COMPACT HIGH-SPEED BIPOLAR AMPLIFIER
- Voltage Range: ±10 V to ±60 V
- Power: 50 W, 60 W
- Frequency Bandwidth:
DC to 30 kHz - Light Weight:
3 kg
Four-Quadrant Fast Response Bipolar Amplifier
The DJOP 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. Its proprietary design achieves a compact and lightweight form factor, weighing just 3 kg with a width of 140 mm (5.51 inches). This ultra-compact, high-speed unit produces output proportional to input waveforms, including sine, triangle, sawtooth, and square waves. All models are fully solid-state with output voltages ranging from ±10 V to ±60 V. The DJOP series is ideal for evaluating solar panels, battery-driven instruments, and battery management ICs.
Even faster models, with function generator models and more high-power models, are available.
Contact the local sales office for details.
FEATURES AND BENEFITS
- Response speed
-
Newly developed DJOP series is the most appropriate for transient response tests with such high power and broad bandwidth.
- Four-quadrant action
-
The DJOP series can be used both as a high-speed response DC power supply and as an electronic load.
- DC bias setting (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
-
3-digit digital meter displays the DC value of the output voltage and current. (The option of rms indication is available.)
- Compact & Lightweight
-
For maximum compactness and lightweight, the DJOP 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.
- Wide range of products
-
Select a model fitting for your applications from our wide output voltage and current range.
- Full protection features
-
The series is fully equipped with protection functions against overvoltage and overcurrent, as well as output short-circuit protection.
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 | ||
|---|---|---|---|
| Voltage | Current | Power | |
| DJOP10-5 | ±10V | ±5A | 50W |
| DJOP20-3 | ±20V | ±3A | 60W |
| DJOP30-2 | ±30V | ±2A | 60W |
| DJOP60-1 | ±60V | ±1A | 60W |
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
|
For further information, please contact our sales representatives.
Functions
Protections
Overvoltage Protection (OVP)
DJOP 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)
DJOP 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
The DJOP series is provided with two 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 rated current.
Output range
The DJOP series is a bipolar power supply that can perform 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 voltage bias can be set when CV control is selected, and the current bias can be set 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 |
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 30kHz or lower, tr = tf = around 12 µs
Response speed
When accurate output waveforms are required, select an amplifier with a frequency bandwidth higher than the operating frequency.
In the case of using sine waves, three 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
When the capacitive load exceeds 100 pF (including stray capacitance of the output wire), output resonance may occur. In this case, insert a 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 using an amplifier with a capacitive load, as shown in the formula on the right.
In addition, using the amplifier for corona discharge may cause current exceeding the rating to flow, potentially damaging the amplifier. In this case, as well as when driving a capacitive load, please install an output resistor to limit the current.
* Please avoid continuous input of the high-frequency signal, which reduces the output frequency of an amplifier. An amplifier will break because of an increase in internal loss.
Specifications
- Input voltage
- 100 to 240 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
- -LN
-
Output state auto-recovery
This option retains the output state when recovering from an input power interruption, such as turning the AC power switch ON/OFF or a power failure. The output automatically returns to its previous state without needing to reset the protection status or cycle the OUTPUT switch.
Caution: If the power is turned on while the OUTPUT setting is ON, the output will immediately turn ON.
How to Order
When placing an order, please add the option code "-LN" after the model name.
Example: DJOP60-1-LN
Accessories
- AC Input Cable
-
Standard CABLE TYPE1 
125 V/10 A 2.5 meters
Fixed lengthSold separately CABLE TYPE3 
250 V/10 A 2.5 meters
Fixed lengthSold separately CABLE TYPE4 
250 V/10 A 2.5 meters
Fixed length
- Function Generator
-
Dimensions
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-
DJOP series Datasheet
Date: 2025-06-27 rev.17
PDF (1,079 KB)
-
Bipolar Power Supplies Selection Guide Via External Signal input
Date: 2025-06-30 rev 08
PDF (4,774 KB)
-
DJOP series Instruction Manual
Date: 2020-05-26 rev0.5
PDF (517 KB)
-
DJOP series Outline Drawing (DXF, PDF)
Date: 2024-07-29
ZIP (325 KB)
Login Required
-
DJOP series Datasheet
Date: 2025-06-27 rev.17
PDF (1,079 KB)
-
Bipolar Power Supplies Selection Guide Via External Signal input
Date: 2025-06-30 rev 08
PDF (4,774 KB)
-
DJOP series Instruction Manual
Date: 2020-05-26 rev0.5
PDF (517 KB)
-
DJOP series Outline Drawing (DXF, PDF)
Date: 2024-07-29
ZIP (325 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.
