Agilent/Keysight 346CK40

The Keysight 346CK40 is a broadband coaxial noise source engineered for precision noise figure measurements across RF and microwave frequencies. Operating from 1 GHz to 40 GHz with usable extension to 50 GHz, it delivers controlled noise performance with calibration data across the entire frequency band at 1 GHz intervals. The unit combines low VSWR design with a 6 dB output attenuator to minimize measurement uncertainty and signal reflections, making it ideal for metrology labs, research facilities, and high-frequency manufacturing environments requiring stringent calibration accuracy.

Technical Specifications

• Frequency Range: 1 GHz to 40 GHz operating; usable to 50 GHz


• Excess Noise Ratio (ENR): Typically 14 dB at 1 GHz, decreasing to approximately 5 dB at 40 GHz; nominal 3 dB to 7 dB between 37–40 GHz; nominal −0.5 dB at 50 GHz


• Output Attenuator: 6 dB included on output connector


• RF Output Connector: 2.4 mm (m)


• Input Bias Connector: BNC (f)


• Reflection Coefficient Match: Differential between 'on' and 'off' states no greater than 0.01 (typical specification)


• Operating Temperature Range: −10°C to 50°C


• Power Supply: 110–240 VAC, 50/60 Hz


• Calibration Data: Provided on USB flash device and printed documentation from 1 GHz to 50 GHz at 1 GHz steps

Key Features

• Low VSWR minimizes reflections and reduces measurement uncertainty


• Improved source impedance matching compared to baseline models


• Broadband operation eliminates need for multiple noise sources across frequency bands


• Compact, lightweight design for portability


• 6 dB output attenuator for controlled noise injection

Typical Applications

• Noise figure calibration and verification


• RF and microwave test equipment calibration


• High-frequency metrology measurements


• Advanced research and development

Compatibility & Integration The 346CK40 is engineered as a companion instrument to Keysight noise figure measurement solutions for applications spanning DC to millimeter-wave frequencies.