This product has been discontinued.


Multifunctional Electronic LoadPLZ-5WH Series

Ideal for high capacity power supply and rechargeable battery evaluation!
Testing with hyper-realistic load simulation made possible!

The PLZ-5WH high power DC electronic load series is where durable, reliable ingenuity meets multifunctional and high power design. Up to 20kW can be achieved with a single unit. Thanks to the highly power dense design of the PLZ-5WH, this series can sink up to 20kW of power in a single unit. Load simulation can be achieved faster than ever before thanks to the reliable, high speed design of the PLZ- 5WH current control circuits. Accurate current measures can be made with extremely high setting resolution. A color LCD display allows for highly visible, user-friendly front panel operation. RS232C, USB, and LAN digital interfaces are included as standard for simple integration into any system.


Operating area

Wide ranging operation voltage up to 800 V.Operating voltage ranges from 10 V to 800 V.Minimum operating voltage required to sink current is 1.5 V.

Operating area

Maximum Slew Rate of 20A /μs

The PLZ-5WH series boasts a 20 uS rise time, easily satisfying the critical needs of power supply evaluation tests demanding a fast transient response.

Maximum Slew Rate of 20A /μs

Arbitrary I-V characteristics (ARB) mode

In ARB mode arbitrary I-V characteristics can be set by entering multiple I-V points (voltage and current value set points). 3 to 100 points can be registered and the spaces between all points are automatically linearly interpolated. The minimum voltage (0.00V) and maximum voltage (808.00V) are fixed. This mode can be used for the simulation of LED drivers and other DUT’s with non-linear characteristics.

Arbitrary I-V characteristics (ARB) mode

Parallel operation (Up to 100kW with parallel operation (Max. 5 units))

The PLZ12005WH/PLZ20005WH can be connected in parallel to increase the maximum system capabilities up to 100kW. While connected in parallel, one master unit has complete control of the slave unit(s), allowing the user to control the entire system and monitor all data from the master unit’s front panel. Parallel operation requires one optional parallel cable for each slave unit (up to 4). The master and slave unit settings are configured automatically upon connection. Standalone settings automatically return to normal after removing parallel cable and restarting the unit.

Parallel Operation NumberMaximum current / Maximum power
2480A / 24kW800A / 40kW
3720A / 36kW1200A / 60kW
4960A / 48kW1600A / 80kW
51200A / 60kW2000A / 100kW

Load on/off operation

The following load on/off settings are available in addition to standard operations that can be carefully adjusted to fit the needs of any test environment.

  • Start with “load on” when power is turned on
  • Display elapsed “load on” time
  • Auto “load off” when time limit is reached
  • Control “load on/off” with external controls such as relays

Operation modes

The following five operation modes are available on the PLZ-5WH. In addition, in operation modes other than CV mode, it is possible to apply a current (UVPL) or load off (UVPT) by applying a current to reach the target setting voltage.

Constant current (CC) modeA current value is specified and the current is kept constant even when the voltage changes.
Constant resistance (CR) modeA conductance value is specified and the PLZ-5W sinks current proportional to the voltage variation.
Constant voltage (CV) modeA voltage is specified and the PLZ-5W sinks current so that the voltage at the load input end of the PLZ-5W is constant.
Constant power (CP) modeA voltage is specified and the PLZ-5W sinks current so that the power consumed inside the electronic load is constant.
Arbitrary I-V characteristics (ARB) modeThe desired load characteristics can be set by specifying multiple arbitrary voltage values and current values as I-V characteristics.

Adjustable slew rate

With the PLZ-5WH, the slew rate, or speed at which current changes, is programmable. The slew rate setting will function under the following circumstances:

  • When settings are applied to change the current value (including the pulse function).
  • When the current value is changed via external control in CC mode.
  • When the current value is changed while the load is on.

The slew rate can be set as an ammount of current change per unit of time, and measured in the same units for both rise and fall times.

Operation modeCC
Operating range0.01 A / μs to 12A / μs0.02A / μs to 20A / μs
Resolution0.2mA / μs0.5mA / μs
Setting accuracy*1± (10 % of set + 20 μs)

*1 The time it takes to shift from 10% to 90% when the current is Varied from 0% to 100% of the rated current.

Sine Function

The sine function alternates the current sinusoidally. This is ideal for superimposed ripple testing for high capacity power supplies and batteries. During sine operation, the front panel TRIG OUT connector outputs a trigger signal (p.36). These settings can be changed regardless of whether the load is on or off in CC mode, but the slew rate cannot be set. The sine amplitude can be set as a number.

Sine Function

During sine operation, a trigger signal is output from the TRIG OUT connector on the front panel for 1μs when the current passes through the set value on the rising edge (sine wave phase at 0 degrees).

The trigger signal is output from the connector for 1µs.

Operation modeCC
Frequency setting range1.0 Hz to 1kHz, 2kHz, 5kHz, 10kHz
Frequency setting resolution*11Hz to 10 Hz1Hz
20 Hz to 100 Hz10Hz
200 Hz to 1000 Hz100 Hz

*1  (Reference) The resolution actually set in the device is period resolution △T = 20 μs, as shown in the equation below. For example, if you specify 900 Hz, the period set in the device will be n × △T = 56 × 20 μs = 1120 μs (where n is a number set in the device). Converted to frequency, this becomes 1/1120 μs ≈ 893 Hz.

Pulse function

The pulse function is defined as the rapid transition of two settings alternating repeatedly. This setting is suitable for dynamic transient tests for high capacity power supplies and batteries. During pulse operation, a trigger signal is output from the TRIG OUT connector on the front panel (p.36). These settings can be changed regardless of whether the load is on or off in both CC and CR modes. The pulse amplitude can be set either as a number or a percentage of the load setting values.

Pulse function

During pulse operation, the front panel TRIG OUT connector outputs a trigger signal for 1μs when the current is changed from LOW (Depth) to (High).

the front panel TRIG OUT connector outputs a trigger signal for 1μs.

Operation modeCC,CR
Frequency setting range1.0Hz to 10.0kHz
Frequency setting resolution*11Hz to 10Hz0.1Hz
11Hz to 100Hz1Hz
110Hz to 1000Hz10Hz
1.1kHz to 10.0kHz0.1kHz

*1 (Reference) The resolution actually set in the device is period resolution △ T = 1 μs, as shown in the equation below. For example, if you specify 9300 Hz, the period set in the
device will be n × △ T = 108 × 1 μs = 108 μs (where n is a number set in the device). Converted to frequency, this becomes 1/108 μs = 9259 Hz.

Sequence Function

The operator can execute a long sequence of predetermined values with the sequence function. A sequence consists of programs and steps. A program is a collection of steps, which are executed in order, one by one, starting from step 1. The program is considered complete after the last step in the program is executed.

Sequence Function

Setting rangeSettingDescription
By stepLoad valueCurrent, conductance, voltage, power.
The values that can be set depend on the current operation mode.
Slew rateSets the speed of change when the current is changed.
Step execution time0.000050 s to 3600000 s (50 μs to 1000 h), resolution: 1 μs
Load on/off controlTo turn the load on, set the load setting transition method to step or ramp.
OtherTrigger signal setting, trigger signal output
For each programNumber of loops of program1 to 100000 repetitions, or infinite repetitions.
Protection functionSpecifies the value at which a protection function (OCP, OPP,
UVP) is activated.

The TALink (Transient Acquire Link) trigger makes it possible to log data in PLZ-5WH in synchronization with the sequence steps. Logged data can then be accessed through communication with the PLZ-5WH and saved to a USB as a CSV file.

Integrated Data Function

Time elapsed, integrated current and integrated power can be logged. Logging (integration) can be coordinated to start/finish when the load turns on/off or during the start or end of a sequence. Logging can also be controlled arbitrarily.

Remote sensing function

With remote sensing, the voltage measurement point can be changed from the load input terminal to the DUT sensing point. By connecting the sensing leads to the DUT, the effects of voltage drops caused by resistance in the load cables can be reduced and the load current stabilized. To activate remote sensing, connect DUT end, and enable the remote sensing function.
●Remote sensing input rated voltage:800V

Cutoff Function

The cutoff function allows the user to enable load off once the desired time/voltage drop/integrated current/integrated power has been reached after load on. Multiple factors can be selected, with load off being implemented after the first requirement is met.

Elapsed time The load turns off when the elapsed time value reaches the specified value.
Setting range0s to 3600000 s(1000h 0min 0s)
Voltage drop The load turns off when the voltmeter value reaches the specified value.
Setting range0.00V to 800.00V
Integrated current The load turns off when the ampere-hour meter value reaches the specifiedvalue.
Setting range0.000 mAh to 800.000 kAh
Integrated power The load turns off when the watt-hour meter value reaches the specifiedvalue.
Setting range0.000 Wh to 400.000 MWh

Data Logging Function

The data logging function allows the user to log measurement values in the internal memory, and display logged data on an LCD screen (Table) as a chart (Chart). It can also be stored in CSV format on a USB and acquired through communication between the PLZ- 5WH and a PC. By setting measurement logging conditions, the timing for data logging for each measurement can be controlled and synchronized between synced devices. Additionally, log measurements can be made when the load is off, meaning that test results such as battery discharge capacity (Ah) can be measured and stored as CSV data onto a USB.

Synchronized operation

The follow ing sync hroniz ati on features are available when simply connecting the PLZ-5WH with other equipment using a communication cable. PLZ12005WH and PLZ20005WH can be connected. The synchronization feature is available during parallel operation.

  • Synchronizing load on/off among multiple pieces of equipment.
  • Synchronizing measurements (remote control).
  • Synchronizing the start time and resume time for sequences across multiple units.
Synchronized operation

External Control

The PLZ5WH can be controlled and monitored with an external device. The external control terminals are isolated from the load input terminals.

Setup Memory

The setup memory can store up to 20 sets of the settings listed below or alternatively saved on a USB memory device.

  • Operation mode
  • Load values (current, voltage, conductance, power)
  • Slew rate
  • Pulse amplitude (current/conductance or percentage)
  • Pulse interval (frequency/time of one cycle and duty cycle/operating time on the high side)
  • Sine amplitude (current)
  • Sine frequency
  • Alarm operating conditions
  • Content of ABC preset memories

A file saved on the PLZ-5W (PLZ205W, PLZ405W, PLZ1205W) can be transferred to the PLZ-5WH via a USB memory device. If the UVP is set to “limit” on the PLZ-5WH, this will be changed to +CV mode on the PLZ-5W.

Soft start function

The soft start feature controls the rise time of the load current. The soft start feature can be activated when the following conditions are met:

  • The rise time of the soft start has been set.
  • “Load on” while in CC Mode.
  • Soft start input settings start from zero input and end equal to or above the minimum operating conditions.

This function can be used if the output of the DUT becomes unstable when the load current rises sharply, or when the operator wishes to delay the current change on startup to prevent the DUT’s overcurrent protection circuit from being activated.

Soft start function

ABC Preset memories

Three setting values can be stored in preset memory slots A, B, and C. All saved settings can be accessed at the press of a button, which is perfect for when you want to quickly switch between three sets of values.

Current and Voltage Monitor

In addition to the conventional current monitor output, voltage monitor output (0V to 8V/0V to 800V) has been added to the front BNC connector.

Diverse protection functions, Other functions

Overcurrent protection (OCP), Overpower protection (OPP), Overvoltage detection(OVP), Undervoltage protection (UVP), Overheat detection(OTP), Reverse-connection detection(REV), Alarm input detection, Configuration setting, USB Keyboard Compliant.

Flexible communication interface

LAN, USB and RS232C standard digital interface. *GPIB Option

Flexible communication interface

Application examples

Battery Discharge Testing

Battery Discharge Testing

Battery discharge test can be conducted and results saved without a PC. The acquired data can be saved in CSV format on USB memory.

EV Charger Aging Tests

EV Charger Aging Tests

LV124 Standard L-02 Life test – high-temperature endurance test (Durability – Heat) 〈 Life test 〉

Motor Surge Absorption

Motor Surge Absorption

The PLZ-5WH can protect the power source and ECU from regenerative current during a brushless motor test. This is performed in CV mode and can prevent oscillation depending on the response settings.

DC-DC Converter Evaluation

DC-DC Converter Evaluation

DC-DC converter performance tests vital for automotive electric components can easily be carried out by controlling the converter input (DC power supply) and output (DC electronic load). The DC power supply and electronic load can be started up simultaneously for variation tests and efficiency tests.

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