PLA SERIES – DC Loads

Description

PLA series electronic loads combine classic design, large display with modern interfaces and great functionality. The highlight of the PLI series is the extensive variety of optional interfaces. In addition to Ethernet, USB, RS-232 can be installed and also a CAN interface. In addition, for devices with 400 W GPIB is optionally available. I/O port ist standard. Programming is done in SCPI syntax.

Functions

The units provide constant current, constant voltage, constant resistance and constant power mode. In addition, protections for current and voltage can be set in any mode. Dynamic operation can be configured by up to 100 list point settings. A data acquisition function allows to save 100 measurement points (time, voltage, current) on an internal memory chip.

Special Functions

V/I Characteristic Function:In the V/I characteristic function, a sequence of voltage values is interpolated linearly to a sequence of current values (2 to 100 values each). Depending on the value of the input voltage, the electronic load sets the current which corresponds to the interpolated point of the characteristic. In this way non-linear characteristics such as diode characteristics can be simulated. Maximum Power Point Tracking (MPPT): An extensive Maximum Power Point Tracking (MPPT) function for testing photovoltaic panels can be activated. In variable sweep periods, the V/I characteristic of the panel is measured and stored. The sweep direction is selectable. The absolute maximum power found is controlled until the function is stopped or a certain minimum voltage is underrun. If the panel voltage is above the minimum voltage again, the load continues the sweep and control process. Digital Master-Slave Operation: To increase the power or current capability up to 5 electronic loads of equal type can be operated in parallel in Master-Slave mode as one system. The Master unit controls the total input current of the system. This unit also shows the system’s total measurement values at its display and returns them in case of query via one of the data interfaces. The voltage measured at the Master unit is the base for the controlled settings in voltage mode, power mode and resistance mode. Watchdog: When controlled via a data interface, a watchdog can be activated to protect the load input and thus the DUT, which switches off the load input if the communication interface fails or malfunctions.

Loading Capacity

The type spectrum contains models in the power categories 200 W, 400 W, 800 W and 1200 W. In addition, the models up to 300 V have an overload capability. The level and duration of the possible overload depends on the temperature of the power stage. Therefore the units can be used even for considerably more powerful applications for a short time.

Protections

• Current limitation
• Power limitation
• Overtemperature protection
• Overvoltage indicator
• Undervoltage indicator
• Protection of the GND lines at the I/O Port

I/O Port

The standard I/O Port provides the following functions:

• Load setting C and V
• Load on/off
• Voltage monitor output
• Current monitor output

Calibration

A free Factory Calibration Certificate (FCC) is supplied with the devices. The calibration process is subject to supervision in accordance with DIN EN ISO 9001. The calibration certificate documents the traceability to national standards to illustrate the physical device in accordance with the international System of Units (SI). Within the 2-year warranty period, we will calibrate a second time free of charge if the respective device (serial number) will have been registrated at H&H.

–> Conditions for a second free calibration

For use under laboratory conditions, H&H recommends a calibration interval of 2 years. This is an empirical value that can be used as a guide for the first period of use. Depending on the intended use, service life, relevance of the application and ambient conditions, the operator should adjust this interval accordingly.

Documentation

We supply a user manual as pdf file and printed General Safety Instructions, each in German and English.

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