Four-Quadrant Fast Response
Bipolar Power Amplifier
- Output Voltage: 0 to ±45V
- output power: 240W
- Frequency bandwidth:
DC to 100kHz - DC bias
Compact High Speed Bipolar Amplifier
DHOP series is a four-quadrant bipolar amplifier which sources and sinks electric power. They can be used in 2-mode of a Constant Voltage (CV) or a Constant Current (CC). Thanks to the original design, a phenomenal lightweight and compact size power supply, which is 8.27 inches (210 mm) in width and weighs 7 kg, has been achieved.
These ultra-compact, high-speed amplifiers produce output signals proportional to various input waveforms, including sine, triangle, sawtooth, and square waves. The DHOP series is most appropriate for evaluation tests such as solar panels, instruments driven by a battery, and the IC that controls the battery.
Note: This product is not designed for charge and discharge of battery.
For battery charging and discharging applications, please refer to the Battery Cycle Tester product page.
FEATURES AND BENEFITS
- Response speed
- Newly developed DHOP series is the most appropriate for transient response tests with such high power and broad bandwidth.
- DC bias (DC offset voltage/current setting)
- The output DC bias can be adjusted with the 10-turn "BIAS" potentiometer on the front panel. When used as a DC power supply, it functions as an output setting volume. When an AC waveform is output, the DC (bias) voltage/current is superimposed on it.
- DC output meter
- A 3-digit digital meter displays the DC value of the output voltage and current.
- Compact & Lightweight
- For maximum compactness and lightweight, the DHOP series has been improved for a small footprint and easy carry.
- Constant Voltage (CV)/Constant Current (CC)
- 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 overvoltage/overcurrent and protective measures against output short-circuit are completely provided.
APPLICATIONS
- Suitable to evaluate battery-driven equipment to use as a simulated battery
- Inductive loads 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
Models
* Please consult with our sales office about the specifications except for the following list.
| Model | Maximum output | Frequency bandwidth (-3dB) | ||
|---|---|---|---|---|
| Voltage | Current | Power | ||
| DHOP20-12 | ±20 V | ±12 A | 240 W | CV mode: DC to 100 kHz CC mode: DC to 10 kHz |
| DHOP45-5 | ±45 V | ±5 A | 225 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)
DHOP series is equipped with overvoltage protection, which protects the load by limiting voltage up to approx 110% of the rated output voltage even at abnormal conditions.
Overcurrent Protection (OCP)
DHOP series is also equipped with overcurrent protection, which protects power supplies and load by limiting current up to approx 110% of the rated output current.
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: 2025-07-03 rev 14
PDF (1,129 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: 2025-07-03 rev 14
PDF (1,129 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.
