HH PLI Serie Slider englisch

PLI Series

Features of performance
Model overview
  • Input voltage up to 1,200 V
  • Load current up to 2,700 A
  • Power from 600 W to 28,800 W
  • Temporary power overload capacity, depending on model
  • Models with integrated zero-volt supply - PLIxxxxZV
  • Models with several current seting and measuring ranges - PLIxxxxMR
  • High power density up to 2,100 W in 2 U (3,200 W in 3 U)
  • Ethernet + USB + RS-232 + CAN as standard (GPIB optional)
  • Intuitive operation
  • Quick operation by shortcuts
  • Setting toggling
  • Constant current, voltage, resistance and power mode
  • MPP Tracking function
  • Digital Master-Slave operation
  • Energy storage test
  • Internal resistance measurement
  • Protections for overcurrent and undervoltage
  • Dynamic loads
  • Trigger model
  • SCPI programming with synchronous measurement
  • USB MSD as measurement data memory
  • Electronic protection
  • Analog monitoring outputs for voltage and current
  • Analog control input
  • Digital input and programmable control output
  • Silent fan cooling
  • Settings saving
  • Bilingual help system (German and English)
  • 2 free calibrations
The PLI series of electronic loads provide a comfortable operation by a graphical user interface. The PLI series highlight is the extensive variety of standard interfaces. Apart from Ethernet, USB, RS-232 and Analog interface there is a standard CAN interface. Programming is done in SCPI syntax.
The units provide constant current mode, constant voltage mode, constant power mode and constant resistance mode. In addition, protections for current and voltage can be set in any mode. A static data acquisition function allows to store measurement data on an external USB flash drive. Dynamic operation can be configured by up to 300 list point settings. The Electronic Load saves the synchronously acquired measurement data with timestamp. A configurable trigger model controls data acquisition, static and dynamic settings.
Zero-Volt Models - PLIxxxxZV
Special applications, such as fuel cell tests, need to load the DUT down to almost 0 V. For these purposes we supply a range of models with an integrated zero-volt supply. When I/O port signals are to be used, the GND of the I/O port must be galvanically isolated from the negative load input. Therefore we recommend to install the optional galvanically isolated I/O port (option PLI06) at these models.
Multi-Range Models - PLIxxxxMR
A model variant with 3 or 4 "real" current ranges allows the setting and measurement of current, power and resistance over a wide range of values with high resolution and accuracy. Especially solar and PV applications have high requirements at this point. The ranges are graduated with factor 10 each.
Special Functions
  • Energy Storage Test/Discharge Function
An implemented test function enables discharging energy storages such as accumulators, batteries, ultracaps etc. in an easy way and supplying determined values like charge and energy.  
  • Internal Resistance Measurement
Measurement of the internal DC resistance of energy storage systems such as batteries, accumulators, capacitors, as well as cables, power supplies and so on.  
  • Watchdog Function
When the watchdog function is activated, the load input is switched off in the event of a faulty communication with the control PC in order to protect the connected test item.  
  • MPP Tracking (Optional)
The Electronic Load automatically searches for the Maximum Power Point of solar panels and self-adjusts as the sun's radiation changes.
Loading Capacity
The model range covers power classes from  600 W, up to 28,000 W continuous power rating. In addition the models up to 300 V have an overload capability. The height and duration of the possible overload depends on the temperature of the power stage. The unit indicates the currently possible overload. Therefore the units can be used  even for considerably more powerful applications.
  • Current limitation
  • Power limitation
  • Overtemperature protection
  • Undervoltage indicator
  • Protection of the  GND lines at the  Analog I/O Port
Data Interfaces
The following interfaces are included as standard or optionally:
  • Ethernet
  • USB
  • RS-232
  • CAN
  • GPIB (option PLI02)
LabVIEW drivers are certified by National Instruments.
Analog I/O Port
The standard Analog I/O Port provides the following functions:
  • Load setting C and V
  • Analog setting the C and V protections
  • Load on-off
  • Voltage monitor output
  • Current monitor output
  • Trigger input
  • Trigger output
  • Digital input and programmable control output
Galvanically Isolated Analog I/O Port
For the galvanic isolation between the Analog I/O Port and the load terminals the PLI06 option can be installed. Isolation voltage is 800 V. Using this board also prevents ground loops.
Help System
A help system for most menu items is integrated in the user interface. The help system's language can be set to German or English.
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 a completed satisfaction rating is available for the respective device.
--> 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 PLI

PLI EC - Extended Current Range

PLI models with extended current range.

PLI HV - 1200 V

PLI models for high input voltages.

PLI MR - Multiple Current Ranges

PLI models for setting and measuring smallest currents with high accuracy and resolution.

PLI ZV - from 0 V

PLI models with an integrated Zero-Volt-Supply for applications needing to load the DUT down to almost 0 V.


Release notes PLI software tool
Software tool for transmission of single commands via GPIB/RS-232/Ethernet/CAN
LabVIEW®2015 driver for PLI series with firmware revision up from AI3.7 DI3.3 UI3.4
LabVIEW®2012 driver for PLI series with firmware revision up to DI2.8 AI2.8 UI2.8
Software tool to control PLI loads with firmware revision up from AI3.7 DI3.3 UI3.4
Software tool (old revision) to control PLI loads with firmware revision from AI2.7 DI2.7 UI2.7 to AI2.9 DI2.9 UI2.9
Software tool (old revision) to control PLI loads with firmware revision from AI2.6 DI2.5 UI2.5 to AI2.6 DI2.6 UI2.6


Application 15
Testing chargers with Charger Starter Interface for PLI series loads
Application 09
Simple battery simulation with a PLI electronic load and a power supply
Application 01
Source-Sink with power supply and H&H PLI electronic load
Application 02
Loading of low input voltages with an external auxiliary power supply
Application 03
Simulation of exponential inrush current
Application 05
Measuring the characteristics of solar panels
Application 06
Loading an AC voltage with a DC load
Application 07
Applying input voltage and PWM operation
Application 12
PLI series - programmable load profile, trigger system and its capabilities
Application 13
Realization of a CSV load profile
Application 11
Energy storage test and internal resistance measurement with PLI series electronic loads