Agilent/Keysight U2781A

The Keysight U2781A is a 4U USB modular instrument chasscan house up to six Keysight USB modular products. It delivers synchronized multi-module operation through its Simultaneous Synchronization Interface (SSI), star trigger bus, and dedicated trigger lines - enabling precise coordination between USB modules and external signals. The 200 W universal AC power supply and built-in protection circuit support demanding industrial and scientific workflows in R&D, design validation, and manufacturing environments.

Technical Specifications

• Chassis Height: 4U


• Module Slots: Six USB modular product slots


• Power Supply: 200 W universal AC input


• Dimensions: 270.00 × 271.20 × 197.00 mm (10.63 × 10.68 × 7.76 in)


• Clocking: Internal 10 MHz reference clock per module slot; external 10 MHz reference clock input


• Connectivity: High-Speed USB 2.0 (USBTMC-USB488 standard); external trigger-in and trigger-out via BNC connectors


• Environmental Control: Dual temperature sensors, built-in fan with speed monitoring

Key Features

• Synchronization: Simultaneous Synchronization Interface with star trigger bus and dedicated trigger lines for precise inter-module and external signal coordination


• Module Flexibility: Supports U2300 and U2500 Series DAQ devices plus USB modular instruments (digital multimeters, arbitrary waveform generators, oscilloscopes, source measure units)


• Scalability: Expandable to 384 channels when populated with six U2331A Series modules


• Hot-Swap Operation: Auto-detectable, hot-swappable modules minimize reconfiguration overhead


• Thermal Management: Integrated fan and temperature monitoring maintain stable operating conditions

Typical Applications

• Research and development workflows requiring multi-instrument synchronization


• Design validation with coordinated measurements across multiple channels


• Manufacturing test systems leveraging synchronized data acquisition

Compatibility & Integration The U2781A integrates with Keysight VEE, MATLAB, NI LabVIEW, and Microsoft Visual Studio. Standard SCPI command support and Keysight Measurement Manager (KMM) software compatibility enable rapid test program development and deployment. End of Life Notice: Production discontinues June 1, 2024. Standard 5-year support extends beyond discontinuation.