Keysight N4691D Electronic Calibration Module (ECal), 26.5 GHz, 3.5 mm, 2-port

The Keysight N4691D is a 2-port electronic calibration (ECal) module that automates vector network analyzer calibration across DC to 26.5 GHz. Equipped with 3.5 mm connectors and internal memory for calibration data, this module eliminates manual calibration steps, reducing setup errors and improving measurement repeatability. VNA control via compatible software enables fast, accurate calibration in laboratory and production test environments.

Technical Specifications

• Frequency Range: DC to 26.5 GHz


• Number of Ports: 2-port


• Connector Type: 3.5 mm


• Impedance: 50 Ohms nominal


• Calibration Type: Full 2-port calibration (SOLT, S2P, dependent on VNA compatibility)


• Data Storage: Internal memory for calibration data


• Operation: Automated, controlled via compatible VNA software

Key Features

• Automated calibration controlled directly from the VNA interface


• Reduces manual calibration steps and associated operator error


• Internal memory stores calibration coefficients and reference data


• Full 2-port calibration capability with standard methods


• 50 Ohm impedance matching for standard RF applications

Typical Applications

• Benchtop vector network analyzer calibration


• Production line VNA verification and re-calibration


• Laboratory RF and microwave characterization


• Time-critical measurement environments requiring rapid calibration cycles

Compatibility & Integration The N4691D is compatible with Keysight VNAs equipped with ECal functionality. Operation requires compatible VNA control software; specific VNA models and firmware versions should be verified prior to deployment to ensure full compatibility and proper calibration coefficient loading.