HH PLA Serie Slider EN

PLA Series - Small

Features of performance
Model overview
  • Input voltage up to 800 V
  • Load current up to 120 A
  • Power up to 1500 W
  • I/O Port as standard
  • Optional Ethernet + USB + RS-232
  • Optional CAN Interface
  • Optional GPIB Interface (PLA4xx and greater)
  • CC - CV - CR - CP mode
  • Protections for current and voltage
  • Maximum Power Point Tracking (MPPT)
  • V/I Characteristic function
  • Digital Master-Slave operation
  • Watchdog at remote control
  • SCPI programming with DAQ function
  • Dynamic loads
  • Depending on model, temporary overload capacity up to 1.5-fold power
  • Electronic protection
  • Silent fan cooling
  • 19 inch installation possible
  • Load inputs at front and rear side
  • 2 free calibrations after registration
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.
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. (Limited scope of functions in master-slave mode. Control via CAN interface not possible). 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.
  • 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
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.
We supply a user manual as pdf file and printed General Safety Instructions, each in German and English.

Series PLA


FTDI Driver
Virtual COM port (VCP) Driver from FTDI.
Release notes PLA software tool
Software tool for control of PLA loads with firmware revision up from 2.1.x
Software tool for transmission of single commands via GPIB/RS-232/Ethernet/CAN
PLA Tool 1.0.0.zip
Software tool for control of PLA loads with firmware revision up from 2.0.x


Application 19
LAN communication with H&H devices
Customer Application 23
Testing of a Low-Voltage Accumulator for an Electric Racecar
Application 02
Loading of low input voltages with an external auxiliary power supply
Application 03
Simulation of exponential inrush current
Application 06
Loading an AC voltage with a DC load
Application 07
Applying input voltage and PWM operation
Customer Application 22
Testing Inductive Charging Systems