EN 3475-812:2009
(Main)Aerospace series - Cables, electrical, aircraft use - Test methods - Part 812: Return loss (VSWR)
Aerospace series - Cables, electrical, aircraft use - Test methods - Part 812: Return loss (VSWR)
This standard specifies methods for measuring return loss (VSWR), in the required frequency bandwith of
coaxial cables with characteristic impedance.
The return loss is used for quantifying the level of the reflected signal due to the irregularity of the
characteristic impedance of the cable.
It is intended to be used together with EN 3475-100.
Luft- und Raumfahrt - Elektrische Leitungen für Luftfahrtverwendung - Prüfverfahren - Teil 812: Rückflussdämpfung (VSWR)
Diese Norm legt Verfahren zur Messung der Rückflussdämpfung (VSWR) in der geforderten Frequenzbandbreite
von koaxialen Leitungen mit Wellenwiderstand fest.
Die Rückflussdämpfung dient der Bestimmung des Pegels des reflektierten Signals unter Berücksichtigung
des variierenden Wellenwiderstands der Leitung.
Die Norm ist in Verbindung mit EN 3475-100 anzuwenden.
Série aérospatiale - Câbles électriques à usage aéronautique - Méthodes d'essais - Partie 812: Affaiblissement de réflexion
Aeronavtika - Električni kabli za uporabo v zračnih plovilih - Preskusne metode - 812. del: Povratna izguba (VSWR)
General Information
- Status
- Published
- Publication Date
- 18-Aug-2009
- Withdrawal Date
- 27-Feb-2010
- 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 3475-812:2009 - "Aerospace series - Cables, electrical, aircraft use - Test methods - Part 812: Return loss (VSWR)" defines standardized procedures for measuring return loss / VSWR of coaxial aerospace cables with specified characteristic impedance. The standard is focused on quantifying reflected signal energy caused by impedance irregularities along the cable, measured over the frequency bandwidth required by the applicable product standard. EN 3475-812:2009 is intended to be used together with EN 3475-100 (general test method requirements).
Key topics and requirements
- Scope of measurement: Measurement of return loss (VSWR) across the frequency range specified in the product standard for the cable.
- Specimen preparation: Test specimens length is set by the product standard; connectors must be fitted at each end and validated prior to measurement.
- Connector verification: The VSWR/adaptation of connectors is checked using time-domain (temporal) response to ensure connector contribution is known and acceptable.
- Measurement method and apparatus: Measurements and equipment requirements follow EN 50289-1-11 (electrical test methods for characteristic impedance, input impedance, return loss).
- Acceptance criteria: Return loss values obtained in testing shall not exceed (i.e., shall meet) the limits specified in the product standard for that cable type. EN 3475-812 defines the method but defers numeric pass/fail limits to the product specification.
- Normative references: EN 3475-100 and EN 50289-1-11 are indispensable for correct application.
Practical applications
- Quality assurance and production testing of coaxial aircraft cables to ensure signal integrity and low reflection across the operational frequency band.
- Design verification and qualification testing for avionics and RF interconnects where impedance matching is critical.
- Failure analysis and troubleshooting of cable assemblies by identifying impedance discontinuities that cause reflections.
- Procurement and inspection criteria for aerospace manufacturers, OEMs, and subcontractors supplying electrical cables and assemblies.
- Use by accredited test laboratories performing compliance testing to aerospace standards and by certification bodies assessing hardware readiness.
Who uses this standard
- Aerospace cable manufacturers and assembly shops
- Test engineers and RF/avionics engineers
- Quality assurance and production test teams
- Certification and regulatory authorities
- Independent laboratories performing aerospace electrical testing
Related standards
- EN 3475-100 - Aerospace series: Cables, electrical - Test methods - Part 100: General.
- EN 50289-1-11 - Communication cables: Test methods - Characteristic impedance, input impedance, return loss.
Keywords: EN 3475-812:2009, return loss, VSWR, coaxial cables, aerospace cables, aircraft use, test methods, characteristic impedance, EN 3475-100, EN 50289-1-11.
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Frequently Asked Questions
EN 3475-812:2009 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Cables, electrical, aircraft use - Test methods - Part 812: Return loss (VSWR)". This standard covers: This standard specifies methods for measuring return loss (VSWR), in the required frequency bandwith of coaxial cables with characteristic impedance. The return loss is used for quantifying the level of the reflected signal due to the irregularity of the characteristic impedance of the cable. It is intended to be used together with EN 3475-100.
This standard specifies methods for measuring return loss (VSWR), in the required frequency bandwith of coaxial cables with characteristic impedance. The return loss is used for quantifying the level of the reflected signal due to the irregularity of the characteristic impedance of the cable. It is intended to be used together with EN 3475-100.
EN 3475-812:2009 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 3475-812:2009 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 3475-812:2009 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 fur Luftfahrtverwendung - Prufverfahren - Teil 812: RuckflussdampfungSérie aérospatiale - Câbles électriques à usage aéronautique - Méthodes d'essais - Partie 812: Affaiblissement de réflexionAerospace series - Cables, electrical, aircraft use - Test methods - Part 812: Return loss (VSWR)49.060Aerospace electric equipment and systemsICS:Ta slovenski standard je istoveten z:EN 3475-812:2009SIST EN 3475-812:2009en01-oktober-2009SIST EN 3475-812:2009SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 3475-812August 2009ICS 49.060 English VersionAerospace series - Cables, electrical, aircraft use - Testmethods - Part 812: Return loss (VSWR)Série aérospatiale - Câbles électriques à usageaéronautique - Méthodes d'essais - Partie 812:Affaiblissement de réflexionLuft- und Raumfahrt - Elektrische Leitungen furLuftfahrtverwendung - Prufverfahren - Teil 812:RuckflussdampfungThis European Standard was approved by CEN on 20 June 2009.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 3475-812:2009: ESIST EN 3475-812:2009
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