Keysight (Agilent) N8731A DC Power Supply

The Keysight N8731A is a 3200 W single-output DC power supply delivering 8 V at 400 A, engineered for automated testing, research and development, and manufacturing process control. Its compact 2U rack-mountable form factor integrates into diverse test environments with front-to-back airflow and standard rack mount ears. Universal AC input (85–265 Vac) with optional three-phase configurations ensures flexible deployment, while USB, LAN (LXI-Core), and GPIB interfaces support remote operation via built-in web server.

Programming accuracy of 0.05% + 4 mV (voltage) and 0.1% + 800 mA (current) with 60 mV p-p output ripple meets demanding metrology requirements.

Technical Specifications

• Voltage: 8 V


• Current: 400 A


• Power: 3200 W Accuracy


• Voltage: 0.05% + 4 mV


• Current: 0.1% + 800 mA Output Ripple and Noise


• CV p-p: 60 mV


• CV rms: 8 mV AC Input


• Universal: 85–265 Vac


• Optional: 208 V 3-phase, 400 V 3-phase, or 230 V single-phase


• AC input configuration is factory-installed and not field-changeable Interfaces


• USB, LAN (LXI-Core), GPIB


• LXI Class C compliant


• Web-based remote control and monitoring

Key Features

• Analog programming via 0–5 V / 0–10 V or 0–5 kΩ / 0–10 kΩ inputs


• Integrated voltage and current measurement


• Front panel voltage and current adjustment knobs with optional lock function


• Overcurrent, overvoltage, undervoltage, and overtemperature protection


• Parallel connection: up to four units for increased output current


• Series connection: two units for higher output voltage


• Busbars for low-voltage connections; wire clamp connectors for higher-voltage models


• Optional slide kit for flexible rack mounting

Typical Applications Automated test systems, R&D benches, and manufacturing quality assurance requiring stable, precisely controlled DC power with remote programmability and comprehensive fault detection.

Compatibility & Integration LXI-Core compliance and multi-protocol I/O (USB, LAN, GPIB) enable straightforward integration into existing ATE and laboratory automation frameworks. Built-in web server permits browser-based control independent of dedicated drivers or software installations.