Agilent/Keysight 6681A DC Power Supply

The Agilent/Keysight 6681A is a 5000 W single-output DC power supply engineered for R&D, manufacturing, and automated test systems requiring precise voltage and current control. The unit delivers 0–8 V at 0–580 A with exceptional low-noise performance: 1.5 mV RMS and 10 mV peak-to-peak ripple in constant voltage mode across the 20 Hz to 20 MHz bandwidth. Programming accuracy reaches 0.04% + 8 mV for voltage and 0.1% + 300 mA for current at 25°C ±5°C.

Technical Specifications

• Output: 0–8 V, 0–580 A


• Power: 5000 W


• Programming Accuracy: Voltage 0.04% + 8 mV; Current 0.1% + 300 mA


• Readback Accuracy: Voltage 0.05% + 12 mV; Current 0.1% + 400 mA


• Load & Line Regulation: Voltage (0.002% +) 0.3 mV; Current (0.005% +) 40 mA


• Output Ripple & Noise (CV mode, 20 Hz–20 MHz): 1.5 mV RMS / 10 mV p-p


• Output Ripple & Noise (CC mode, 20 Hz–20 MHz): 190 mA RMS


• Transient Response: <900 µs to recover within 150 mV after 50–100% load step


• Command Processing: 20 ms average (GPIB direct connect)


• Remote Sensing: Up to 0.5 × rated output voltage drop per load lead


• OVP Setting: 45 mV

Key Features

• Low output ripple and noise for precision measurement applications


• Selectable compensation for inductive loads


• Analog voltage and current control for immediate process response


• Built-in V and I readback for integrated metering


• Programmable operation with advanced automation control


• Comprehensive protection architecture for DUT safety


• Fan-speed control to reduce acoustic emissions

Typical Applications R&D prototyping, manufacturing test, automated test systems, and applications demanding stable low-noise DC power with high current delivery.

Compatibility & Integration GPIB (IEEE-488.2, SCPI) with SH1, AH1, T6, L4, SR1, RL1, PP0, DC1, DT1, E1, C0 capabilities; serial link supports up to 16 units at single GPIB address; analog control inputs; VXIplug&play driver support. Input: 3-phase 47–63 Hz (Option 208: 180–235 VAC; Option 400: 360–440 VAC).