Keysight (Agilent) N8974A

The Keysight N8974A is a noise figure analyzer designed for precise characterization of amplifiers and frequency translating devices from 10 MHz to 6.7 GHz. It delivers simultaneous noise figure and gain measurements with repeatable accuracy across six user-selectable measurement bandwidths. The instrument supports external noise sources from the Keysight SNS series and extends to 110 GHz with specialized K-Series block downconverters.

A dedicated second GPIB interface enables Local Oscillator control, streamlining complex measurement workflows for wireless communication and aerospace/defense applications.

Technical Specifications

• Frequency Range: 10 MHz to 6.7 GHz (extendable to 110 GHz with block downconverters)


• Noise Figure Range: 0 to 35 dB (source dependent)


• Gain Range: −20 to +40 dB


• Measurement Bandwidths: Six user-selectable options


• Standard Connector: APC 3.5 (m)

Key Features

• Simultaneous noise figure and gain characterization


• Compatible with SNS series noise sources: N4000A, N4001A, N4002A


• K-Series block downconverter support for frequency extension (e.g., N8974AZ-K98 for 86.5 to 100.0 GHz)


• Dedicated GPIB interface for LO control


• Optional high-stability frequency reference (N8974A-1D5)


• ANSI Z540 compliant calibration with test data available (N8974A-A6J)


• Rackmount configuration option (N8974A-1CP) with integral handle kit


• Front panel cover available (N8974A-UK9)

Typical Applications Wireless communication amplifier characterization; aerospace and defense device testing; frequency converter noise performance evaluation.

Compatibility & Integration Works with SNS-series broadband noise sources for rapid noise figure acquisition. Block downconverters extend measurement capability beyond 6.7 GHz. Documentation includes user manuals, application notes, installation guides, and programming resources.