1、BS EN3475-809:2009ICS 49.060NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDAerospace series Cables, electrical,aircraft use TestmethodsPart 809: Resistance unbalanceThis British Standardwas published under theauthority of the StandardsPolicy and StrategyCommitt
2、ee on 30 April2009 BSI 2009ISBN 978 0 580 62411 7Amendments/corrigenda issued since publicationDate CommentsBS EN 3475-809:2009National forewordThis British Standard is the UK implementation of EN 3475-809:2009.The UK participation in its preparation was entrusted to TechnicalCommittee ACE/6, Aerosp
3、ace avionic electrical and fibre optictechnology.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with
4、a British Standard cannot confer immunityfrom legal obligations.BS EN 3475-809:2009EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 3475-809March 2009ICS 49.060English VersionAerospace series - Cables, electrical, aircraft use - Testmethods - Part 809: Resistance unbalanceSrie arospatiale - Cbles l
5、ectriques usagearonautique - Mthodes dessais - Partie 809:Dsquilibre de rsistanceLuft- und Raumfahrt - Elektrische Leitungen frLuftfahrtverwendung - Prfverfahren - Teil 809:WiderstandsunsymmetrieThis European Standard was approved by CEN on 11 July 2008.CEN members are bound to comply with the CEN/C
6、ENELEC 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 CEN Management Centre or to an
7、y 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 CEN Management Centre has the same status as theofficial versions.CEN
8、 members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Swede
9、n, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No
10、. EN 3475-809:2009: EBS EN 3475-809:2009EN 3475-809:2009 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Preparation of specimens .4 4 Apparatus .4 5 Method 4 6 Requirement .4 BS EN 3475-809:2009EN 3475-809:2009 (E) 3 Foreword This document (EN 3475-809:2009) has been prepared by
11、 the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out in accordance with the rules of this Association, this Standard has received the approval of the National Associations and the Official Services of the member countries of
12、ASD, prior to its presentation to CEN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2009, and conflicting national standards shall be withdrawn at the latest by September 2009. Attent
13、ion is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of t
14、he following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovak
15、ia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 3475-809:2009EN 3475-809:2009 (E) 4 1 Scope This standard specifies methods for measuring resistance unbalance for digital data transmission cable. It shall be used together with EN 3475-100. 2 Normative references The following
16、referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 3475-100, Aerospace series Cables, electrical, aircraft use
17、Test methods Part 100: General. EN 3475-301, Aerospace series Cables, electrical, aircraft use Test methods Part 301: Ohmic resistance per unit length. 3 Preparation of specimens The measurements may be performed on production drums and/or on the final delivery package. 4 Apparatus Wheatstone bridge
18、s, automatic or semi-automatic equipment may also be used with an accuracy of 0,5 %. 5 Method The conductor resistance unbalance is usually determined at the same time that conductor resistance measurements are made (EN 3475-301). The resistance measure of each conductor of any pair shall be perform
19、ed at or corrected to 20 C temperature. The temperature correction shall be performed as described in test method EN 3475-301. After measurement, the resistance unbalance calculation is: 100baba1=+RRRRDR 100dcdc2=+RRRRDR where ba,RR are the resistance of each conductor of the pair 1; and dc,RR are t
20、he resistance of each conductor of the pair 2 (in case of quad cable). Used expression for DR1and DR2are percent resistance unbalance. 6 Requirement The resistance unbalance obtained shall not exceed the values specified in the product standard. BS EN 3475-809:2009This page has been intentionally le
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