kSIST FprEN 3475-812:2026
(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 document specifies methods for measuring return loss and respectively voltage standing wave ratio (VSWR), in the required frequency range of coaxial cables.
The return loss is used for quantifying the level of the reflected signal due to an impedance mismatch between the cable and the reference impedance, and due to structural variations of the impedance along the cable.
It is intended to be used together with EN 3475-100 and EN 50289-1-11:2016.
NOTE In particular, correction procedures detailed in EN 50289-1-11:2016, Annex B are important to minimize negative effects of cable preparation in the purpose of high frequency range measurements.
Luft- und Raumfahrt - Elektrische Leitungen für Luftfahrtanwendung - Prüfverfahren - Teil 812: Rückflussdämpfung
Dieses Dokument legt Verfahren zur Messung der Rückflussdämpfung bzw. des Stehwellenverhältnisses (VSWR) im erforderlichen Frequenzbereich von koaxialen Leitungen fest.
Die Rückflussdämpfung wird zur quantitativen Bestimmung des Pegels des reflektierten Signals aufgrund einer Impedanzfehlanpassung zwischen der Leitung und der Bezugsimpedanz und aufgrund von strukturellen Impedanzschwankungen entlang der Leitung angewendet.
Es soll zusammen mit EN 3475-100 und EN 50289-1-11:2016 angewendet werden.
ANMERKUNG Insbesondere sind die in EN 50289-1-11:2016, Anhang B, genau angegebenen Korrekturverfahren wichtig, um die negativen Auswirkungen der Vorbereitung der Leitung bei Messungen im Hochfrequenzbereich auf ein Mindestmaß zu verringern.
Série aérospatiale - Câbles électriques à usage aéronautique - Méthodes d'essais - Partie 812 : Affaiblissement de réflexion
Le présent document spécifie des méthodes pour mesurer l'affaiblissement de réflexion et le rapport d'ondes stationnaires (ROS) respectif, dans la gamme de fréquences requise des câbles coaxiaux.
L'affaiblissement de réflexion est utilisé pour quantifier le niveau du signal réfléchi dû à une désadaptation d’impédance entre le câble et l’impédance de référence, et dû à des variations structurelles de l'impédance le long du câble.
Il est destiné à être utilisé conjointement avec l’EN 3475-100 et l’EN 50289-1-11:2016.
NOTE En particulier, les procédures de correction détaillées dans l’EN 50289-1-11:2016, Annexe B sont importantes pour minimiser les effets négatifs de la préparation des câbles dans le but de mesurer la gamme des hautes fréquences.
Aeronavtika - Električni kabli za uporabo v zračnih plovilih - Preskusne metode - 812. del: Povratna izguba (VSWR)
General Information
- Status
- Not Published
- Public Enquiry End Date
- 23-Jul-2025
- Technical Committee
- I13 - Imaginarni 13
- Current Stage
- 5020 - Formal vote (FV) (Adopted Project)
- Start Date
- 11-May-2026
- Due Date
- 29-Jun-2026
- Completion Date
- 11-May-2026
Relations
- Effective Date
- 08-Jan-2025
Overview
kSIST FprEN 3475-812:2026 is a crucial standard in the aerospace industry, developed by SIST, specifying standardized test methods for measuring return loss and voltage standing wave ratio (VSWR) in coaxial cables used in aircraft electrical systems. The return loss measurement provides vital data on the level of signal reflection caused by impedance mismatches or structural variations within the cable, directly affecting system performance and reliability. This standard ensures consistent and accurate testing practices, supporting the safe and efficient operation of aircraft electrical systems.
Key Topics
- Return Loss Testing: Outlines procedures for quantifying the level of reflected signals in coaxial cables, an essential metric for cable quality and system efficiency in aerospace applications.
- VSWR (Voltage Standing Wave Ratio): Specifies the calculation method for VSWR, a key indicator of the degree of mismatch between the cable and reference impedance.
- Specimen Preparation: Sets guidelines for preparing 10-meter cable samples, including the proper fitting of connectors and recommended verification of connection quality using time domain reflection measurements.
- Use of Reference Standards: Requires joint application with related standards, especially EN 3475-100 and EN 50289-1-11:2016, to ensure comprehensive and accurate high-frequency measurements.
- Correction Procedures: Highlights the importance of correction methods, particularly those in Annex B of EN 50289-1-11:2016, to minimize errors due to cable preparation.
Applications
kSIST FprEN 3475-812:2026 is applicable in various scenarios within the aerospace sector, including:
- Aircraft Cable Testing: Used by manufacturers and maintenance organizations to verify the performance of coaxial cables before installation or during routine inspections. Ensures minimal signal degradation and optimal electromagnetic compatibility.
- Quality Assurance: Supports engineers and quality auditors in ensuring that cables meet strict aerospace requirements for impedance and signal integrity.
- Design and Development: Provides essential methods for R&D teams developing new types of coaxial cables or electrical systems for modern aircraft, ensuring compliance with industry benchmarks.
- Component Certification: Enables certification bodies to assess conformance to standardized return loss and VSWR values, a critical part of product approval processes for aerospace electrical components.
- Maintenance and Repair: Guides maintenance personnel in evaluating existing cabling systems, helping to detect and address potential impedance mismatches that could compromise aircraft safety or communication clarity.
Related Standards
Comprehensive and compliant testing according to kSIST FprEN 3475-812:2026 should reference the following key standards:
- EN 3475-100: Aerospace series - Cables, electrical, aircraft use - Test methods - Part 100: General. Sets the foundational requirements and general procedures for cable testing in aerospace systems.
- EN 50289-1-11:2016: Communication cables - Specifications for test methods - Part 1-11: Electrical test methods - Characteristic impedance, input impedance, return loss. Defines detailed electrical test methods, including correction procedures essential for minimizing errors in high-frequency measurements.
- EN 3475-805: Aerospace series - Cables, electrical, aircraft use - Test methods - Part 805: Characteristic impedance. Provides associated methods for measuring characteristic impedance, directly linked to return loss assessment.
Practical Value
Implementing kSIST FprEN 3475-812:2026 guarantees standardized, reliable methods for return loss and VSWR testing in aerospace cable systems. This not only ensures robust signal transmission and system reliability but also simplifies compliance and certification for manufacturers and operators. Adhering to this standard supports product quality, longevity, and safe operation within demanding aerospace environments.
Get Certified
Connect with accredited certification bodies for this standard
BUREAU VERITAS Certification Germany
Bureau Veritas certification in Germany.
Element Materials Technology
Materials testing and product certification.
IMQ S.p.A. (Certification)
Italian electrical product certification.
Sponsored listings
Frequently Asked Questions
kSIST FprEN 3475-812:2026 is a draft published by the Slovenian Institute for Standardization (SIST). Its full title is "Aerospace series - Cables, electrical, aircraft use - Test methods - Part 812: Return loss (VSWR)". This standard covers: This document specifies methods for measuring return loss and respectively voltage standing wave ratio (VSWR), in the required frequency range of coaxial cables. The return loss is used for quantifying the level of the reflected signal due to an impedance mismatch between the cable and the reference impedance, and due to structural variations of the impedance along the cable. It is intended to be used together with EN 3475-100 and EN 50289-1-11:2016. NOTE In particular, correction procedures detailed in EN 50289-1-11:2016, Annex B are important to minimize negative effects of cable preparation in the purpose of high frequency range measurements.
This document specifies methods for measuring return loss and respectively voltage standing wave ratio (VSWR), in the required frequency range of coaxial cables. The return loss is used for quantifying the level of the reflected signal due to an impedance mismatch between the cable and the reference impedance, and due to structural variations of the impedance along the cable. It is intended to be used together with EN 3475-100 and EN 50289-1-11:2016. NOTE In particular, correction procedures detailed in EN 50289-1-11:2016, Annex B are important to minimize negative effects of cable preparation in the purpose of high frequency range measurements.
kSIST FprEN 3475-812:2026 is classified under the following ICS (International Classification for Standards) categories: 29.060.20 - Cables; 49.060 - Aerospace electric equipment and systems. The ICS classification helps identify the subject area and facilitates finding related standards.
kSIST FprEN 3475-812:2026 has the following relationships with other standards: It is inter standard links to SIST EN 3475-812:2009. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
kSIST FprEN 3475-812:2026 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
oSIST prEN 3475-812:2025
01-julij-2025
Aeronavtika - Električni kabli za uporabo v zračnih plovilih - Preskusne metode -
812. del: Povratna izguba (VSWR)
Aerospace series - Cables, electrical, aircraft use - Test methods - Part 812: Return loss
(VSWR)
Luft- und Raumfahrt - Elektrische Leitungen für Luftfahrtanwendung - Prüfverfahren - Teil
812: Rückflussdämpfung
Série aérospatiale - Câbles électriques à usage aéronautique - Méthodes d'essais -
Partie 812 : Affaiblissement de réflexion
Ta slovenski standard je istoveten z: prEN 3475-812
ICS:
29.060.20 Kabli Cables
49.060 Letalska in vesoljska Aerospace electric
električna oprema in sistemi equipment and systems
oSIST prEN 3475-812:2025 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
oSIST prEN 3475-812:2025
oSIST prEN 3475-812:2025
DRAFT
EUROPEAN STANDARD
prEN 3475-812
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2025
ICS 49.060 Will supersede EN 3475-812:2009
English Version
Aerospace series - Cables, electrical, aircraft use - Test
methods - Part 812: Return loss (VSWR)
Série aérospatiale - Câbles électriques à usage Luft- und Raumfahrt - Elektrische Leitungen für
aéronautique - Méthodes d'essais - Partie 812 : Luftfahrtanwendung - Prüfverfahren - Teil 812:
Affaiblissement de réflexion Rückflussdämpfung
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee ASD-
STAN.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
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. prEN 3475-812:2025 E
worldwide for CEN national Members.
oSIST prEN 3475-812:2025
prEN 3475-812:2025 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Preparation of specimens .
...