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  • DOL series | Bipolar power supply (Low Voltage Amplifiers) | Matsusada Precision
  • DOL series | Bipolar power supply (Low Voltage Amplifiers) | Matsusada Precision

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

DOL series is a four-quadrant bipolar power amplifier which source and sink electric power. They can be used in 2 modes of a constant voltage (CV) or a 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 charge and discharge of 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 test 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
3-digit digital meter displays the DC value of the output voltage and current. (The option of rms indication is available.)
DC bias
10-turn potentiometer to be used for the output setting volume when used as the DC power supply and for the bias setting when used as AC power supply is equipped.
Silent operation
Operating noise became quiet by having employed the silent fan, and also it became easy-to-use.
Wide range of products
Select a model fitting for your applications from our wide range of output voltage and current.
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 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 capacitor at approx. 2 times more current of rating.

The standard overcurrent protection limits the static current, responding at around 1ms.

Output range

DOL series is a bipolar power supply which can perform four quadrant operation. They can supply (source) and absorb (sink) current in the field of the drawing on the right.

Output range

Specifications

For details, download the datasheet below.

Options

-LCc

Output current limit
Variable from 0 to approx. 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 approx. 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)

How to Order

When ordering, add Option No. in the following order by alphabet and input How to order voltage to Model No.
Example: DOL18-15-LCcNPrVc(220V)

Accessories

Function Generator

Dimensions

For details, download the datasheet below.

Tech Notes

Capacitive Load

When a capacitive load is more than 100 pF (including a stray capacitance of output wire), the resonance in the output may occur. In that case, install 100-ohm (@0.1 μF) to 1000-ohm (@1000 pF) of high voltage resistance in the output in series. Please note that the frequency band will be limited as the formula written in the right figure when an amplifier is used with a capacitive load.
In addition, when an amplifier is used for the use such as a corona discharge, the current which is higher than the rating will flow and it will affect the amplifier badly. In this case, as well as the time to use an amplifier with a capacitive load, please install the output resistance and limit the current.

* Please avoid continuous inputting of the high-frequency signals which reduce the output frequency of an amplifier. An amplifier will be broken because of an increase of internal loss.

This image explains frequency band when a capacitive load is connected.

Read more

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