FOUR-QUADRANT FAST RESPONSE BIPOLAR AMPLIFIER
High speed bipolar amplifier
- Voltage range: ±5 to ±300 V
- Current: ±1 to ±120 A
- Power: 150 to 2000 W
- Broad bandwidth:
DC to 30 kHz
Expandable up to 6 kW with master/slave connection
The DOP series is a high-speed, four-quadrant bipolar power supply designed for high-power applications. It operates in both Constant Voltage (CV) and Constant Current (CC) modes. By adopting an aluminum chassis, the unit achieves a lightweight design, weighing approximately half as much as conventional models.
These compact, high-speed amplifiers generate output signals proportional to various input waveforms, including sine, triangular, sawtooth, and square waves.
The DOP series is ideal for driving inductive loads (coils and transformers) and capacitive loads (capacitors), as well as for testing DC servo motors, automotive electrical components, and surface treatment applications.
All models are fully solid-state, with output voltages ranging from ±5 V to ±300 V.
Note: This product is not designed for battery charging and discharging cycles.
For battery charge/discharge applications, please refer to the Battery Cycle Tester product page.
FEATURES AND BENEFITS
- High-Speed Response
- With high power and broad bandwidth, the DOP series is ideal for transient response testing.
- Wide Range of Models
- Select the optimal model for your application from our extensive lineup of voltage and current configurations.
- DC bias setting (DC offset voltage/current setting)
- The output DC bias can be adjusted using the 10-turn "BIAS" potentiometer on the front panel. This function allows for offset adjustment in DC power supply mode or superimposing DC bias onto AC waveforms.
- Quiet Operation
- Equipped with a silent fan, the unit operates quietly, ensuring a comfortable work environment.
- DC Output Meter
- A 3-digit digital meter displays the DC output voltage and current values. (An RMS display option is also available.)
- Four-Quadrant Operation
- The DOP series functions as both a high-speed response DC power supply (source) and an electronic load (sink).
- CV/CC Modes
- Easily switch between Constant Voltage (CV) and Constant Current (CC) modes via a single switch.
- Compact & Lightweight
- Optimized for portability and space efficiency, the DOP series features a small footprint and lightweight design.
- Comprehensive Protection
- The series is fully equipped with protection against overvoltage, overcurrent, and output short-circuits to ensure safety and reliability.
- Master/Slave Control
- Optional master-slave control allows for power expansion to meet higher power requirements.
APPLICATIONS
- Inductive load such as coil and transformer
- Capacitive load such as electric double-layer capacitor
- Voltage regulation tests for in-vehicle electrical component
- Evaluation test for solar-panel related devices
- Various motor tests
- For surface treatment
Models
* Models with voltage, current, or frequencies not listed here are also available. Please contact the nearest sales office.
| Model | Maximum output | Frequency response (-3 dB) | ||
|---|---|---|---|---|
| Voltage | Current | Power | ||
| DOP5-30 | ±5 V | ±30 A | 150 W | DC to 20 kHz |
| DOP5-60 | ±60 A | 300 W | DC to 20 kHz | |
| DOP6-120 | ±6 V | ±120 A | 720 W | DC to 20 kHz |
| DOP10-15 | ±10 V | ±15 A | 150 W | DC to 20 kHz |
| DOP10-30 | ±30 A | 300 W | DC to 20 kHz | |
| DOP10-60 | ±60 A | 600 W | DC to 20 kHz | |
| DOP20-7.5 | ±20 V | ±7.5 A | 150 W | DC to 20 kHz |
| DOP20-15 | ±15 A | 300 W | DC to 20 kHz | |
| DOP20-30 | ±30 A | 600 W | DC to 20 kHz | |
| DOP20-60 | ±60 A | 1200 W | DC to 20 kHz | |
| DOP20-100 | ±100 A | 2000 W | DC to 20 kHz | |
| DOP25-6 | ±25 V | ±6 A | 150 W | DC to 30 kHz |
| DOP25-12 | ±12 A | 300 W | DC to 30 kHz | |
| DOP25-24 | ±24 A | 600 W | DC to 20 kHz | |
| DOP25-48 | ±48 A | 1200 W | DC to 20 kHz | |
| DOP25-80 | ±80 A | 2000 W | DC to 20 kHz | |
| DOP30-40 | ±30 V | ±40 A | 1200 W | DC to 20kHz |
| DOP45-3.3 | ±45 V | ±3.3 A | 150 W | DC to 20 kHz |
| DOP45-6.6 | ±6.6 A | 300 W | DC to 20 kHz | |
| DOP45-13.3 | ±13.3 A | 600 W | DC to 20 kHz | |
| DOP45-16 | ±16 A | 720 W | DC to 20 kHz | |
| DOP45-26.7 | ±26.7 A | 1200 W | DC to 20 kHz | |
| DOP45-44.4 | ±44.4 A | 2000 W | DC to 20 kHz | |
| DOP60-2.5 | ±60 V | ±2.5 A | 150 W | DC to 20 kHz |
| DOP60-5 | ±5 A | 300 W | DC to 20kHz | |
| DOP60-10 | ±10 A | 600 W | DC to 20 kHz | |
| DOP60-20 | ±20 A | 1200 W | DC to 20 kHz | |
| DOP60-33.3 | ±33.3 A | 2000 W | DC to 20 kHz | |
| DOP70-17 | ±70 V | ±17 A | 1200 W | DC to 20 kHz |
| DOP80-25 | ±80 V | ±25 A | 2000 W | DC to 20kHz |
| DOP120-2.5 | ±120 V | ±2.5 A | 300 W | DC to 20 kHz |
| DOP120-5 | ±5 A | 600 W | DC to 20 kHz | |
| DOP120-10 | ±10 A | 1200 W | DC to 20 kHz | |
| DOP150-2 | ±150 V | ±2 A | 300 W | DC to 20kHz |
| DOP150-4 | ±4 A | 600 W | DC to 20 kHz | |
| DOP150-8 | ±8 A | 1200 W | DC to 20 kHz | |
| DOP200-1.5 | ±200 V | ±1.5 A | 300 W | DC to 20 kHz |
| DOP200-1.75 | ±1.75 A | 350 W | DC to 20 kHz | |
| DOP200-3 | ±3 A | 600 W | DC to 20 kHz | |
| DOP200-3.5 | ±3.5 A | 700 W | DC to 20 kHz | |
| DOP200-6 | ±6 A | 1200 W | DC to 20 kHz | |
| DOP300-1 | ±300 | ±1 A | 300 W | DC to 20 kHz |
| DOP300-2 | ±2 A | 600 W | DC to 20 kHz | |
| DOP300-4 | ±4 A | 1200 W | DC to 20 kHz | |
Functions
Protections
Overvoltage Protection (OVP)
DOP 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.
* -LVc option (output voltage limiter) enables control of the output in 0 to approx 110% range.
Overcurrent Protection (OCP)
DOP 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.
* -LCc option (output current limiter) enables control of the output in 0 to approx 110% range.
High speed overcurrent protection
DOP series is provided with 2 types of overcurrent protections: 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
DOP series is a bipolar power supply that can perform four-quadrant operations. 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." 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
-
100 to 120 Vac, 50/60 Hz, Single-phase (150/300/350 W models)
200 to 240 Vac, 50/60 Hz, Single-phase (600/700/720/1200/2000 W models)
200 to 240 Vac, 50/60 Hz, Single-phase (150/300/350 W models option) - 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
- -LCc
-
Output current limit
Variable from 0 to approx 110% with front panel dial
- -LF
-
Floating ground (withstand voltage 200 Vdc)
- -LMsm: Master machine for master-slave control
-LMss: Slave machine for master-slave control -
By connecting a master machine and a slave machine with dedicated control lines, the master machine can control all slave machines at once. Parallel connection can increase the current that is insufficient for a single operation. Up to three units in total can be connected: one master unit and up to two slave units.
Note: Precautions for using the master-slave operation- Only the master-slave connection is available for the same model.
- In parallel operation, the frequency range is narrower.
- It can also operate on a single.
- Factory adjustment is required when changing the master-slave combination.
- -LN
-
Output state auto-recovery (former: 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.
- -LPr
-
rms display
- -LVc
-
Output voltage limit
Variable from 0 to approx 110% with front panel dial
- -L(220V)
-
200 Vac to 240 Vac ±10% single-phase, 50 Hz/60 Hz input
(150 W models and 300 W to 350 W models only)
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, with the input voltage option placed at the end.
<Example> DOP25-12-LCcFMsmNPrVc(220V)
Accessories
- Function Generator
-
Dimensions
Tech Notes
Characteristic of amplifier
Rise time
(Stepping time): The response time is sometimes described by the rise time (as shown in the drawing on the right).
The rise time of an amplifier at a response speed of (= frequency bandwidth)
Fc (Hz) is generally acquired by "tr ≒ 0.35/fc."
Fall time tf is the same as tr.
Frequency bandwidth
: at 30 kHz or lower, tr = tf = around 12 μs
: at 20 kHz or lower, tr = tf = around 18 μs
Response speed
When accurate output waveforms are required, select an amplifier with a frequency bandwidth higher enough than the operating frequency. In the case of using sine waves, 3 times to 5 times more frequency bandwidth is required, and around 10 times more in the case of square waves in general. Inadequate bandwidth causes not only a decrease in the output amplitude but much difference between the input and output phases. Therefore, operating the product while monitoring the actual output waveforms is recommended.
Inductive load
Some inductance of inductive load may cause resonance in CC mode.
In such cases, connect a C-R series circuit between output terminals to prevent resonance.
Capacitive Load
If the capacitive load exceeds 100 pF (including stray capacitance of the output wire), output resonance may occur. To prevent this, connect a high-voltage resistor of 100 Ω (at 0.1 μF) to 1000 Ω (at 1000 pF) in series with the output. Please note that the frequency bandwidth is limited when driving capacitive loads, as determined by the formula shown in the figure.
Additionally, using the amplifier for corona discharge applications may cause current spikes exceeding the rating, which can adversely affect the amplifier. In such cases, as with capacitive loads, please install an output limiting resistor to control the current.
* Avoid continuous input of high-frequency signals that exceed the amplifier's output capability. Excessive internal loss may result in damage to the unit.
Download
If you are unable to download a file
Please try the following solution.
- Please press Ctrl+F5 to clear the cache of your web browser and try again.
- Please restart your web browser and log in again to try again.
- Please change your web browser to another browser and try again.
- Restart the computer and try again.
- Please try again on a different computer.
-
DOP series Datasheet
Date: 2025-10-22 rev 24
PDF (3,328 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)
-
DOP series Instruction Manual
Date: 2023-4-11 rev.3.6
PDF (1,270 KB)
-
DOP series Outline Drawing (DXF, PDF)
Date: 2024-07-29
ZIP (2,515 KB)
Login Required
-
DOP series Datasheet
Date: 2025-10-22 rev 24
PDF (3,328 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)
-
DOP series Instruction Manual
Date: 2023-4-11 rev.3.6
PDF (1,270 KB)
-
DOP series Outline Drawing (DXF, PDF)
Date: 2024-07-29
ZIP (2,515 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.
