Keysight (Agilent) N4431B RF Electronic Calibration Module, 9 kHz to 13.5 GHz

The Keysight (Agilent) N4431B RF Electronic Calibration Module automates VNA calibration across 9 kHz to 13.5 GHz using single-connection electronic calibration. This 4-port ECal module eliminates the time and operator error inherent in mechanical calibration methods, delivering NIST-traceable accuracy with highly repeatable impedance states and solid-state switching reliability. A single USB connection to Keysight PNA, ENA, or FieldFox instruments performs complete 3- or 4-port calibration instantly.

The module transfers factory calibration data directly to the analyzer, significantly reducing connector wear and calibration cycle time. Operating across 0 to 55°C, the N4431B maintains stable performance in lab and field environments.

Technical Specifications

• Frequency Range: 9 kHz to 13.5 GHz


• Impedance: 50 ohms


• Port Configuration: 4-port


• Connectors: Available in 3.5 mm, Type-N 50 ohm, and 7-16 DIN configurations (mixed-connector options supported)


• Control Interface: USB


• Operating Temperature: 0 to 55°C


• Dimensions: 19.0 cm × 25.4 cm × 7.6 cm


• Weight: 2.2 kg

Key Features

• Single-connection calibration for both 3- and 4-port measurements


• NIST-traceable calibration accuracy


• Highly repeatable impedance states via solid-state switching


• Minimal connector wear compared to mechanical kits


• Significantly faster calibration than traditional methods

Compatibility & Integration

• Supported Instruments: Keysight PNA, ENA, and FieldFox series


• Firmware Requirements: PNA Series Revision 2.5 or higher; ENA Series - for capabilities below 300 kHz


• Calibration Kit Compatibility: 85050, 85052, 85054, 85056, 85057, 85054B, 85056B, 85057B, 85058B, 85059B


• Available Configurations: N4431B-010 (four 3.5 mm), N4431B-020 (four Type-N), mixed-connector options including N4431B-101 (Port A: 3.5 mm) and additional port variants