Agilent/Keysight Q8486A

The Agilent/Keysight Q8486A is a thermocouple waveguide power sensor for average power measurements across the 33 GHz to 50 GHz band. It delivers accurate readings from −30 dBm to +20 dBm with power linearity of ±0.55% (0 to +10 dBm), ±0.45% (+10 to +20 dBm), and exhibits low SWR to minimize mismatch uncertainty. The sensor integrates a thermocouple sensing element on a silicon chip, where absorbed microwave energy generates a DC voltage proportional to input power. A resistive element establishes a temperature differential between hot and cold junctions, enabling reliable detection across demanding RF and microwave test environments.

– Technical Specifications

• Frequency Range: 33 GHz to 50 GHz
• Power Range: −30 dBm to +20 dBm (1 µW to 100 mW)
• Maximum Average Power: 100 mW
• Maximum Peak Power: 15 W
• Power Linearity: ±0.55% (0 to +10 dBm); ±0.45% (+10 to +20 dBm); ±0.31% (+20 to +26 dBm)
• Sensing Element: Thermocouple
• SWR: Excellent, for reducing mismatch uncertainty
• Calibration Port: 50 MHz
• Calibration Traceability: NIST millimeter-wave sensor calibration

– Key Features

• UG-383/U waveguide flange RF input with Type-N calibration connector
• Thermocouple-based DC voltage generation proportional to absorbed RF power
• Compact dimensions (approximately 2 inches) and lightweight construction (0.53 lb net)
• Average power measurement capability

– Typical Applications

• Telecommunications infrastructure testing
• Aerospace and defense RF characterization
• Research and development millimeter-wave measurement
• Precision RF power validation in waveguide systems

– Compatibility & Integration

The Q8486A is compatible with Agilent/Keysight EPM series, EPM-P series, P-series, 70100A, E1416A, and 435A/B through 438A series power meters, enabling direct integration into existing measurement platforms.