EN 3475-811:2009
(Main)Aerospace series - Cables, electrical, aircraft use - Test methods - Part 811: Unbalance attenuation
Aerospace series - Cables, electrical, aircraft use - Test methods - Part 811: Unbalance attenuation
This standard specifies methods for measuring unbalance attenuation signal in common mode converted into differential mode caused by the characteristics of symmetry of transmission cables. Terms relative to this attenuation are defined in Clause 3.
It shall be used together with EN 3475-100.
Luft- und Raumfahrt - Elektrische Leitungen für Luftfahrtverwendung - Prüfverfahren - Teil 811: Unsymmetriedämpfung
Série aérospatiale - Câbles électriques à usage aéronautique - Méthode d'essai - Partie 811: Affaiblissement de dissymétrie
Aeronavtika - Električni kabli za uporabo v zračnih plovilih - Preskusne metode - 811. del: Neenakomerno slabljenje
General Information
- Status
- Published
- Publication Date
- 10-Mar-2009
- Withdrawal Date
- 29-Sep-2009
- 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
- 28-Jan-2026
Relations
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
Overview
EN 3475-811:2009 - part of the CEN aerospace series - defines test methods to measure unbalance attenuation in aircraft transmission cables. It quantifies how common‑mode signals are converted into differential signals because of cable asymmetry. The standard specifies measurement definitions, specimen preparation, test apparatus and measurement procedures for the two main metrics: longitudinal conversion loss (LCL) and longitudinal conversion transfer loss (LCTL). EN 3475-811:2009 is intended to be used together with EN 3475-100 (general test method requirements).
Key topics and requirements
- Scope and terms: Defines LCL (near‑end conversion) and LCTL (far‑end conversion) as logarithmic ratios of injected common‑mode to resulting differential signals.
- Specimen preparation: Test specimens shall be (100 ± 1) m long; pair/quad assembly must be maintained. For unscreened twisted pair cables a defined return common‑mode path is mandatory (e.g., earth unused pairs or use an earthed metal drum).
- Apparatus:
- High‑frequency Network Analyser
- Two 3‑port baluns (impedance transformers with centre tap)
- Coaxial cables and resistor terminations
- Balun performance (required characteristics reported in the standard):
- Primary: 50 Ω unbalanced; Secondary: 100 Ω balanced
- Insertion loss ≤ 3 dB; return loss (secondary) ≥ 20 dB
- Longitudinal balance ≥ 60 dB; common‑mode rejection ≥ 50 dB
- Calibration:
- Reference line calibration using the same coaxial leads
- Back‑to‑back balun insertion loss measurements yield Ilbal,DM and Ilbal,CM
- Correction factor: Cor_LCLcal = 3 dB − Ilbal,DM − Ilbal,CM
- Measurement methods:
- LCL: common‑mode injected at near end, differential measured at near end
- LCTL: common‑mode injected at near end, differential measured at far end
- Pass/fail: Measured LCL/LCTL values must not exceed limits specified in the applicable product standard.
Applications and users
- Aerospace cable manufacturers validating cable symmetry and EMC performance
- Test laboratories performing compliance and qualification testing on aircraft wiring
- Aerospace system integrators evaluating signal integrity and common‑mode conversion risks
- Engineering teams concerned with EMI/EMC, data link integrity, and safety‑critical wiring
Related standards
- EN 3475-100 (Aerospace series - Cables, electrical, aircraft use - Test methods - Part 100: General) - to be used in conjunction with EN 3475-811:2009
- Other EN 3475 parts covering mechanical, environmental and electrical test methods for aerospace cables
Keywords: EN 3475-811:2009, unbalance attenuation, LCL, LCTL, aerospace cables, test methods, balun, common mode to differential conversion, cable symmetry, aircraft wiring testing.
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Frequently Asked Questions
EN 3475-811:2009 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Cables, electrical, aircraft use - Test methods - Part 811: Unbalance attenuation". This standard covers: This standard specifies methods for measuring unbalance attenuation signal in common mode converted into differential mode caused by the characteristics of symmetry of transmission cables. Terms relative to this attenuation are defined in Clause 3. It shall be used together with EN 3475-100.
This standard specifies methods for measuring unbalance attenuation signal in common mode converted into differential mode caused by the characteristics of symmetry of transmission cables. Terms relative to this attenuation are defined in Clause 3. It shall be used together with EN 3475-100.
EN 3475-811:2009 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 3475-811:2009 has the following relationships with other standards: It is inter standard links to EN 2267-010:2013, EN 4199-001:2013, EN 4608-004:2015, EN 2713-002:2006, EN 3375-011:2017, EN 2713-007:2005, EN 4611-004:2018, EN 2267-009:2017, EN 4651:2014, EN 2713-011:2006, EN 3375-011:2022, EN 2084:2018, EN 2714-004:2006, EN 4611-007:2012, EN 2713-012:2017. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 3475-811:2009 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 811: UnsymmetriedämpfungSérie aérospatiale - Câbles électriques à usage aéronautique - Méthode d'essai - Partie 811: Affaiblissement de dissymétrieAerospace series - Cables, electrical, aircraft use - Test methods - Part 811: Unbalance attenuation49.060Aerospace electric equipment and systemsICS:Ta slovenski standard je istoveten z:EN 3475-811:2009SIST EN 3475-811:2009en01-junij-2009SIST EN 3475-811:2009SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 3475-811March 2009ICS 49.060 English VersionAerospace series - Cables, electrical, aircraft use - Testmethods - Part 811: Unbalance attenuationSérie aérospatiale - Câbles électriques à usageaéronautique - Méthode d'essai - Partie 811:Affaiblissement de dissymétrieLuft- und Raumfahrt - Elektrische Leitungen fürLuftfahrtverwendung - Prüfverfahren - Teil 811:UnsymmetriedämpfungThis European Standard was approved by CEN on 30 August 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 3475-811:2009: ESIST EN 3475-811:2009
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