Modular DC Load 120V – 4312 Series

Modular DC Load for Charger Testing, LED Driver Testing, Solar Panel Testing, & More!


  • 3 sizes – 150, 300, & 600W @ 120V with advanced measurement capability built-in
  • Mix & match loads for maximum configuration flexibility
  • Up to 16 loads in a single, 8 3/4″ / 5U Model 4300 chassis
  • Front loaded & front connections
  • 3 voltage and 3 current ranges for improved accuracy
  • High-resolution waveform capture for analysis of dynamic transients
  • Isolated digital inputs & outputs for test fixture support
  • PC/LAN control with LabVIEW & IVI drivers
4350 DC Electronic Load (front)


The concept of having an advanced digital measurement system built in to each load plus being able to combine up to 16 of such loads into a single chassis opens several new test strategy possibilities that have significant economic and quality benefits.

The most important test strategy is the ability to test consumer power devices such as chargers, adapters and LED drivers in parallel, up to 16 in a single pass. Test times for such devices are now measured in a few seconds.

The other major advantage of this distributed measurement is the ability to test each output of a multi-output power conversion device simultaneously rather than sequentially. Not only does this dramatically reduce the overall test time but also provides far better channel-to-channel performance measurements including dynamic cross effects. In this manner quality of the devices tested takes a large step forward because the parallel tester better simulates real life conditions where all outputs are exercised together.

Yet another benefit of such a flexible load/measurement system is the ability to reconfigure the loading to adapt to almost any new loading arrangement required by brand new UUTs in the future.

Military, Aviation Test Solutions - NH Research (NHR)

Advantages and Benefits


  • Modular load maximizes configuration flexibility
  • Simplifies automated test stand development
    - Triggerable set & measurment
    - Short circuit mode & over voltage relay
    - Isolated digital inputs & outputs
    - Built-in SW watchdog & safety limits
  • Software tools to shorten test development time
    - PC-based Softpanel GUI with scope display
    - Supplied LabVIEW & IVI-C/IVI-COM drivers
    - Optional: DC Load, emPower®, or Enerchron® test sequencer


  • Modular - up to 16 loads or combinations in single chassis
  • Built in features require fewer test devices
  • Front connections simplify wiring
  • Safety limits protect UUT

DC Loads: Ultimate Configuration Flexibility for Parallel Testing

Chart 4300 Multiple Load Configurations - NH Research (NHR)
5 of the 25 possible load configurations using 150W, 300W & 600W dc loads.

Constant Power Envelope

Chart: Constant Power Operating Envelope 4312 Series
Constant Power operating envelope (4312)
Chart: Constant Power Operating Envelope 4350 Series
Constant Power operating envelope (4350)
Communications Radar System - NH Research (NHR)

Testing Applications


  • ATE Testing: Radar Power Emulation, Aviation, Power Supply, Solar Panel
  • Power Devices: Chargers, Adapters, DC Supplies, LED Drivers, Telecom Rectifiers
  • Fuel Cell Test, Super Capacitor Test
  • Power Conversion
  • EV Subsystem Test: OBC, V2G, APM, DC/DC Converter
  • Highly Modular, Flexible & Compact Test Requirements


“NHR’s 4300 platform provides us with the performance, reliability, and long-term support we need for the eCASS Program. We look forward to working together in the future.”

– Ed Melville, Automated Test Systems Portfolio Manager, Lockheed Martin

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