EN 3475-810:2009

Aerospace series - Cables, electrical, aircraft use - Test methods - Part 810: Structural return loss

This standard specifies methods for measuring structural return loss for digital data transmission cable.
It shall be used together with EN 3475-100.

Luft- und Raumfahrt - Elektrische Leitungen für Luftfahrtverwendung - Prüfverfahren - Teil 810: Rückfluβdämpfung

Diese Norm legt Verfahren zur Messung der Rückflussdämpfung für Leitungen zur Digitaldatenübertragung fest.
Sie ist in Verbindung mit EN 3475-100 anzuwenden.

Série aérospatiale - Câbles électriques à usage aéronautique - Méthodes d'essais - Partie 810: Affaiblissement de réflexion structurel

Aeronavtika - Električni kabli za uporabo v zračnih plovilih - Preskusne metode - 810. del: Povratna izguba (SRL)

General Information

• Status: Withdrawn
• Publication Date: 24-Feb-2009
• Withdrawal Date: 30-Dec-2025
• ICS: 49.060 - Aerospace electric equipment and systems
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 2 - Electrical
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 25-Feb-2009
• Completion Date: 25-Feb-2009
• Ref Project: SIST EN 3475-810:2009 - Aerospace series - Cables, electrical, aircraft use - Test methods - Part 810: Structural return loss

Relations

• Replaced By: EN 3475-810:2025 - Aerospace series - Cables, electrical, aircraft use - Test methods - Part 810: Structural return loss
• Effective Date: 09-Nov-2022

Overview

EN 3475-810:2009 is a European aerospace standard that specifies test methods for measuring structural return loss (SRL) in digital data transmission cables used in aircraft. As part of the EN 3475 aerospace cable series, this standard focuses on electrical cables designed for aircraft use, providing a specific method to quantify signal reflections caused by the cable structure itself. It is intended to be used alongside EN 3475-100, which provides general test methods for aerospace cables.

Structural return loss testing is essential to ensure reliable data transmission by minimizing signal degradation in aerospace environments. This standard supports manufacturers and testing laboratories by defining precise measurement procedures, calculation methods, and equipment requirements.

Key Topics

• Scope: Defines methods for evaluating structural return loss in aircraft digital data cables, critical for assessing cable performance and integrity.
• Test Specimens: Minimum cable length of 100 meters is required, with proper preservation of cable pair or quad assembly during preparation.
• Test Equipment:
  • High-Frequency (HF) Network Analyser for impedance measurements.
  • Impedance transformer (balun) to enable balanced measurements on cable pairs.
• Measurement Methods:
  • Structural return loss is calculated from complex impedance measurements obtained under open and short circuit conditions.
  • The characteristic impedance of the cable is fitted using a frequency-dependent formula.
  • The formula for SRL calculation translates impedance variation into decibel values representing reflection loss.
• Calculation Details: The standard outlines mathematical formulas for fitting characteristic impedance and calculating SRL, essential for interpreting test results accurately.
• Requirements: SRL values must comply with limits specified in the corresponding product standards to ensure cables meet performance expectations.

Applications

EN 3475-810:2009 is primarily applied in the aerospace industry to guarantee the electrical performance of cables used in aircraft data transmission systems. Key application areas include:

• Aircraft Wiring Systems: Ensures digital communications cables meet performance criteria for minimal signal reflection and maximum data integrity.
• Quality Control and Certification: Cable manufacturers use this standard during production and final inspection to verify conformance with aerospace requirements.
• System Integration: Assists aerospace engineers in selecting cables that maintain high reliability for avionics and digital control systems.
• Research and Development: Supports development of new cable designs with improved signal transmission characteristics for next-generation aircraft.

Incorporating SRL testing reduces risk of signal loss and electromagnetic interference, which are critical factors in sophisticated aircraft control and communication systems.

Related Standards

• EN 3475-100: Aerospace series - Cables, electrical, aircraft use - Test methods - Part 100: General test methods, which provides the framework within which EN 3475-810 must be used.
• EN 3475-805: Aerospace series - Cables, electrical, aircraft use - Test methods - Part 805: Characteristic impedance, supplying methods related to impedance measurement essential for SRL calculations.
• Additional aerospace cable and aircraft wiring standards from the EN 3475 series, governing various mechanical, electrical, and environmental testing procedures.

Summary

EN 3475-810:2009 is a vital standard for aerospace cable manufacturers and testing facilities, detailing accurate methods to assess structural return loss in aircraft digital data cables. By applying this standard in combination with EN 3475-100 and related parts, stakeholders ensure cables meet stringent aerospace performance criteria, enhancing data transmission reliability in demanding aviation environments.

Keywords: Aerospace cable testing, structural return loss, digital data transmission cable, aircraft electrical cables, EN 3475-810, impedance measurement, cable quality control, aerospace wiring standards.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Série aérospatiale - Câbles électriques à usage aéronautique - Méthodes d'essais - Partie 810: Affaiblissement de réflexion structurelAerospace series - Cables, electrical, aircraft use - Test methods - Part 810: Structural return loss49.060Aerospace electric equipment and systemsICS:Ta slovenski standard je istoveten z:EN 3475-810:2009SIST EN 3475-810:2009en01-maj-2009SIST EN 3475-810:2009SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 3475-810February 2009ICS 49.060 English VersionAerospace series - Cables, electrical, aircraft use - Testmethods - Part 810: Structural return lossSérie aérospatiale - Câbles électriques à usageaéronautique - Méthodes d'essais - Partie 810:Affaiblissement de réflexion structurelLuft- und Raumfahrt - Elektrische Leitungen fürLuftfahrtverwendung - Prüfverfahren - Teil 810:RückflußdämpfungThis European Standard was approved by CEN on 11 July 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre:
Avenue Marnix 17,
B-1000 Brussels© 2009 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3475-810:2009: ESIST EN 3475-810:2009
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