• DOSF series
  • DOSF series

DOSF series

Ultra High Speed Bipolar Power Supply

Ultra fast response Four-quadrant bipolar power supply with function generator

DOSF series is equipped with a built-in function generator enabling its compact size and ultra fast response. Any waveform can be programmed easily from the front panel, and it features memory setting and protection functions. With communication options, external control is available. The DOSF series can be used as an ultra high-speed bipolar amplifier enabling the an external signal input.

Features and Benefits

  • Ultra fast response of DC to 200 kHz
  • Function generator as standard
  • Waveform with less distortion by DDS method (DC to 200 kHz sinewave, square wave and triangular wave)
  • Individual setting of DC/AC output and CV/CC mode, making the unit user-friendly with simple operability (DC to 200 kHz in CV mode and DC to 100 kHz in CC mode for sine wave, square wave, and triangular wave)
  • External control with communication options (USB, LAN, RS-232C, RS-485, and GPIB)
  • High legibility with LCD display using high contrast white LED backlight
Four-quadrant operation
  • Vo max: rated output voltage
  • Io max: rated output current
This image is graph.legend
External control using communication options graph of External control using communication options

Main applications

Driving capacitive load (capacitors), biasing inductive loads (coils, transformers, etc.), various motor testing, power conditioners, evaluation test for solar panel related devices

Models

* Consult with our sales of fice about different specifications from the following list.

Model Output Frequency response [kHz] (-3 dB)
Voltage [V] Current [A] Power [W] CV mode CC mode
DOSF20-7.5 ±20 ±7.5 150 DC to 200 DC to 100
DOSF20-15 ±20 ±15 300 DC to 200 DC to 100
DOSF20-30 ±20 ±30 600 DC to 200 DC to 100
DOSF20-60 ±20 ±60 1200 DC to 200 DC to 100
DOSF20-100 ±20 ±100 2000 DC to 200 DC to 100
DOSF25-6 ±25 ±6 150 DC to 200 DC to 100
DOSF25-12 ±25 ±12 300 DC to 200 DC to 100
DOSF25-24 ±25 ±24 600 DC to 200 DC to 100
DOSF25-48 ±25 ±48 1200 DC to 200 DC to 100
DOSF25-80 ±25 ±80 2000 DC to 200 DC to 100
DOSF45-3.3 ±45 ±3.3 150 DC to 200 DC to 100
DOSF45-6.6 ±45 ±6.6 300 DC to 200 DC to 100
DOSF45-13.3 ±45 ±13.3 600 DC to 200 DC to 100
DOSF45-16 ±45 ±16 720 DC to 200 DC to 100
DOSF45-26.7 ±45 ±26.7 1200 DC to 200 DC to 100
DOSF45-44.4 ±45 ±44.4 2000 DC to 200 DC to 100
DOSF60-2.5 ±60 ±2.5 150 DC to 200 DC to 100
DOSF60-5 ±60 ±5 300 DC to 200 DC to 100
DOSF60-10 ±60 ±10 600 DC to 200 DC to 100
DOSF60-20 ±60 ±20 1200 DC to 200 DC to 100
DOSF60-33.3 ±60 ±33.3 2000 DC to 200 DC to 100

Functions

Basic wave generation

DOSF is equipped with a built in function generator that produces basic waves such as sine, rectangular and triangle waves. Frequency range can be set between 1 Hz and 200 kHz. You can adjust amplitude; starting phase (for sine wave), switching/cutoff phase (for sine wave), and duty ratio (for rectangular/triange wave).

Starting phase graph of initial phase
Switching phase graph of switching phase
Interruption phase graph of cutoff phase

Application

Power activation test, Inrush current measurement, waveform fluctuation test

Sequence functions *

The DOSF series is equipped with programmable sequence functions such as step length, step amplitude ramp, ramp, CV/CC mode, frequency sweep, AC superposition, step jump, and jump times. These useful functions help to program the desired waves in very flexible manner, enabling to support efficient laboratory and research works.

  • Setting length: 10 ms to 1999 s 999 ms (resolution: 1 ms), ramp and AC waveform is 50 ms
  • Up to 16 steps can be set and saved plus three programs per program.
  • Can be set CV/CC mode per program
  • Frequency: Infinite, 1 to 999
Program image
Program image

Sequence functions help to create complicated waves like below to be simply and easily edited.

Pulse current variation Pulse current variation
Ripple current superposition Ripple current superposition
AC voltage fluctuation AC voltage/ frequency variation
DC voltage interruption DC voltage interruption

Applications

Testing of motors, pulse power supply and various evaluation

* If amplifier's output cuts off while it is running a sequence program half-way-through, the leftover sequence will not run but it is re-activated from the beginning of the original sequence.

Measurement functions

The DOSF series is equipped with programmable sequence functions such as step length, step amplitude ramp, ramp, CV/CC mode, frequency sweep, AC superposition, step jump, and jump times. These useful functions help to program the desired waves in very flexible manner, enabling to support efficient laboratory and research works.

ex) measure AC waveform

Measurement functions

ex) measure DC+AC waveform

Measurement functions

Memory functions

During fundamental wave operation, output voltage (in CV mode), output current (in CC mode), CV/CC setting, and waveform settings can be saved in 10 set-up memories.

As sequence programs can be saved in up to three, it is useful when using frequently used multiple waveforms or sequence operations.

Other functions:
DOSF is equipped with a Protection function, Key-lock function, and CV/CC switching, as standard options.

Specifications

For details, download the datasheet below.

Options

* Selecting each individual option simultaneous in -LUs1, -LEt, and -LGob is not allowed.

-LD: Interlock

-LEt: LAN interface board *

Enable digital control via LAN

Control items

Output ON/OFF, Voltage/Current setting (AC and DC), Switch of Constant Voltage/Constant Current, Frequency setting, Waveform setting (sine wave, square wave, and triangular wave), phase setting (sine wave), Duty setting (square wave and triangular wave)

-LF: Floating ground (Withstanding voltage of 200 Vdc)

The negative terminal of the output can be floatable up to 200 V. However, please take note that external control signal source (such as function wave generator) and the common for the measuring device that connects to amplifier's monitor terminal will also become floating potential in this case.

-LGob: Optical interface board *

With optical communication, isolation control is performed. As complete isolation is performed by means of optical fiber, this enables advance prevention of erroneous operation involved with transient phenomenon caused by surges, inductive lightning, external noise, etc.

  • -LGob: Optical interface board + optical cable 2 m
  • -LGob(Fc5): Optical interface board + optical cable 5 m
  • -LGob(Fc10): Optical interface board + optical cable 10 m
  • -LGob(Fc20): Optical interface board + optical cable 20 m
  • -LGob(Fc40): Optical interface board + optical cable 40 m

When using the power supply under the following conditions, please select the -LGob option.

  • Noisy environment including factories
    (Example: Motors or coils are used near power supplies and loads)
  • Using with high voltage floating (more than 250 V)
  • The installation distance between power supply and controller (PL or PLC) produced by Matsusada Precision is more than two meters.

Control items

Output ON/OFF, Voltage/Current setting (AC and DC), Switch of Constant Voltage/Constant Current, Frequency setting, Waveform setting (sine wave, square wave, and triangular wave), phase setting(sine wave), Duty setting(square wave and triangular wave)

Adapters (separately sold)

An adapter is required separately, when using the Adapter. The following adapters are available according to the connection method between PC and sequencer.

CO-E32: Adapter for LAN
Total 32 units can be connected to one CO-E32.
LAN cable is not provided.
CO-E32
USB-OPT: Adapter for USB
Total 32 units can be connected to one USB-OPT.
USB cable is not provided.
CO-U32
CO-OPT2-9: Adapter for RS-232C (9 pin)
Total 32 units can be connected to each CO-OPT2-9.
CO-OPT2-9
CO-OPT2-25: Adapter for RS-232C (25 pin)
Total 32 units can be connected to each CO-OPT2-25.
CO-OPT2-25
CO-OPT4-25: Adapter for RS-485 (25 pin)
Total 32 units can be connected to each CO-OPT4-25.
CO-OPT4-25
CO-G32: Adapter for GPIB
Total 32 units can be connected to one CO-G32.
GPIB cable is not provided.
CO-G32

For details, refer to CO/USB series datasheet.

-LGob Optical Interface Board

-LMsm, -LMss: Master-slave control

"-LMsm" for Master unit, or "-LMss" for slave unit. Master unit or slave unit are to be set at the factory, and if master to slave change is required after shipment, adjustment at the factory will be needed. Maximum three units including master unit can be connected.

-LS: Remote switch (output ON/OFF)

-LUs1: USB interface board *

Enable digital control via USB

Control items

Output ON/OFF, Voltage/Current setting (AC and DC), Switch of Constant Voltage/Constant Current, Frequency setting, Waveform setting (sine wave, square wave, and triangular wave), phase setting (sine wave), Duty setting (square wave and triangular wave)

-L(220V): Changing the input voltage

200 Vac to 240 Vac ±10% single phase, 50/60 Hz input (150 W and 300 W models only)

How to order

When ordering, add option No. to the Model No.
Example:
DOSF60-20-LDFMsLMsmSUs1
DOSF20-100-LDFGob(FC20)LMssS
(Interface and input voltage order)

Dimensions

For details, download the datasheet below.

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 200 kHz or lower, tr = tf = around 1.8 µs, at 100 kHz or lower, tr = tf = around 3.5 µs

Rise time

Response speed

When accurate output waveforms are required, select an amplifier with a frequency bandwidth, which is higher than the required operating frequency. In the case of using sine waves, 3 times to 5 times more frequency bandwidth is required, whereas with square waves, around 10 times more frequency bandwidth is needed. Inadequate bandwidth can cause a decrease in output amplitude and a difference between input and output phases. Operating the product (load) while monitoring the actual output waveforms is recommended.

flexBox start

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 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 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 high frequency signal which reduces output frequency of an amplifier. An amplifier will be broken because of increase of internal loss.

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

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Bipolar power supplies/High voltage Amplifiers