Aerospace series - Cables, electrical, aircraft use - Test methods - Part 809: Resistance unbalance

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

Luft- und Raumfahrt - Elektrische Leitungen für Luftfahrtverwendung - Prüfverfahren - Teil 809: Widerstandsunsymmetrie

Diese Norm legt Verfahren für die Messung der Widerstandsunsymmetrie 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 809: Déséquilibre de résistance

Aeronavtika - Električni kabli za uporabo v zračnih plovilih - Preskusne metode - 809. del: Neenakomernost upornosti

General Information

Status
Published
Publication Date
24-Mar-2009
Withdrawal Date
29-Sep-2009
ICS
49.060 - Aerospace electric equipment and systems
Technical Committee
ASD-STAN - Aerospace
Drafting Committee
ASD-STAN/D 2 - Electrical
Current Stage
9093 - Decision to confirm - Review Enquiry
Start Date
21-Jan-2025
Completion Date
11-Feb-2026
Ref Project
SIST EN 3475-809:2009 - Aerospace series - Cables, electrical, aircraft use - Test methods - Part 809: Resistance unbalance

Relations

Refers
EN 3475-301:2002 - Aerospace series - Cables, electrical, aircraft use - Test methods - Part 301: Ohmic resistance per unit length
Effective Date
28-Jan-2026
Refers
EN 3475-100:2010 - Aerospace series - Cables, electrical, aircraft use - Test methods - Part 100: General
Effective Date
28-Jan-2026
Referred By
EN 4604-010:2018 - Aerospace series - Cable, electrical, for signal transmission - Part 010 : Cable, coaxial, light weight, 50 Ohms, 200 °C, type KX (light WD) - Product standard
Effective Date
28-Jan-2026
Referred By
EN 4611-007:2018 - Aerospace series - Cables, electrical, for general purpose, single and multicore assembly - XLETFE Family - Part 007: Nickel plated copper - Operating temperatures, between - 65 °C and 150 °C - Dual extruded wall for open applications - UV laser printable - Product standard
Effective Date
28-Jan-2026
Referred By
EN 2234:2018 - Aerospace series - Cable, electrical, fire resistant - Technical specification
Effective Date
28-Jan-2026
Referred By
EN 4612-002:2019 - Aerospace series - Cables, electrical, for general purpose, single and multicore assembly - XLETFE Family - Jacketed or screened and jacketed - Part 002: Genera
Effective Date
28-Jan-2026
Referred By
EN 4604-003:2019 - Aerospace series - Cable, electrical, for signal transmission - Part 003: Cable, coaxial, 50 ohms, 200 °C, type WZ - Product standard
Effective Date
28-Jan-2026
Referred By
EN 2267-005:2006 - Aerospace series - Cables, electrical, for general purpose - Operating temperatures between - 55 °C and 260 °C - Part 005: UV laser printable - Product standard
Effective Date
28-Jan-2026
Referred By
EN 4612-008:2011 - Aerospace series - Cables, electrical, for general purpose, single and multicore assembly XLETFE Family jacketed or screened and jacketed - Part 008: Silver plated copper - Operating temperatures, between - 65 °C and 150 °C - single extruded wall for open applications, with jacket and screen (braid) - UV laser printable - Product standard
Effective Date
28-Jan-2026
Referred By
EN 4612-011:2011 - Aerospace series - Cables, electrical, for general purpose, single and multicore assembly - XLETFE Family - Jacketed or screened and jacketed - Part 011: Nickel plated copper - Operating temperatures, between - 65 °C and 150 °C - Dual extruded wall for open applications, with jacket without screen - UV laser printable - Product standard
Effective Date
28-Jan-2026
Referred By
EN 4604-007:2019 - Aerospace series - Cable, electrical, for signal transmission - Part 007: Cable, coaxial, 50 ohms, 200 °C, type WN - Product standard
Effective Date
28-Jan-2026
Referred By
EN 3375-011:2025 - Aerospace series - Cable, electrical for digital data transmission - Part 011: Single braid - Star Quad 100 ohms - Lightweight - Type KL - Product standard
Effective Date
28-Jan-2026
Referred By
EN 2714-006:2006 - Aerospace series - Cables, electrical, single and multicore for general purpose - Operating temperatures between - 55 °C and 260 °C - Part 006: Screened (braided) and jacketed, CO2 laser printable - Product standard
Effective Date
28-Jan-2026
Referred By
EN 3375-009:2009 - Aerospace series - Cable, electrical, for digital data transmission - Part 009: Single braid - CAN Bus - 120 Ohms - Type WX - Product standard
Effective Date
28-Jan-2026
Referred By
EN 4611-003:2018 - Aerospace series - Cables, electrical, for general purpose, single and multicore assembly - XLETFE Family - Part 003: Tin plated copper - Operating temperatures, between -65 °C and 135 °C - Single extruded wall for enclosed applications - UV laser printable - Product standard
Effective Date
28-Jan-2026

Overview

EN 3475-809:2009 is a CEN (ASD‑STAN) test-method standard for measuring resistance unbalance in digital data transmission cables for aircraft use. It is part of the aerospace series for electrical cables and is intended to be applied together with EN 3475-100 (general test methods). The standard defines specimen preparation, required apparatus, measurement method and calculation of percent resistance unbalance for conductor pairs (including quad cables).

Key topics and requirements

  • Scope: Test methods for measuring resistance unbalance on digital data transmission cable used in aerospace applications.
  • Specimen preparation: Measurements may be taken on production drums or on the final delivery package.
  • Apparatus: Precision resistance-measuring equipment such as Wheatstone bridges or automatic/semi‑automatic instruments with an accuracy of ±0.5%.
  • Temperature reference: Each conductor resistance shall be measured at, or corrected to, 20 °C. Temperature correction is performed as described in EN 3475-301 (ohmic resistance per unit length).
  • Calculation: Resistance unbalance for a conductor pair is expressed as a percent value derived from the resistances of the two conductors in the pair. For quad cables, two pair unbalances (DR1, DR2) are calculated separately. The percent unbalance is computed from the difference between the two conductor resistances normalized by their sum and multiplied by 100.
  • Requirement: The measured resistance unbalance shall not exceed the limits specified in the applicable product (cable) standard.

Practical applications and users

Who uses EN 3475-809:2009:

  • Aerospace cable manufacturers and suppliers - to qualify and batch‑test digital data transmission cable.
  • Aircraft and avionics OEMs - to verify cable conformity to procurement specifications.
  • Independent test laboratories - to perform standardized resistance unbalance measurements.
  • Quality assurance and manufacturing engineers - to ensure balanced-pair integrity for digital data links.

Why it matters:

  • Resistance unbalance between pair conductors can degrade signal integrity in high-speed digital data links used in avionics. Controlling unbalance supports reliable data transmission and compatibility with aircraft data systems.

Related standards

  • EN 3475-100 - General test methods for aerospace electrical cables (use in conjunction).
  • EN 3475-301 - Ohmic resistance per unit length and temperature correction procedures.

Keywords: EN 3475-809:2009, resistance unbalance, aerospace cables, digital data transmission cable, test methods, Wheatstone bridge, EN 3475-100, EN 3475-301, conductor resistance.

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Frequently Asked Questions

EN 3475-809:2009 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Cables, electrical, aircraft use - Test methods - Part 809: Resistance unbalance". This standard covers: This standard specifies methods for measuring resistance unbalance for digital data transmission cable. It shall be used together with EN 3475-100.

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

EN 3475-809:2009 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 3475-809:2009 has the following relationships with other standards: It is inter standard links to EN 3475-301:2002, EN 3475-100:2010, EN 4604-010:2018, EN 4611-007:2018, EN 2234:2018, EN 4612-002:2019, EN 4604-003:2019, EN 2267-005:2006, EN 4612-008:2011, EN 4612-011:2011, EN 4604-007:2019, EN 3375-011:2025, EN 2714-006:2006, EN 3375-009:2009, EN 4611-003:2018. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

EN 3475-809:2009 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)


2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Luft- und Raumfahrt - Elektrische Leitungen für Luftfahrtverwendung - Prüfverfahren - Teil 809: WiderstandsunsymmetrieSérie aérospatiale - Câbles électriques à usage aéronautique - Méthodes d'essais - Partie 809: Déséquilibre de résistanceAerospace series - Cables, electrical, aircraft use - Test methods - Part 809: Resistance unbalance49.060Aerospace electric equipment and systemsICS:Ta slovenski standard je istoveten z:EN 3475-809:2009SIST EN 3475-809:2009en01-junij-2009SIST EN 3475-809:2009SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 3475-809March 2009ICS 49.060 English VersionAerospace series - Cables, electrical, aircraft use - Testmethods - Part 809: Resistance unbalanceSérie aérospatiale - Câbles électriques à usageaéronautique - Méthodes d'essais - Partie 809:Déséquilibre de résistanceLuft- und Raumfahrt - Elektrische Leitungen fürLuftfahrtverwendung - Prüfverfahren - Teil 809:WiderstandsunsymmetrieThis 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 3475-809:2009: ESIST EN 3475-809:2009
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