Keysight / Agilent / HP N4691B Electronic Calibration (ECal) Module for Vector Network Analyzer

The Keysight N4691B is a 2-port Electronic Calibration (ECal) module that automates vector network analyzer calibration from 300 kHz to 26.5 GHz. It replaces time-consuming mechanical calibration kits with solid-state switching and fully traceable electronic impedance standards, delivering NIST-traceable accuracy in a single connection. The module cuts calibration time to less than half that of conventional methods while eliminating operator errors and reducing connector wear.

Technical Specifications

Frequency Range: 300 kHz to 26.5 GHz

Ports: 2-port configuration

Connector Type: 3.5 mm

Calibration Technique: Single-connection, full two-port calibration

Switching Architecture: Solid-state switching

Standards: Fully traceable and verifiable electronic impedance standards

Measurement Traceability: NIST traceable

Key Features

Reduced Calibration Time: Calibration cycles complete in significantly less than half the time required for mechanical calibration kits.

Minimized Measurement Errors: Solid-state switching and characterized impedance standards eliminate manual calibration variability.

Extended Connector Life: Fewer physical connections reduce wear on VNA test ports.

Repeatable Results: Electronic standards provide consistent calibration accuracy across repeated measurements and multiple analyzers.

USB Control Interface: Direct connection to Keysight PNA and ENA series analyzers with automatic firmware recognition.

Compatibility & Integration The N4691B integrates natively with Keysight PNA and ENA series vector network analyzers via USB. Legacy support extends to Keysight 8753E/ES/ET and 8720D/ES/ET analyzers through the optional 85097B interface kit. Firmware automatically recognizes the ECal module upon connection, eliminating manual setup steps.

Typical Applications The module is a transfer standard for production calibration, multi-site calibration verification, and laboratory measurement traceability. It is suited for organizations requiring frequent VNA calibration with minimal downtime and high measurement confidence.