Agilent/Keysight N4431D

The Keysight N4431D is a 4-port electronic calibration (ECal) module engineered for rapid, accurate calibration of Keysight vector network analyzers. Operating from DC to 13.5 GHz, it delivers full 4-port calibration in a fraction of the time required by mechanical kits, while eliminating connector wear and reducing setup complexity. Direct USB control from the VNA eliminates the need for external PCs or operator intervention between port connections.

Technical Specifications

• Frequency range: DC to 13.5 GHz


• Impedance: 50 Ohm (Type-N reference)


• Port count: 4


• Calibration method: Electronic (ECal)


• Control interface: USB

Key Features

• Fast 4-port calibration cycle dramatically reduces measurement setup time versus mechanical calibration kits


• Flexible connector architecture supports Type-N, 3.5 mm, 7-16, and 4.3-10 connectors in female-female, male-male, or mixed configurations


• Direct VNA control via USB eliminates manual port cycling and associated connector stress


• Broad DC to 13.5 GHz frequency coverage enables single-module operation across baseband through X-band applications


• Available configurations include N4431D/010/0DC (four 3.5 mm female connectors) and N4431D/020/0DC (four Type-N 50 Ohm female connectors)

Typical Applications

• Broadband device modeling and characterization


• Time-domain and signal integrity analysis


• Multiport measurements in high-volume production environments


• Phased array antenna and massive MIMO testing


• High-speed digital interconnect validation

Compatibility & Integration The N4431D integrates directly with Keysight vector network analyzers via USB. Port-specific connector selection accommodates integration into existing test benches without adapter chains, supporting mixed connector configurations where measurement points use different interface types.