The NH Research L4000, L4002-17 is a modular DC electronic load system engineered for high-performance testing of power supplies, batteries, and DC sources. Its configurable architecture accepts up to 16 DC load modules within a single 10.5-inch chassis, enabling users to customize power and voltage ratings for specific test requirements. Mix-and-match module selection, virtual load grouping, and slave chassis expansion deliver scalable solutions from 150 W to multi-kilowatt configurations without redesigning test benches.
Technical Specifications
The chassis accommodates five module sizes with power ratings of 150 W, 300 W, 600 W, 1200 W, and 2500 W. Maximum voltage options span 60 V, 200 V, 400 V, and 500 V. Operating modes include Constant Current (CC), Constant Voltage (CV), Constant Resistance (CR), and Constant Power (CP). Current mode delivers 0.2% FS accuracy with 0.025% FS resolution. Voltage mode provides 0.2% FS accuracy and 0.038% FS resolution. Resistance mode achieves 2% V/I accuracy when operating below programmed nominal voltage. Power mode operates at 2% accuracy with 2.5 W resolution.
DC voltage measurement ranges from 0–20 VDC and 0–200 VDC at 16-bit resolution. AC RMS voltage measurement extends to 280 V with 16-bit resolution. Transient generator capability supports dynamic load profiling and short-circuit testing.
– Key Features
• Modular design with mix-and-match configuration of up to 16 load modules per chassis
• Virtual load grouping reduces module count for diverse test scenarios
• Parallel operation under program control
• Remote sense support for accurate measurement at the device under test
• Comprehensive protection: input over-current/over-voltage, output over-current/short-circuit/over-temperature, reverse-voltage, and constant power envelope safeguards
• GPIB interface for system control and programming
– Typical Applications
Power supply validation, battery charger testing, DC source characterization, and transient load response evaluation.
– Compatibility & Integration
GPIB communication enables integration into automated test systems. Multiple chassis can be controlled via the same GPIB address for power scaling. Virtual instruments support measurement and data acquisition.
