NH Research 81201 VXI DC Electronic Load

The NH Research 81201 is a single-slot, C-size VXIbus DC electronic load module engineered for testing and characterization of DC power sources and energy storage devices. Operating in static and dynamic modes, it delivers programmable constant current (CC), constant voltage (CV), constant resistance (CR), and constant power (CP) loading profiles with selectable current slew rates and glitch-free mode transitions. The module integrates natively into any VXIbus-based test system and supports parallel operation for higher continuous power demands.

– Technical Specifications

Electrical Performance
• Power rating: 50 W continuous; higher ratings available at reduced duty cycles
• Voltage range: Up to 75 V
• Current range: 1 A or 10 A selectable
• DC voltage measurement: 0–20 V and 0–200 V ranges, 16-bit resolution
• AC RMS voltage measurement: Up to 280 V, 16-bit resolution

Operating Modes
• Static and dynamic operation
• Constant Current, Constant Voltage, Constant Resistance, Constant Power
• Programmable transient response with user-selectable slew rates
• Fast short-circuit capability via SCR and shorting relay configuration

Protection
• Over-voltage, reverse-voltage, over-current, over-power, and over-temperature protection

– Key Features

• Single-slot form factor minimizes rack space requirements
• Analog input interface enables external load-current control across full operating range
• Parallel-capable—two or more modules combine for sustained operation above individual 50 W ratings
• Glitch-free transitions between all operating modes
• Analog control circuitry monitors thermal conditions for safe high-power transient operation

– Typical Applications

• Power supply testing and validation
• Battery and energy storage device characterization
• DC source load profiling and stability assessment
• Dynamic load simulation with programmable transient profiles

– Compatibility & Integration

Designed as a standard module within the NH Research 8100i Family of automatic power supply test systems. Interfaces directly with VXIbus controller architectures. Supports external analog control for integration into automated test sequences and complex loading scenarios.