Agilent/Keysight U1831C

The Keysight U1831C is a USB-powered smart noise source for noise figure measurements across 10 MHz to 26.5 GHz. It automatically downloads calibration data to compatible analyzers and incorporates temperature sensing for enhanced measurement accuracy. Electronic storage of ENR data eliminates manual entry errors, while low reflection coefficient performance suits general-purpose test applications.

The U1831C connects via USB for both power and data transfer, operating from a standard 5 V supply.

Technical Specifications

• Frequency range: 10 MHz to 26.5 GHz


• Excess Noise Ratio (ENR): 12 to 17 dB (nominal 15 dB)


• Noise figure measurement capability: up to 30 dB


• RF connector: 3.5 mm male


• Maximum reverse power: 1 W Power & Interface


• USB power: 5 V nominal, 500 mA maximum


• Connectivity: USB for power and data transfer Environmental


• Operating temperature: 0 to 55 °C


• Storage temperature: -40 to 70 °C


• Connector torque: 8 lb-in for 3.5 mm connector

Key Features

• Automatic ENR data download to compatible analyzers reduces setup time


• Electronic ENR calibration storage prevents user entry errors


• Temperature sensing with automatic compensation ensures consistent accuracy


• Low reflection coefficient for general-purpose measurement applications

Typical Applications Noise figure characterization of RF amplifiers, receivers, and front-end modules across microwave and millimeter-wave frequency bands.

Compatibility & Integration The U1831C integrates directly with Keysight X-Series signal analyzers, NFA'B series noise figure analyzers, M9391/3A PXIe VSA, ESA-E Series analyzers, and PSA-Series analyzers.