Keysight (Agilent) 346A

The Keysight 346A is a broadband noise source engineered for precise noise figure measurements spanning 10 MHz to 18 GHz. It delivers a stable, individually calibrated noise output with nominal 6 dB excess noise ratio (ENR), making it the standard choice for noise figure meter calibration and amplifier noise characterization. The instrument minimizes measurement uncertainty through controlled reflection characteristics and 50 Ohm output impedance.

Technical Specifications

• Frequency Range: 10 MHz to 18 GHz


• Excess Noise Ratio (ENR): 6 dB nominal (4.5 to 6.5 dB range, 5 to 7 dB limits)


• VSWR: Less than 1.3:1


• Reflection Coefficient Change (ON to OFF): Less than 0.01


• Output Impedance: 50 Ohms


• Power Requirement: +28 VDC, 100 mA


• Dimensions: 21 mm W × 30 mm D × 140 mm H (0.8 in × 1.2 in × 5.5 in)

Key Features

• Individually calibrated ENR data at discrete frequencies supplied with each unit


• Calibration data optimized for direct loading into NFA Series analyzers


• Separate reflection coefficient characterization (ON and OFF states) included


• Multiple output connector options: 3.5 mm male (standard), Type-N male (Option 001), APC-7 (Option 002), Type-N female (Option 004)


• BNC female bias input connector

Typical Applications

• Noise figure meter calibration and verification


• Low-noise amplifier characterization


• Receiver noise performance analysis


• System-level noise figure validation

Compatibility & Integration Works directly with Keysight NFA Series Noise Figure Analyzers, ESA-E Series, PNA-X, PSA Series, X-Series (PXA, MXA, EXA, CXA), and the 8970B Noise Figure Meter.