Agilent/Keysight 346B

The Agilent/Keysight 346B is a broadband noise source engineered for precision noise figure measurements spanning 10 MHz to 18 GHz. It delivers stable, repeatable noise power output with a nominal Excess Noise Ratio (ENR) of 15 dB, making it essential for characterizing RF amplifiers, receivers, and related components across multiple frequency bands. The unit combines high ENR performance with low SWR across its operating range, minimizing measurement uncertainties from signal reflections and reducing the need for multiple noise sources.

Technical Specifications

• Frequency range: 10 MHz to 18 GHz


• Nominal ENR: 15 dB (14 to 16 dB limits)


• Noise figure measurement range: Up to 30 dB


• Maximum SWR: 1.30:1 (10–30 MHz); 1.15:1 (30–5000 MHz); 1.25:1 (5–18 GHz)


• Power requirement: 28 ±1 Vdc


• Input impedance: 50 Ω Connectors


• Standard: APC 3.5 mm (male)


• Bias input: BNC (female)


• Optional: Type-N (male), APC-7, Type-N (female) Physical Dimensions


• 140 mm (H) × 21 mm (W) × 30 mm (D)


• Weight: 0.108 kg net

Key Features

• Broadband coverage eliminates frequency-band-specific noise sources


• Controlled SWR across three distinct frequency bands reduces reflection-induced measurement error


• Compact form factor integrates readily into test racks and automated systems


• Multiple connector options accommodate diverse RF architectures

Optional Configurations Option H01 delivers 21 dB typical ENR for high noise figure device measurement. Option H42 targets DBS low noise block converter testing with WR75 waveguide output, 5 dB ENR, and optimized calibration uncertainty.

Compatibility & Integration The 346B integrates with Keysight noise figure meters and measurement systems including NFA, ESA-E Series, PNA-X, PSA-Series, and X-Series instruments (PXA, MXA, EXA, CXA).