EN 3475-810:2025
(Main)Aerospace series - Cables, electrical, aircraft use - Test methods - Part 810: Structural return loss
Aerospace series - Cables, electrical, aircraft use - Test methods - Part 810: Structural return loss
This document specifies methods for measuring the structural return loss of symmetrical cables for digital data transmission.
It is applicable together with EN 3475-100 and EN 50289-1-11. Attention is drawn in particular to correction procedures detailed in EN 50289-1-11:2016, Annex B, to minimize negative effects of cable preparation in the purpose of high frequency range measurements.
Luft- und Raumfahrt - Elektrische Leitungen für Luftfahrtverwendung - Prüfverfahren - Teil 810: Strukturelle Rückflussdämpfung
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
- Published
- Publication Date
- 23-Dec-2025
- Technical Committee
- ASD-STAN - Aerospace
- Drafting Committee
- ASD-STAN/D 2/S 2 - Cables & Stripping Tools
- Current Stage
- 6060 - Definitive text made available (DAV) - Publishing
- Start Date
- 24-Dec-2025
- Completion Date
- 24-Dec-2025
Relations
- Effective Date
- 09-Nov-2022
Overview
EN 3475-810:2025 - "Aerospace series - Cables, electrical, aircraft use - Test methods - Part 810: Structural return loss" defines methods for measuring the structural return loss (SRL) of symmetrical cables used for digital data transmission in aerospace applications. The standard explains how to derive SRL from measured complex impedance (open/short) and fitted characteristic impedance, and it gives practical guidance for high-frequency measurements and specimen preparation.
Key topics and requirements
- Scope: Measurement methods for SRL of balanced cable pairs/quad for digital data transmission; intended to be used together with EN 3475-100 and EN 50289-1-11.
- Structural return loss (SRL): A parameter that quantifies reflected signal level due to structural effects of the cable relative to its characteristic impedance (Zc). SRL is sensitive to how characteristic impedance is centered about the load impedance.
- Specimen preparation: Test specimens shall be at least 100 m long. Cable ends must be prepared so pair/quad assembly is maintained. Measurements may be taken on production drums or final delivery packages from one direction.
- Apparatus: Typical equipment includes a HF network analyser and an appropriate impedance transformer (balun) to allow balanced measurements representative of the pair under test.
- Measurement method: SRL is a calculated parameter based on measured complex impedance from open and short circuits (see EN 3475-805 Method C). The fitted characteristic impedance is computed from measured points across frequency, then SRL is calculated using the specified formula.
- Corrections: Correction procedures in EN 50289-1-11:2016, Annex B are recommended to minimize negative effects of cable preparation during high-frequency measurements.
- Requirements: Measured SRL values shall not exceed limits specified in the applicable product standard.
Applications and users
This standard is essential for:
- Aerospace cable manufacturers performing production and acceptance testing.
- Test laboratories and OEMs conducting quality assurance and performance validation of data cables for aircraft.
- Design and systems engineers validating signal integrity for high-speed digital links in avionics.
- Certification and procurement teams verifying compliance with product standards and procurement specifications.
Practical uses include production-line quality control, acceptance testing of drums and delivered cable, troubleshooting signal reflections at high frequency, and validating characteristic impedance and return loss performance for avionics data links.
Related standards
- EN 3475-100 - Test methods - General
- EN 3475-805 - Characteristic impedance (method references used for SRL calculation)
- EN 50289-1-11:2016 - Communication cables - Test methods (characteristic/input impedance, return loss) - includes Annex B correction procedures
Keywords: EN 3475-810:2025, structural return loss, SRL, aerospace cables, cable test methods, characteristic impedance, HF network analyser, balun, return loss measurement.
Frequently Asked Questions
EN 3475-810:2025 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Cables, electrical, aircraft use - Test methods - Part 810: Structural return loss". This standard covers: This document specifies methods for measuring the structural return loss of symmetrical cables for digital data transmission. It is applicable together with EN 3475-100 and EN 50289-1-11. Attention is drawn in particular to correction procedures detailed in EN 50289-1-11:2016, Annex B, to minimize negative effects of cable preparation in the purpose of high frequency range measurements.
This document specifies methods for measuring the structural return loss of symmetrical cables for digital data transmission. It is applicable together with EN 3475-100 and EN 50289-1-11. Attention is drawn in particular to correction procedures detailed in EN 50289-1-11:2016, Annex B, to minimize negative effects of cable preparation in the purpose of high frequency range measurements.
EN 3475-810:2025 is classified under the following ICS (International Classification for Standards) categories: 49.060 - Aerospace electric equipment and systems. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 3475-810:2025 has the following relationships with other standards: It is inter standard links to EN 3475-810:2009. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 3475-810:2025 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-februar-2026
Aeronavtika - Električni kabli za uporabo v zračnih plovilih - Preskusne metode -
810. del: Povratna izguba (SRL)
Aerospace series - Cables, electrical, aircraft use - Test methods - Part 810: Structural
return loss
Luft- und Raumfahrt - Elektrische Leitungen für Luftfahrtverwendung - Prüfverfahren -
Teil 810: Rückflussdämpfung
Série aérospatiale - Câbles électriques à usage aéronautique - Méthodes d’essais -
Partie 810: Affaiblissement de réflexion structurel
Ta slovenski standard je istoveten z: EN 3475-810:2025
ICS:
29.060.20 Kabli Cables
49.060 Letalska in vesoljska Aerospace electric
električna oprema in sistemi equipment and systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 3475-810
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2025
EUROPÄISCHE NORM
ICS 49.060 Supersedes EN 3475-810:2009
English Version
Aerospace series - Cables, electrical, aircraft use - Test
methods - Part 810: Structural return loss
Série aérospatiale - Câbles électriques à usage Luft- und Raumfahrt - Elektrische Leitungen für
aéronautique - Méthodes d'essais - Partie 810: Luftfahrtverwendung - Prüfverfahren - Teil 810:
Affaiblissement de réflexion structurel Strukturelle Rückflussdämpfung
This European Standard was approved by CEN on 17 November 2025.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC 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
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 3475-810:2025 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Preparation of specimens . 4
5 Methods .
...
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