Agilent/Keysight 8481H

The Agilent/Keysight 8481H is a thermocouple power sensor that delivers precise RF power measurements from 10 MHz to 18 GHz. Built for demanding test environments in telecommunications, radar, and RF engineering, it combines low SWR with exceptional measurement stability to minimize uncertainty in high-accuracy power characterization.

Technical Specifications

Frequency Range: 10 MHz to 18 GHz Measurement Range: -10 dBm to +35 dBm (100 µW to 3 W) Impedance: 50 ohm Connector: Type N (male) Power Linearity: Less than 1% Sensing Element: Thermocouple Weight: 2 lb (shipping)

Key Features

• Extraordinary accuracy and stability across the full measurement range


• Low SWR for reduced mismatch-induced measurement uncertainty


• NIST-traceable calibration with stored calibration factors in onboard EEPROM


• Power linearity specification of <1% ensures linear response across the dynamic range


• Calibration port integration with compatible power meters eliminates temperature-related drift and meter/sensor variation errors

Typical Applications

• Telecommunications RF power verification


• Radar system characterization


• General RF engineering measurements


• Standards-traceable power calibration

Compatibility & Integration Designed for use with Agilent/Keysight EPM series, EPM-P series, 70100A, E1416A, and P-series power meters. Compatible with discontinued 435A/B, 436A, 437A/B, and 438A power meters. EEPROM-based calibration factor storage supports automatic calibration in current platforms; legacy compatibility models (such as CFT option) may require manual entry.