Multi-functional Electronic LoadPLZ-4WH Series

Load-on/off operations

Adopting the Load-on/off functions that flexibly apply to the system

With load-on/off operations, the following items can be selected in addition to standard operations:

• Start-up with load-on status when the power is turned on
• Display the elapsed time of the load-on period
• Load-off after a certain time has elapsed
• Load-on/off by the relay or other external signal

Soft start function

Assures even with steep voltage application

In constant current mode, the product can prevent the generation of overcurrent* even when voltage is steeply applied from the DUT in “Load On condition and with the current having been set.” For example, in a battery discharge test, it can suppress the generation of overcurrent when for some reason voltage is suddenly applied to an Electronic Load used for discharge.
*There is electrostatic capacitance between the Electronic Load input terminals. Charging and discharging current flows to this capacitance.

Ability to start up the power in CC mode

In many cases during constant voltage power supply tests, testing is conducted in constant resistance mode for start-up time measu- rements (during start-up), an d in co ns t ant cur rent mode during load change tests. If, however, the soft start time is set to a time corresponding to the start- up time of the cons tant voltage power supply, it is possible to perform start-up time measurements and load change tests in constant current mode, without changing the operation mode. (Either 1, 2, 5, 10, 20, 50, 100, or 200 ms can be selected as the soft start time.)

Sequence function

Actual load simulation by programming current waveforms internally

Arbitrarily set sequence patterns can be saved in the built-in memory and executed. Ten normal sequence programs and one fast sequence program can be saved. Although sequence editing and execution can be performed from the panel, those tasks can also be performed easily by using the application software separately sold “Wavy”* sequence creation software.
*A personal computer will require one of the following interfaces: USB, RS232C, or GPIB

Normal sequence

The execution time and Load ON/OFF can be set for each step. The level can be changed not only in a stepped form but also in a ramped form. It is also possible to cancel pausing both by using the PAUSE function and by external trigger input, and to synchronize with trigger output and other external equipment.

Fast sequence

Each step is executed at high speed. Since the time resolution is high, fast simulation is possible. The execution time, level, and trigger output can be set.

Sequence configuration parameters

Remote sensing function

Compensating the voltage drop of the wiring

Connecting a sensing terminal to the DUT makes it possible to set the combined resistance, including even the resistance of the wiring, from the panel in constant resistance mode. Also, points that connect the sensing function can be set to a certain power and certain voltage in constant power mode and constant voltage mode. Furthermore, since transient characteristics are improved in these constant voltage, constant power, and constant resistance modes, it also leads to operational stability. (Voltage that can be compensated: 2V one way)

Switching function

Transient response test conditions are also freely changeable on the spot

In constant current mode and constant resistance mode, switching operations of up to 4 kHz are possible with the built-in oscillator. Also, the level, frequency, duty cycle (ratio), and other configuration parameters can be changed even during a load-on period.

Short function

Improved efficiency for the current limit evaluation with a single action

In tests such as the DC power supply “fold-back type drooping charac teristics test of current limiting charac teristics,” the maximum current (in constant current mode) or the minimum resistance (in constant resistance mode) can be set with a single action and thus increase work efficiency. At the same time, since contact signals are output to an EXT CONT connector, it is possible to achieve even lower impedance shorting by driving exterior relays and shorting the output of the tested device.

Elapsed time display and automatic load-off timer

Convenient battery discharge function

By combining four functions, namely, the elapsed time display, undervoltage protection (UVP), load-off voltage display, and automatic load-off timer, it is possible to perform two tests that are convenient for battery discharge testing, namely, the “measurement of time from discharge start to the final voltage” and “measurement from discharge start to the closed circuit voltage after a certain time has elapsed.”

ABC preset memory

Instantaneous retrieval of settings

Settings can be saved in three memories (A, B, and C) that are available for each range of each mode. Saved set tings can be freely retrieved and saved even during load-on periods. In constant current + constant voltage mode and constant resistance + constant voltage mode, the memories for the constant current and constant voltage, and for the constant resistance and constant voltage, can be retrieved and saved.

Protective functions and other features

Overcurrent protection (OCP), overpower protection (OPP), overvoltage protection (OVP), undervoltage protection (UVP), overheat protection (OHP), reverse connection protection (REV), external alarm input detection, configuration setting, and setup memories (100)