Agilent/Keysight 8731A

The Keysight N8731A is a high-density, 2U rack-mountable DC power supply engineered for test and measurement applications demanding stable, accurate power delivery. This single-output supply delivers 8 V at 400 A (3200 W) with exceptional programming accuracy and low ripple characteristics. Remote sense capability, built-in voltage and current measurement, and comprehensive protection circuitry ensure reliable operation in demanding laboratory and production environments.

The N8731A supports parallel and series interconnection for scaled current and voltage requirements, making it suitable for applications ranging from component characterization to system-level power verification.

Technical Specifications

• Output: 8 V, 400 A, 3200 W single output


• Programming Accuracy: ±0.05% voltage, ±0.1% current


• Output Ripple & Noise: 60 mV peak-to-peak, 8 mV RMS


• Load Regulation: 0.2% voltage, 0.4% current (no-load to full-load)


• Control: Analog/resistance programming of voltage and current


• Measurement: Built-in voltage and current readback


• Protection: Over-voltage and over-current safeguards

Key Features

• Compact 2U form factor for space-constrained installations


• Remote sense terminals for accurate load voltage regulation


• Scalable architecture: parallel connection increases current capacity; series connection increases voltage rating


• Multiple AC input options: 190–240 V single-phase (50/60 Hz), 190–240 V three-phase (50/60 Hz), or 380–415 V three-phase (50/60 Hz)


• Factory-configured AC input - cannot be modified after delivery

Typical Applications

• Device characterization and parametric testing


• Burn-in and stress testing of components and subassemblies


• Power distribution for RF and microwave test benches


• Laboratory power verification and calibration

Compatibility & Integration Communications interfaces include GPIB, LAN, LXI, and USB for both local and remote control. Rear-panel remote sense terminals enable accurate voltage regulation at the point of load.