• R4K-36 series
  • R4K-36 series
  • R4K-36 series
  • R4K-36 series
  • R4K-36 series
  • R4K-36 series

R4K-36 series

Palmtop size Variable DC Power Supply

  • Max. Voltage: 2V to 40V
  • Max. Current: 0.1A to 4A
  • Max. Power: 0.2W to 36W
  • Excellent quietness

Ultra Compact DC Power Supply

R4K-36 series are ultra-compact, high-performance DC power supplies which achieve sufficient output of 36 W in the "palm-sized".

As the models can set and output the current at the 0.1 mA increment, the power supply is best for applications which require precise control of current such as evaluation testing of LED or EL lamps.

All models include the four-digit output voltage/current meter and digital interfaces as standard. These strong points allow you to use R4K-36 for the usage such as various quality tests and the production line of electronic components.

We pursue usability!

Compact and light-weight space saving design
Unique low noise power conversion technology for research application
Multiple units operation with master/slave and digital interface
Very quiet due to the adopting natural air-cooling system without cooling fan
Suitable for applications requiring the quietness
Four-digit meter
High resolution D/A, A/D converter integrated
Digital Interface is also available.
Programmable waveform with pulse and ramp sequence function without external signal
Output voltage and output current can be set speedily.
When setting output voltage and output current by rotary encoder on front panel, every time fine switch is pressed, setting digit on digital display will be switched. In case, setting small output value or change setting value widely, setting can be done speedily. (Fine switch cannot be used when output value is set by remote controlling.)

Ultra compact!

You can realize how small it is with comparison to a mouse.

Ultra compact!

Compared to stationeries...

Compared to stationeries…


Model Output Ripple *1 Minimum setting unit *2 AC input
voltage [V] current [A] Power [W] [mVms] [mAms] Output voltage
Output current
Input voltage Input current [typ.]
at AC
in 115 V
at AC
in 230 V *3
R4K2-0.1 0 to 2 0 to 0.1 0.2 1 1 1 0,1 115 V ±10% *2
230 V ±10%
50/60 Hz
single phase
0.1 A 0.05 A
R4K36-0.1 0 to 36 0 to 0.1 3.6 2 1 10 0,1 0.5 A 0.25 A
R4K8-3 0 to 8 0 to 3 24 4 4 1 1 1 A 0.5 A
R4K6-4 0 to 6 0 to 4 5 8 1 1 1 A 0.5 A
R4K40-0.6 0 to 40 0 to 0.6 3 1 10 0.1 1 A 0.5 A
R4K36-1 0 to 36 0 to 1 36 5 5 10 1 1 A 0.5 A
R4K18-2 0 to 18 0 to 2 5 5 10 1 1 A 0.5 A
  1. The ripple applies from 10% to 100% of the rated output.
  2. The minimum setting unit of the instrument panel. With remote controlling, more detailed settings are available. Go to "Various Digital Control Functions".
  3. -L(230V) option


Multi Setting Function

Function to memorize three different voltage and current settings in addition to standard preset function. There is no need to adjust the output when different setting and convenient function for production inspection process or testing which require frequent data sampling.

How to memorize Multi Setting Function

Delay Trigger Function

When -LUs1 or -LRmf option is selected, only one unit of R4K-36 series can be used.

Function to delay the OUTPUT ON/OFF time. *1 It is possible to use in case single unit of R4K-36 series is used, and also when connecting several Matsusada power supplies *2 using master/slave connection terminal *3 and output voltage/output current are set individually, delay trigger function can be used. *4

  1. This function is not allowed to use together with all the sequence operations in -LDe Option with Pulse sequence function, Ramp function, and Master follow function. Go to Options
  2. Can be connected up to 16 pcs.
  3. R4K-80 series, RK-80 series, RK series and REK series. Detail catalog for each model is available. Please contact nearby sales office.
  4. Only for slave-local
    In case of slave remote control, exact same model of power supply need to be used. Also, in case of slave-local, each output voltage and current can be set individually. In case of slave-remote, output voltage and current can be set with one-controlfunction which each slave unit follows the master unit setting.
Delay Trigger Function

*setting range of t1 to t8 is 0.0s to 99.9s

Two Mode Lock Function

Function to select two different lock functions for two different purposes. "Full Lock" locks all the function on front panel, and "Normal Lock" locks all the function except for ON/OFF. "Full Lock" mode shall be good in case mis-operation have to be completely avoided, and "Normal Lock" mode shall be good in case to avoid mis-operation but secure the way for emergency stop of power supply. You can select the best mode according to your level of "Security".

(In both modes, emergency stop is possible with Power Switch.)


Lock all the function other than reset lock mode, and effective for purpose to avoid mis-operation when controlled.


Normal LOCK

Lock voltage and current setting dial, and effective for purpose to avoid changing output setting by mistake or when easy emergency stop is required.

Normal LOCK

Sink Current/Sink Current Prevention Function

R4K-36 series features function to sink current, and enable to decrease the voltage quickly when turning off the output or when control the voltage down, which increase the safety of operation. In case burn-in tests such as aging test are conducted one after another in short interval, connectors can be attached or removed quickly and go for the workexchange. Which increases the efficiency of process after the output OFF operation. On the contrary by using sink current prevention function, it is possible to prevent voltage drop on the load by decreasing the current flow from load to power supply when turning off the power supply or lowering the output voltage.

Sink Current/Sink Current Prevention Function
It is not possible to stabilize the output by controlling back current. In case of load which has inverse voltage or over rated voltage, such as inductive load or regenerative motor, protect the power supply by adding dummy resister or diode to prevent back current.

Master/Slave Control

Master/Slave Control

In master/slave control, the connection must be made between the same models.

(Except for models with –LUs1 and –LRmf option)

The function is not allowed to output the average current from each power supply connected in parallel.

(A) GP-M Cable

As of models without interface option, a two-meter cable is provided in each unit. If you need a longer cable or additional cables, please consult with our sales staff.

Various Digital Control Functions

Output ON/OFF setting
Status output
(fault/output/OVP/OCP/OT/ACF/reversible sense connection)
Maximum 16 units digital control
Collective control function for multiple units
Write function Output voltage setting
Output current setting
  • Percent mode (100.00%)
  • * voltage current value mode (maximum rated voltage and current value)
OVP setting
OCP setting
  • Percent mode (100.0%)
  • voltage current value mode (over voltage/over current protection value)
Reading function Output voltage reading
Output current reading
  • Percent mode (100.00%)
  • *voltage current value mode (maximum rated voltage and current value)
Output voltage setting
Output current setting
  • Percent mode (100.00%)
  • *voltage current value mode (maximum rated voltage and current value)
OVP setting/OCP setting
  • Percent mode (100.0%)
  • voltage current value mode (over voltage/over current protection value)

* Minimum value of each model is same as minimum display of front panel meter.

Dual Tracking, Multiple Outputs

Dual tracking control enables both positive and negative outputs simultaneously in master/slave operation.

Multi outputs and various versatile operations are also possible by combining above dual tracking control and slave local mode. Positive and negative output (+V, -V) of dual tracking control and set output voltage of slave local mode can be output simultaneously by turning on the master unit.

Go to Operations for connection details.

Dual Tracking

Dual Tracking

Multiple Outputs

Multiple Outputs

Digital Interface

Digital control of USB/LAN/RS-232C/RS485/GPIB and one-control on master/slave operation

Digital Interface
(A) CO-M Cable
As of models without interface option, a two-meter cable is provided in each unit. If you need a longer cable or additional cables, please consult with our sales staff.

Remote Control Functions

Remote switch ON/OFF

* +S is common. So external control voltage shall be input with +S as reference. Otherwise it can cause failure.

Remote switch ON/OFF
Output Relay Open collector

Sink current 1 mA

Remote sensing

Compensate the voltage drop (V0-VL) due to resistance of output lead or drop of stability by contact resistance.
(maximum 0.5 V)

Remote sensing


Front panel
R4K-36 series Front panel
Rear panel
R4K-36 series Rear panel
  1. Output voltage and OVP setting display
  2. Output current and OCP setting display
  3. Remote programming display:
    Light up when output voltage/current control in remote mode.
  4. Output display:
    Light up when output is on
  5. OUTPUT ON/OFF switch:
    Used to turn output ON/OFF at local mode as well as to reset the protection functions.
  6. FINE switch:
    Switching setting digit when setting output voltage and current.
  7. Monitor terminal and Output terminal (M6)
  8. Constant voltage operation mode display
  9. Constant current operation mode display
  10. Output PRESET switch
  11. OVP/OCP switch
  12. LOCK switch
  13. OUTPUT voltage (OVP setting dial)
  14. OUTPUT current (OCP setting dial)
  15. Power ON/OFF switch:
    This has priority over all operations for safety reason
  16. Remote output ON/OFF switch
  17. +Sense
  18. OUTPUT terminal (up to 3 A)
  19. -Sense
  20. Digital interface IN (Master/Slave and Delay trigger function)
  21. Digital interface OUT (Master/Slave and Delay trigger function)
  22. Master/Slave selector switch
  23. AC inlet


For details, download the datasheet below.


-LDe: Pulse/Ramp sequence, Master follow function

above output control, between A to D is available.

A. Pulse Sequence

According to the combination with Multi Setting Function, the sequence operation is available by using the voltage and current settings stored respectively in Memory a, b, and c. Also, setting the number of operations is provided, let alone continuous operation. As the set time of Memory a, b, c or off is set to 0.0, the output control has a great variety of operations such as continuous operation in both of Memory a and b or among Memory b, c, and off. Thus, the function is ideal especially for product evaluation tests.

Pulse Sequence

ta, tb, tc, and toff can be set respectively with the range of 0.0 second, 1.0 seconds to 99.9 hours.

B. Ramp

In this function, the ramp operation is available within the voltage and current settings (or up to 0 V/0 A starting the said values). It is excellent for increasing or decreasing the voltage and current values gradually. The function can also effectively reduce the load damage caused by overshooting.

* As for the lamp operation, you can select "Both setting voltage and current", "voltage setting only", or "current setting only".


t1 and t2 can be set range of 0.0 second to 999 seconds.

C. Combination of Pulse and Ramp Sequence

Features of pulse sequence operation and ramp sequence operation can be combined for more convenient operation. In addition, by adding multi set function, sequence operation can be operated using stored voltage and current settings in each memory. The setting of repetition to say nothing of a continuous driving can be set. For example it is possible to slowly ramp up and down the voltage and current to the three different settings, and so, it is useful for various scenes.

Combination of Pulse and Ramp Sequence

t1 to t4 can be set range of 0 to 999 seconds.
ta, tb, tc and toff can be set range of 0.0 second to 99.9 hours.

D. Master follow

When the pulse sequence operation and the ramp work master-slave, the output signal to the slave unit is transmitted. The slave unit can be output in an output status different from the master unit.(Master follow function cannot be used with -LUs1 option.)

Master follow

Note: The operation accuracy of the timer when sequensing is 0.5%. Be careful when you use it by the long-term running operation.

-LH: Higher isolation voltage

This option make the isolation voltage to be ±1 kV, which enable extended capability of series operation.

-LIc: Output current accumulation function

Accumulate the output current and display its value (up to 100 Ah). Accumulated value is stored even when output is off. Also, accumulated value which stop the output can be set preliminarily, it is very suitable to the application such as controlling plating solution.

* Please consider the location of usage. High humidity environment can be the cause of failure and corrosion.

-LRmf: Remote multi function *1 *3

It is possible to control output voltage and output current by external voltage or external resistance.

+S is common. So external control voltage shall be input with +S as reference.

-LRmf option

Remote multi function
Vout, Iout Vcon, Icon R
0 to MAX 0 Vdc to approx. 10 Vdc 0 kΩ to approx. 10 kΩ

-LUs1: USB interface board *1 *2 *3

Enable digital control with USB. One power supply can be connected per one USB port which computer equipped. In case the number of USB port of the computer is not enough, use USB HUB. However, it may not work correctly, depending on USB HUB.

OS: Microsoft Windows XP/Vista/7/8/10 (Both 32-bit version and 64-bit version are available.)

Microsoft Windows is a registered trademark of Microsoft Corporation in the United States and other countries.

-LWo: Universal input Coming soon

100 Vac to 240 Vac 50/60 Hz single phase
Use appropriate AC input cable. Attached AC input cable is only for 100 V input.

-L(Mc0.5) *3: Communication cable length change

-L(Mc0.15) *3: Communication cable length change

Change length of CO-M cable to 0.5, 0.15-meter long. Select one of the two types above.

-L(200V): 200 Vac ±10% input

-L(230V): 230 Vac ±10% input

Refer Lineup for input current.

  1. When these options are selected, standard digital interface will not be equipped. Also, these options cannot be equipped together.
  2. For detailed specification of USB and digital interface, please refer data sheet of CO/USB series.
  3. -LUs1 or -LRmf option cannot be equipped together with -L(Mc0.15) and -L(Mc0.5) option.

How to Order

When ordering, add Option No. to Model No. in alphabetical order followed by numerical order.


AC Input Cable

125 V/10 A
For -L(230V) option
250 V/10 A
Sold separately
250 V/10 A


In R4K-36 series, the output voltage and current can be increased by connecting the same models in series or parallel operation.
As to the control, the use of local control or digital master/slave control is recommended. The common of the external input control connector is connected to +output of the power supply.
So, do not connect it to any common of other power supplies.

Series operation

The total output voltage can be up to 250 V. Series operation is not available for the total output voltage exceeding 250 V. In that case,the output current comes to the one of the smallest power supply.

Series operation

Parallel operation

Please use the same voltage setting for parallel operation. The output current comes to the sum of each current. In order to prevent damages, please ensure to have the maximum level of OVP of the power supply.

Parallel operation

Split operation

Positive and negative outputs are available respectively.

Split operation


For details, download the datasheet below.


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