±30 V | ±8 A | 240 W | |
| DHOP45-5 | ±45 V | ±5 A | 225 W | |
| DHOP60-4 | ±60 V | ±4 A | 240 W | |
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  |
Rocker switch  |
Functions
Protections
Overvoltage Protection (OVP)
The DHOP series is equipped with overvoltage protection, which safeguards the load by limiting voltage to approximately 110% of the rated output, even under abnormal conditions.
Overcurrent Protection (OCP)
The series also features overcurrent protection, protecting both the power supply and the load by limiting current to approximately 110% of the rated output.
High speed overcurrent protection
DHOP series is provided with 2 types of overcurrent protection: high-speed overcurrent protection to limit the pulse current and standard overcurrent protection to limit the static current.
The standard overcurrent protection limits the static current, responding at around 1 ms. Additional high-speed overcurrent protection can limit the pulse current of square waveforms or from capacitors to approximately 2 times the rating.
Output range
DHOP series is a bipolar power supply that can perform the four-quadrant operation. They can supply (source) and absorb (sink) current in the field of the drawing on the right.
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." The 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 |
Specifications
- Input voltage
- 85 to 264 Vac, 50/60 Hz, Single-phase
- Output control
-
[External control signal] Vcon-in, Input voltage -10 to +10 V
[Front panel] DC bias: 10-turn potentiometer with -100% to +100% setting
Options
- -LD
-
Interlock
- -LN
-
Automatic output recovery (previous: no power failure protection)
This option retains the output state when recovering from an input power interruption, such as an AC power switch ON/OFF or a power failure. Therefore, there is no need to reset the protection status by turning off the OUTPUT switch once.
Caution: If you turn on the power while the OUTPUT setting is ON, the output will be ON.
- -LS
-
External output ON/OFF
How to Order
When placing an order, please add the option code(s) after the model name.
If adding two or more options, omit the “-L” from the second and subsequent option codes, and list them in alphabetical order.
Example: DHOP45-5-LDNS
Accessories
- Function Generator
-
- AC Input Cable
-
Standard CABLE TYPE1 
125 V/10 A 2.5 meters Fixed length
Sold separately CABLE TYPE3 
250 V/10 A 2.5 meters Fixed length
Sold separately CABLE TYPE4 
250 V/10 A 2.5 meters Fixed length
Dimensions
Download
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-
DHOP series Datasheet
Date: 2026-01-15 rev 16
PDF (1,713 KB)
-
Bipolar Power Supplies Selection Guide Via External Signal input
Date: 2025-06-30 rev 08
PDF (4,774 KB)
-
Bipolar Power Supplies/Amplifiers Selection Guide
Date: 2023-10-17 rev.03
PDF (6,310 KB)
-
DHOP series Instruction Manual
Date: 2020-05-26 rev0.3
PDF (437 KB)
-
DHOP series Outline Drawing (DXF, PDF)
Date: 2024-07-25
ZIP (364 KB)
Login Required
-
DHOP series Datasheet
Date: 2026-01-15 rev 16
PDF (1,713 KB)
-
Bipolar Power Supplies Selection Guide Via External Signal input
Date: 2025-06-30 rev 08
PDF (4,774 KB)
-
Bipolar Power Supplies/Amplifiers Selection Guide
Date: 2023-10-17 rev.03
PDF (6,310 KB)
-
DHOP series Instruction Manual
Date: 2020-05-26 rev0.3
PDF (437 KB)
-
DHOP series Outline Drawing (DXF, PDF)
Date: 2024-07-25
ZIP (364 KB)
On this website, we provide only the latest versions of information and instruction manuals for our products. Therefore, the newest versions of manuals on the website may differ from those that came with products you purchased in the past.
