• 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: 2 to 40 V
  • Max. Current: 0.1 to 4 A
  • Max. Power: 0.2 to 36 W
  • 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". There are models that can set and output the current at the 0.1 mA increment, so the best power supply for applications which require quite precise control of current such as evaluation test of LED or EL lamps.
All models include the four-digit output voltage/current meter, and digital interfaces as standard equipment. 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 remotely.)

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 Minimum setting unit *1 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 *2
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 minimum setting unit of the instrument panel. With remote controlling, more detailed settings are available. Go to "Various Digital Control Functions".
  2. -L(230V) option


Multi Setting Function

Function to memorize three different voltage and current settings in addition to standard preset function. 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

In case -LUs1, -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 when decrease the output voltage.

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.
Sink Current/Sink Current Prevention Function

Master/Slave Control

Master/Slave Control

Master/slave can be used only when same model is used.
(Except the model with -LUs1 or -LRmf option.)

This is not a function for parallelly connected power supplies to give out average output current.

(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 (maximum 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 (maximum 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, which enables both positive and negative outputs simultaneously in master/slave operation, is possible. 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

Dual Tracking

Dual Tracking

Multiple Outputs

Multiple Outputs

Digital Interface

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

*Ethernet is a registered trademark of Xerox Corporation.

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
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 (as well as Master/Slave and Delay trigger function)
  21. Digital interface OUT (as well as Master/Slave and Delay trigger function)
  22. Master/Slave selector switch
  23. AC inlet


-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.

-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 USB port which computer equipped is not enough, please use USB hub. However, depending on USB hub, it may not work correctly.

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.

-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.)


Remote multi function

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

-LWo: Universal input Coming soon

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

-LH: Higher isolation voltage

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

-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.

-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 cannnot 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 cannnot be equipped together with -L (Mc0.15) and -L (Mc0.5) option.

-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.

* The ramp operation can be set with a range among “both settings of voltage and current value", "voltage setting only", and "current setting only".


t1 and t2 can be set range of 0.0 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.

How to Order

To order, please add the above option number to the model number.
alphabetical, AC input order


AC Input Cable


125 V/10 A


250 V/10 A
fot -L (230 V) option


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

Total output voltage is to be up to 250 V (-LH option models: 1 kV). Therefore for models with output voltage of over 250 V (or 1 kV), series operation cannot be conducted. Output current is to be the smallest current of those.

Series operation

Parallel operation

Please keep all the settings of voltage the same. Output current will be the summation of each current. Please keep OVP level of power supply maximum to prevent any damage.

Parallel operation

Split operation

Positive output and negative output are available.

Split operation


R4K-36 series Accessory Kit

* Power supply is not included in the accessories.

Various accessories are available for convenient use of the unit.

Quintette case (R4K-36QC)

Special designed case to bind 5-unit of R4K-36 series. Power ON/OFF switch will be consolidated, and also AC input line on rear panel will be bundled to one. Also, handle on the top makes easy to carry.


  • One set of translator for AC cable of five R4K-36
  • Input AC cable 2.5 m single phase (3-pin type) (1)
  • Instruction manual (1)
  • CO-M cable 2 m (1), 0.5m (4)
  • R4K-36 installation into the case to be conducted by customer. Please consult with sales office in case R4K-36 expected to be fit into the case by manufacturer side.
  • Ambient temperature must not exceed the power supply's operation temperature in order for the temperature inside power supply to remain in the operation temperature. (power supply life time could be shortened to 50% if it operates in a condition where ambient temperature is 10ºC higher) It is user's sole responsibility to monitor the ambient temperature not to exceed the specification.
  • Input AC for Quintet case is 115 V. In case 5 units of R4K-36 series power supply ordered with option -L (230 V) are expected to use with the case, please specify R4K-36QC-L(230 V) at the purchase.

Rack mount holder [RMO series]

10 Units/1 rack holder, and can be placed in a cabinet. Easy to take one unit out. Best suitable for a system operation. With fan unit for forced air cooling.

Rack mount holder [RMO series]

Power Supply start

For one unit operation...

Power Supply stand
Power Supply stand


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