kSIST FprEN 3475-805:2026

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: Impéndance 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
• Public Enquiry End Date: 06-Jun-2023
• ICS: 29.060.20 - Cables
• ICS: 49.060 - Aerospace electric equipment and systems
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 5020 - Formal vote (FV) (Adopted Project)
• Start Date: 07-May-2026
• Due Date: 25-Jun-2026
• Completion Date: 08-May-2026
• Ref Project: FprEN 3475-805 - Aerospace series - Cables, electrical, aircraft use - Test methods - Part 805: Characteristic impedance

Relations

• Referred By: SIST EN ISO/ASTM 52908:2024 - 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: SIST EN ISO/ASTM 52935:2024 - Additive manufacturing of metals - Qualification principles - Qualification of coordination personnel (ISO/ASTM 52935:2023)
• Effective Date: 28-Jan-2026
• Revised: SIST EN 3475-805:2004 - Aerospace series - Cables, electrical, aircraft use - Test methods - Part 805: Characteristic impedance
• Effective Date: 19-Jan-2023

Overview

kSIST FprEN 3475-805:2026 sets out standardized test methods for measuring the characteristic impedance of electrical cables intended for aircraft use in the aerospace sector. Issued by SIST under the aerospace series, this standard ensures uniform testing approaches for both coaxial and shielded symmetric cables, thereby supporting the integrity and reliability of electrical systems within aircraft. The document is aligned with European standard EN 50289-1-11 and applies broadly across the aerospace industry where precise cable impedance measurements are crucial for system compatibility and performance.

Key Topics

• Scope of Application

  • Test methods are outlined for both coaxial and shielded symmetric (twisted pair) cables used in aircraft electrical systems.
  • Methods are intended to verify that cable impedance meets the required specifications for aerospace applications.

• Measurement Methods
  The standard includes three primary test approaches:

  • Impedance Bridge Method for coaxial cables: Uses impedance measuring equipment to determine input impedance under open and short circuit conditions.
  • Reflectometer (TDR) Measurement for coaxial cables: Employs a reflectometer to analyze the reflection coefficient and calculate impedance.
  • Vector Network Analyzer for Shielded Symmetric Cables: Utilizes a network analyzer and a balun to derive accurate impedance values from reflection data.

• Sample Preparation

  • Cables must be appropriately stripped and prepared to ensure accurate connection with the measuring apparatus.

• Conformance Requirements

  • Results must not exceed characteristic impedance limits defined in the relevant product standard.

Applications

Standardized measurement of characteristic impedance is essential for:

• Aircraft Design and Manufacturing
  • Ensures compatibility and performance of electrical and avionics systems by validating cable impedance.
• Quality Assurance and Compliance
  • Enables manufacturers and suppliers to demonstrate conformity with international aerospace standards.
• Testing and Certification
  • Facilitates comprehensive electrical cable testing procedures during certification of aircraft components.
• System Integration
  • Promotes seamless integration of electric cables within complex aerospace systems by avoiding impedance mismatches and related signal integrity issues.
• Maintenance and Troubleshooting
  • Serves as a reference method for maintenance engineers when diagnosing issues in aircraft electrical networks.

Related Standards

• EN 3475-100
  Aerospace series - Cables, electrical, aircraft use - Test methods - Part 100: General.
  Provides general principles for cable testing in aerospace applications and should be consulted alongside Part 805.
• EN 3475-804
  Aerospace series - Cables, electrical, aircraft use - Test methods - Part 804: Velocity of propagation.
  Details methods for measuring cable signal velocity, which is often related to impedance characteristics.
• EN 50289-1-11
  Communication cables - Specifications for test methods - Part 1-11: Electrical test methods - Characteristic impedance, input impedance, return loss.
  Serves as a referenced foundation for the test procedures described in kSIST FprEN 3475-805:2026.

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By adhering to kSIST FprEN 3475-805:2026, the aerospace industry can maintain high standards for electrical cable performance and safety. The standardized test methods enable accurate, repeatable, and globally recognized impedance assessments, which are critical for modern aircraft reliability and regulatory compliance.

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN 3475-805:2023
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
oSIST prEN 3475-805:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 3475-805:2023
oSIST prEN 3475-805:2023
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.

oSIST prEN 3475-805:2023
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

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