prEN 3475-812

Aerospace series - Cables, electrical, aircraft use - Test methods - Part 812: Return loss (VSWR)

This document specifies methods for measuring return loss 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.
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

Diese Norm 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.
Sie gilt zusammen mit EN 3475 100 und EN 50289 1 11. Insbesondere werden die in EN 50289 1 11, Anhang B, genau angegebenen Korrekturverfahren empfohlen, 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

No Scope available

Aeronavtika - Električni kabli za uporabo v zračnih plovilih - Preskusne metode - 812. del: Povratna izguba (VSWR)

General Information

• Status: Not Published
• Publication Date: 27-Oct-2026
• ICS: 49.060 - Aerospace electric equipment and systems
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 2/S 2 - Cables & Stripping Tools
• Current Stage: 4020 - Submission to enquiry - Enquiry
• Start Date: 01-May-2025
• Completion Date: 01-May-2025
• Ref Project: oSIST prEN 3475-812:2025 - Aerospace series - Cables, electrical, aircraft use - Test methods - Part 812: Return loss (VSWR)

Relations

• Revises: EN 3475-812:2009 - Aerospace series - Cables, electrical, aircraft use - Test methods - Part 812: Return loss (VSWR)
• Effective Date: 08-Jan-2025

Standards Content (Sample)

SLOVENSKI STANDARD
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
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.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Preparation of specimens .
...