Agilent/Keysight U8489A

The Keysight U8489A is a USB thermocouple power sensor engineered for precise power measurements across DC to 120 GHz. It delivers direct USB connectivity without requiring a separate power meter or external power supply, streamlining test setups and enabling field portability. The sensor excels at measuring peak and average power in pulsed and modulated signal environments typical of radar, telecommunications, electronic warfare, and RF/microwave testing.

Technical Specifications

• Frequency Range: DC to 120 GHz


• Dynamic Range: −35 dBm to +20 dBm


• Power Linearity: <0.8%


• Measurement Speed: Up to 900 readings per second (fast buffer mode)


• DC Coupling: Enabled for DC measurements


• Calibration: NIST or NPL traceable


• Measurement Uncertainty: Real-time feature available


• Correction Functions: S-parameter and gamma correction


• Internal Calibration: Available to reduce measurement uncertainty

Key Features

• 900 readings per second measurement throughput for thermocouple sensors


• power linearity at <0.8% for high-accuracy average power measurements


• DC coupling enables measurements from DC for signal source calibration, power references, and EMC applications


• External trigger input (BNC to SMB connector) for synchronized test sequences


• USB 2.0 interface with bus-powered operation

Typical Applications

• Radar system characterization and validation


• Pulsed and modulated signal power measurement


• Electronic warfare signal analysis


• Telecommunications power monitoring


• RF/microwave component testing

Compatibility & Integration The U8489A integrates with Keysight network analyzers for source power calibration, FieldFox RF analyzers, and MXG signal generators. BenchVue software and the BV0007B power meter/sensor control app enable instrument connection, control, and data logging without custom programming. The sensor builds on the proven front-end design of the legacy 8480 and N8480 Series power sensors with improved specifications and modern USB capabilities. Physical Specifications: 125.75 mm × 46 mm × 35.90 mm; 0.20 kg