SIST EN 3475-804:2004
(Main)Aerospace series - Cables, electrical, aircraft use - Test methods - Part 804: Velocity of propagation
Aerospace series - Cables, electrical, aircraft use - Test methods - Part 804: Velocity of propagation
This standard specifies a method for measuring the velocity of propagation in a cable.
It shall be used together with EN 3475-100.
Luft- und Raumfahrt - Elektrische Leitungen für Luftfahrtverwendung - Prüfverfahren - Teil 804: Ausbreitungsgeschwindigkeit
Diese Norm legt ein Verfahren zum Messen der Ausbreitungsgeschwindigkeit in einer Leitung fest.
Sie ist in Verbindung mit EN 3475-100 anzuwenden.
Série aérospatiale - Câbles électriques a usage aéronautique - Méthodes d'essais - Partie 804: Vitesse de propagation
Aerospace series - Cables, electrical, aircraft use - Test methods - Part 804: Velocity of propagation
General Information
- Status
- Published
- Publication Date
- 30-Apr-2004
- Technical Committee
- I08 - Imaginarni 08
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-May-2004
- Due Date
- 01-May-2004
- Completion Date
- 01-May-2004
Relations
- Effective Date
- 26-Mar-2025
Overview
EN 3475-804:2002 is a CEN/AECMA test-method standard that specifies how to measure the velocity of propagation (VoP) in aircraft electrical cables. It is intended to be used together with EN 3475-100 (general test-method provisions) and provides a repeatable procedure for laboratories and manufacturers to determine the signal propagation speed in cable samples for aerospace applications.
Key topics and requirements
- Test method: Use a real-time reflectometer delivering a reference signal with a rise time ≤ 150 ps, fitted to a precision coaxial air line and an oscilloscope.
- Test geometry: Measure on a sample length of (3 ± 0.01) m.
- Connection and preparation:
- Strip and prepare specimens to minimize input mismatch (use appropriate connectors or shortest possible leads).
- One end of the cable sample must be open-circuited.
- For coaxial cables: centre and outer conductors must be connected to their counterparts in the coaxial air line.
- For symmetrical (paired) cables: measure in differential mode, connecting each conductor of the pair to one conductor of the coaxial air line; do not connect any screens.
- Reference impedance: Use a precision coaxial air line with characteristic impedance Zo, accuracy ±1%.
- Calculation: Velocity of propagation is derived from the measured round-trip propagation time t (go-and-return) using the formula:
- V = 10.6 / t
- where V is in kilometres per second (km/s) and t is in nanoseconds (ns).
- Acceptance: The measured VoP must fall within limits specified in the applicable product standard for the cable under test.
Applications and users
- Aerospace cable manufacturers and suppliers verifying electrical properties during production and qualification.
- Independent test laboratories performing acceptance and conformity testing for avionics and aircraft wiring.
- Design and R&D engineers characterizing cable dielectric and geometry effects on signal timing.
- Quality assurance, procurement, and certification bodies ensuring cables meet product-standard VoP limits.
- Maintenance and troubleshooting teams assessing cable integrity or signal timing in avionics harnesses.
Related standards
- EN 3475-100 - Aerospace series: Cables, electrical, aircraft use - Test methods - Part 100: General (mandatory companion document referenced by EN 3475-804)
Keywords: EN 3475-804, velocity of propagation, aerospace cables, cable test method, real-time reflectometer, VoP measurement, EN 3475-100, aircraft wiring testing.
Frequently Asked Questions
SIST EN 3475-804:2004 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Aerospace series - Cables, electrical, aircraft use - Test methods - Part 804: Velocity of propagation". This standard covers: This standard specifies a method for measuring the velocity of propagation in a cable. It shall be used together with EN 3475-100.
This standard specifies a method for measuring the velocity of propagation in a cable. It shall be used together with EN 3475-100.
SIST EN 3475-804:2004 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.
SIST EN 3475-804:2004 has the following relationships with other standards: It is inter standard links to oSIST prEN 3475-804:2025. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase SIST EN 3475-804:2004 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of SIST standards.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Cables, electrical, aircraft use - Test methods - Part 804: Velocity of propagationLuft- und Raumfahrt - Elektrische Leitungen für Luftfahrtverwendung - Prüfverfahren - Teil 804: AusbreitungsgeschwindigkeitSérie aérospatiale - Câbles électriques a usage aéronautique - Méthodes d'essais - Partie 804: Vitesse de propagationAerospace series - Cables, electrical, aircraft use - Test methods - Part 804: Velocity of propagation49.060Aerospace electric equipment and systemsICS:Ta slovenski standard je istoveten z:EN 3475-804:2002SIST EN 3475-804:2004en01-maj-2004SIST EN 3475-804:2004SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 3475-804June 2002ICS 49.060English versionAerospace series - Cables, electrical, aircraft use - Testmethods - Part 804: Velocity of propagationSérie aérospatiale - Câbles électriques à usageaéronautique - Méthodes d'essais - Partie 804: Vitesse depropagationLuft- und Raumfahrt - Elektrischen Leitungen für LuftfahrtVerwendung - Prüfverfahren - Teil 804:AusbreitungsgeschwindigkeitThis European Standard was approved by CEN on 20 January 2002.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 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 Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2002 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3475-804:2002 ESIST EN 3475-804:2004
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