FOUR-QUADRANT FAST RESPONSE BIPOLAR POWER AMPLIFIER
- Max Voltage: ±120V
- Max Power: 640 W
- DC to 10kHz or 15kHz
- Compact and lightweight
Suitable for the testing of coils and DC motors
The DOL series is a four-quadrant bipolar amplifier featuring fast response and high power output. They can be used in 2 modes: Constant Voltage (CV) and Constant Current (CC). The weight is half of the conventional units by adopting the aluminum frame.
In addition, DOL is particular about usability (for instance, "simple operation" and "quiet movement") thoroughly and is designed.
Note: This product is not designed for the charge and discharge of a battery.
For battery charging and discharging applications, please refer to the Battery Cycle Tester product page.
FEATURES AND BENEFITS
- Four-quadrant action
- DOL series can be used both as a high-speed response DC power supply and as a DC electronic load.
- Constant Voltage (CV)/Constant Current (CC)
- A single switch selects between CV and CC modes.
- High-speed response
- DOL series is suitable for transient response tests with enough output power and fast frequency response.
- Compact & Lightweight
- For maximum compactness and lightweight, the DOL series has been improved for a small footprint and easy carry.
- DC output meter
- A 3-digit digital meter displays the DC value of the output voltage and current. (The option of rms indication is available.)
- 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.
- Silent operation
- Operating noise became quiet by employing the silent fan, and it also became easy to use.
- Wide range of products
- Select a model fitting for your applications from our wide output voltage and current range.
- Useful protective function
- Protective function against overvoltage/overcurrent and protective measures against output short-circuit are completely provided.
APPLICATIONS
- Inductive loads such as coil and transformer
- Testing of various DC motors
- Evaluation test for in-vehicle electrical component
- Simulation of various batteries
- Evaluation test for solar-panel related devices
- Capacitive loads such as electric double-layer capacitor
- Surface treatment etc.
Models
| Model | Maximum output | Frequency response (-3 dB) | ||
|---|---|---|---|---|
| Voltage | Current | at CV mode | at CC mode | |
| DOL18-15 | ±18 V | ±15 A | DC to 15 kHz | DC to 10 kHz |
| DOL40-8 | ±40 V | ±8 A | DC to 15 kHz | DC to 10 kHz |
| DOL40-16 | ±40 V | ±16 A | DC to 10 kHz | DC to 10 kHz |
| DOL60-5 | ±60 V | ±5 A | DC to 15 kHz | DC to 10 kHz |
| DOL120-3 | ±120 V | ±3 A | DC to 15 kHz | DC to 10 kHz |
Functions
Protections
OverVoltage Protection (OVP)
DOL 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 to control of the output in 0 to approx 110% range.
OverCurrent Protection (OCP)
DOL 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 to control of the output in 0 to approx 110% range.
High speed overcurrent protection
DOL 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
DOL 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.
Specifications
- Input voltage
-
100 to 120 Vac, 50/60 Hz, Single-phase (270 to 360 W models)
200 to 240 Vac, 50/60 Hz, Single-phase (DOL40-16)
200 to 240 Vac, 50/60 Hz, Single-phase (270 to 360 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 approximately. 110% with front panel dial
- -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 approximately. 110% with front panel dial
- -L(220V)
-
200 Vac to 240 Vac ±10% single-phase
50 Hz/60 Hz input (270 W to 360 W models only)
The CABLE TYPE 5 AC input cable is included.
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
How to order option codes, and list them in alphabetical order, with the input voltage option placed at the end.
Example: DOL18-15-LCcNPrVc(220V)
Accessories
- Function Generator
-
- AC Input cable
-
Standard
up to 300 W modelCABLE TYPE2 
125V/15A Standard
more than 600 W model
-L(220V) optionCABLE TYPE5 
300V/25A
Dimensions
Tech Notes
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.
: at 15 kHz or lower, tr = tf = around 23 μs
: at 10 kHz or lower, tr = tf = around 35 μs
Response speed
When accurate output waveforms are required, select an amplifier with a frequency bandwidth higher than the operating frequency.
In case of using sine waves, 3 times to 5 times more frequency bandwidth is required, and around 10 times more in case of square waves in general.
Inadequate bandwidth causes not only 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.
Capacitative load
Capacitive load may cause oscillation.
In such cases, placed a power resistance in series with the output.
Be careful that the frequency bandwidth is limited depending on the resistance and capacitance placed in series when capacitative load.
Inductive load
Some inductance of the inductive load may cause resonance in CC mode.
In such cases, connect a C-R series circuit between output terminals to prevent resonance.
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-
DOL series Datasheet
Date: 2025-10-28 rev 11
PDF (2,458 KB)
-
Bipolar Power Supplies Selection Guide Via External Signal input
Date: 2025-06-30 rev 08
PDF (4,774 KB)
-
DOL series Instruction Manual
Date: 2023-10-18 rev 0.0
PDF (864 KB)
Login Required
-
DOL series Datasheet
Date: 2025-10-28 rev 11
PDF (2,458 KB)
-
Bipolar Power Supplies Selection Guide Via External Signal input
Date: 2025-06-30 rev 08
PDF (4,774 KB)
-
DOL series Instruction Manual
Date: 2023-10-18 rev 0.0
PDF (864 KB)
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