EN 2591-224:2007

Overview

EN 2591-224:2007 is a European standard published by CEN that defines a precise test method for measuring the total radio frequency (RF) leakage in wired coaxial connectors used in aerospace applications. As part of the aerospace series of standards on electrical and optical connection elements, this standard focuses exclusively on RF leakage detection to ensure connector integrity and performance in demanding aerospace environments. It must be used in conjunction with EN 2591-100, which outlines general test methods for such components.

This standard is vital for manufacturers, engineers, and quality control teams aiming to guarantee the electromagnetic compatibility (EMC) and signal integrity in aerospace electrical systems that rely on coaxial connectors.

Key Topics

• Scope of Measurement
  EN 2591-224 specifies testing for total RF leakage in mated coaxial connector pairs. It measures leakage occurring both at the connector interface and at cable clamp points.

• Test Assembly Preparation
  The standard provides detailed instructions on assembling the connector test setup, including the use of specially machined brass tubing to ensure proper coaxial braid connection and minimize interference.

• Required Apparatus
  Equipment must include a calibrated RF source covering frequencies from 500 MHz to 11 GHz, a sensitive microwave receiver, and a triaxial test setup capable of measuring very low RF leakage down to -100 dBm. Use of RF amplifiers can extend the dynamic range.

• Testing Methodology
  The method involves measuring insertion loss caused by the triaxial assembly insertion and adjusting a shorting plunger to maximize detector readings. The setup ensures matching to 50 Ω impedance and proper low impedance behind the equivalent leakage generator.

• Calculation of Leakage Values
  Total RF leakage is quantified through power ratios and relative leakage voltages, comparing detected leakage power against internal power flow. Results must conform to product-specific leakage requirements.

• Normative References
  The test method requires reference to EN 2591-100 for overarching test standards applicable to electrical and optical connector elements.

Applications

• Aerospace Connector Qualification
  Ensuring coaxial connectors meet stringent RF leakage limits to maintain signal integrity and reduce electromagnetic interference (EMI) risks.

• Quality Control and Production Testing
  Routine inspection of connector batches in manufacturing lines to verify compliance with aerospace standards and prevent field failures.

• Design Validation
  Testing new coaxial connector designs for RF leakage performance before certification and deployment in aerospace systems.

• EMC Compliance
  RF leakage measurement contributes to electromagnetic compatibility assessments, a critical factor in aerospace electronic equipment certification.

Related Standards

• EN 2591-100 – Aerospace series - Elements of electrical and optical connection - Test methods - Part 100: General requirements and methods. EN 2591-224 depends on this standard for generalized test procedures.

• EN 2591 Series – Comprehensive aerospace-focused standards for electrical and optical connection elements, covering mechanical and electrical testing.

• IEC 60512 – Connectors for electronic equipment - Tests and measurements. While broader in scope, some general test principles align with EN 2591 series standards.

• MIL-DTL-38999 – Military specification for circular connectors often used in aerospace applications, addressing performance including leakage.

Summary

EN 2591-224:2007 provides aerospace industry stakeholders with a rigorous, standardized method to measure RF leakage in coaxial connectors, ensuring high reliability in electrically demanding environments. Its detailed procedures, combined with high-precision apparatus requirements, support critical testing for aerospace electrical and electronic systems, enabling safer and more efficient aerospace communication and power distribution.