FprEN 3475-805

Aerospace series - Cables, electrical, aircraft use - Test methods - Part 805: Characteristic impedance

This document specifies methods for measuring the characteristic impedance of a cable and is based on EN 50289 1 11:2016.

Luft- und Raumfahrt - Elektrische Leitungen für Luftfahrtverwendung - Prüfverfahren - Teil 805: Wellenwiderstand

Dieses Dokument legt Verfahren zum Messen des Wellenwiderstandes einer Leitung fest und basiert auf EN50289-1-11:2016.

Série aérospatiale - Câbles électriques à usage aéronautique - Méthodes d'essais - Partie 805 : Impédance caractéristique

Le présent document spécifie les méthodes de mesure de l'impédance caractéristique d'un câble et est basé sur l’EN 50289-1-11:2016.

Aeronavtika - Električni kabli za uporabo v zračnih plovilih - Preskusne metode - 805. del: Karakteristična impedanca

General Information

• Status: Not Published
• Publication Date: 20-Sep-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: 5020 - Submission to Vote - Formal Approval
• Start Date: 23-Apr-2026
• Completion Date: 23-Apr-2026
• Ref Project: oSIST prEN 3475-805:2023 - Aerospace series – Cables, electrical, aircraft use - Test methods - Part 805: Characteristic impedance

Relations

• Referred By: EN ISO/ASTM 52908:2023 - Additive manufacturing of metals - Finished Part properties - Post-processing, inspection and testing of parts produced by powder bed fusion (ISO/ASTM 52908:2023)
• Effective Date: 28-Jan-2026
• Referred By: EN ISO/ASTM 52935:2023 - Additive manufacturing of metals - Qualification principles - Qualification of coordination personnel (ISO/ASTM 52935:2023)
• Effective Date: 28-Jan-2026
• Revises: EN 3475-805:2002 - Aerospace series - Cables, electrical, aircraft use - Test methods - Part 805: Characteristic impedance
• Effective Date: 18-Jan-2023

Overview

FprEN 3475-805 is a European draft standard developed by CEN, part of the Aerospace series, focusing on electrical cables for aircraft use. This standard defines recognized test methods for determining the characteristic impedance of electrical cables used in aerospace applications. Based on EN 50289-1-11:2016, FprEN 3475-805 ensures the reliability and performance of cables in demanding aircraft environments by standardizing measurement processes.

Characteristic impedance is a critical parameter in the design and selection of aircraft cables, affecting signal integrity, power transmission, and electromagnetic compatibility. This document establishes consistent, repeatable procedures necessary for certification, quality assurance, and compliance in aerospace manufacturing and maintenance.

Key Topics

• Scope of Application: Procedures for measuring the characteristic impedance of cables intended for use in aircraft electrical systems.
• Measurement Methods:
  • Method A: Impedance bridge measurement on coaxial cables.
  • Method B: Reflectometer (e.g., TDR) measurement for coaxial cables.
  • Method C: Shielded symmetric cable measurement using specialized network analysis.
• Specimen Preparation: Guidelines for stripping and preparing cable specimens prior to impedance testing.
• Test Equipment: Requirements for measurement devices such as impedance bridges, reflectometers, network analyzers, and calibration standards.
• Calculations and Formulas: Standardized mathematical approaches for calculating characteristic impedance from measured values.

Applications

FprEN 3475-805 serves several practical roles within the aerospace and defense industries:

• Aerospace Cable Manufacturing: Provides cable manufacturers with authoritative test methods necessary for product qualification and certification.
• Aircraft Design Engineering: Supports system integrators and engineers in selecting suitable cables to ensure efficient signal transmission and minimal electromagnetic interference in avionic systems.
• Quality Assurance: Allows testing laboratories and quality control units to verify that supplied cables conform to specified impedance requirements, minimizing risk of system failure.
• Maintenance and Repair Operations: Ensures field engineers can assess cable integrity and compliance using standardized measurement procedures during aircraft maintenance or retrofitting.
• Regulatory Compliance: Assists organizations in meeting EASA, FAA, and other international regulatory requirements through reference to harmonized European standards.

Utilizing this standard helps aerospace stakeholders ensure reliability, safety, and optimal performance of electrical systems in aircraft.

Related Standards

For a comprehensive approach to cable testing and specification in aerospace applications, consider these related standards:

• EN 3475-100: Aerospace series - Cables, electrical, aircraft use - Test methods - Part 100: General. Establishes general test procedures and requirements.
• EN 3475-804: Aerospace series - Cables, electrical, aircraft use - Test methods - Part 804: Velocity of propagation. Details measurement of signal propagation speed, which is closely related to characteristic impedance.
• EN 50289-1-11: Communication cables - Electrical test methods - Part 1-11: Characteristic impedance, input impedance, return loss. Provides foundational measurement techniques adopted in FprEN 3475-805.

By conforming to FprEN 3475-805 and related standards, organizations strengthen the quality and compatibility of aircraft electrical systems, supporting safety and innovation in aerospace technology.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2023
Aeronavtika - Električni kabli za uporabo v zračnih plovilih - Preskusne metode -
805. del: Karakteristična impedanca
Aerospace series – Cables, electrical, aircraft use - Test methods - Part 805:
Characteristic impedance
Luft- und Raumfahrt - Elektrische Leitungen für Luftfahrtverwendung - Prüfverfahren -
Teil 805: Wellenwiderstand
Série aérospatiale - Câbles électriques à usage aéronautique - Méthodes d'essais -
Partie 805: Impéndance caractéristique
Ta slovenski standard je istoveten z: prEN 3475-805
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
prEN 3475-805
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2023
ICS 49.060 Will supersede EN 3475-805:2002
English Version
Aerospace series - Cables, electrical, aircraft use - Test
methods - Part 805: Characteristic impedance
Série aérospatiale - Câbles électriques à usage Luft- und Raumfahrt - Elektrische Leitungen für
aéronautique - Méthodes d'essais - Partie 805: Luftfahrtverwendung - Prüfverfahren - Teil 805:
Impéndance caractéristique Wellenwiderstand
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
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 3475-805:2023 E
worldwide for CEN national Members.

prEN 3475-805:2023 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Preparation of specimens . 4
5 Methods . 4
5.1 Method A: measurement with impedance bridge on coaxial cable . 4
5.2 Method B: reflectometer measurement on coaxial cable . 5
5.3 Method C: shielded symmetric cable measurement . 5
5.3.1 General. 5
5.3.2 Apparatus . 6
5.3.3 Measurement procedure . 6
5.3.4 Measurements . 7
6 Requirement . 7

prEN 3475-805:2023 (E)
European foreword
This document (prEN 3475-805:2023) has been prepared
...