1、Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 07/07/2008 04:25, Uncontrolled Copy, (c) BSIg49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58T
2、est methods Part 705: Contrast measurementICS 49.060Aerospace series Fibres and cables, optical, aircraft use BRITISH STANDARDBS EN 3745-705:2007BS EN 3745-705:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 07/07/2008 04:25, Uncontrolled Copy, (c) BSIThis British Standard was published u
3、nder the authority of the Standards Policy and Strategy Committee on 31 March 2008 BSI 2008ISBN 978 0 580 53160 6Amendments/corrigenda issued since publicationDate Commentscontract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal
4、 obligations.National forewordThis British Standard is the UK implementation of EN 3745-705:2007.The UK participation in its preparation was entrusted by Technical Committee ACE/6, Aerospace avionic electrical and fibre optic technology, to Panel ACE/6/-/10, Aerospace-fibre optic systems and equipme
5、nt.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 3745-705December 2007ICS 49.060English VersionAerospace series - Fibre
6、s and cables, optical, aircraft use - Testmethods - Part 705: Contrast measurementSrie arospatiale - Fibres et cbles optiques usagearonautique - Mthodes dessais - Partie 705 : Mesure decontrasteLuft- und Raumfahrt - Faseroptische Leitungen frLuftfahrzeuge - Prfverfahren - Teil 705: KontrastmessungTh
7、is European Standard was approved by CEN on 25 July 2007.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
8、 concerning such nationalstandards may be obtained on application to the CEN 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
9、 own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithua
10、nia, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN A
11、ll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3745-705:2007: ELicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 07/07/2008 04:25, Uncontrolled Copy, (c) BSIEN 3745-705:2007 (E) 2 Contents Page Foreword3 1 Scope 4 2 Normative refere
12、nces 4 3 Terms and definitions .4 4 Preparation of samples .4 5 Test equipment 5 6 Process .6 BS EN 3745-705:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 07/07/2008 04:25, Uncontrolled Copy, (c) BSIEN 3745-705:2007 (E) 3 Foreword This document (EN 3745-705:2007) has been prepared by th
13、e 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 ASD
14、, 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 June 2008, and conflicting national standards shall be withdrawn at the latest by June 2008. Attention is drawn
15、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 the following
16、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, Slovakia, Slovenia,
17、 Spain, Sweden, Switzerland and the United Kingdom. BS EN 3745-705:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 07/07/2008 04:25, Uncontrolled Copy, (c) BSIEN 3745-705:2007 (E) 4 1 Scope This standard specifies the process to be applied for measuring different colour densities of cable
18、 identification markings. It is designed to define a reproducible process of contrast value determination. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, t
19、he latest edition of the referenced document (including any amendments) applies. ISO 7724-1, Paints and varnishes Colorimetry Part 1: Principles CIE 15, Colorimetry 1)3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 contrast ratio of reflectin
20、g light (here: reflecting light of cable identification marking and cable surface) 3.2 illuminance reflection of visible light 3.3 measuring range maximum effective range of measurement 4 Preparation of samples The cable samples shall be identified in compliance with applicable manufacturing instruc
21、tion using the power density specified in the technical specification. The surfaces of the cable samples shall be clean and without damage. The identification markings to be measured shall even be in colour and shall have sharply defined marking edges i.e. marks are correctly focussed. Before starti
22、ng measurements clean the surfaces with a soft, lint-free cloth to avoid distortion of test results by a roughened surface or “deposits“. 1) Published by CIE Central Bureau - Kegelgasse 27 - A-1030 Wien - Austria. BS EN 3745-705:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 07/07/2008 0
23、4:25, Uncontrolled Copy, (c) BSIEN 3745-705:2007 (E) 5 5 Test equipment 5.1 Components of the measuring device The measuring device comprises a photometer, lighting equipment and a cable handling device. The whole set-up shall be designed to ensure that test results are not falsified by external inf
24、luences. The photometer installation shall be stable and free from vibrations, and influences by external light and reflections from scattered light shall be excluded. 5.2 Equipment colour The device for handling cable samples and accessories shall be designed in matt black colour to absorb scattere
25、d light. 5.3 Illuminance Illuminance shall be determined with a calibrated electrical photometer. The manufacturer instructions concerning the measuring probe work range and operating instructions shall be observed. Measuring sensitivity of the photometer shall be in conformity with CIE-publication
26、15. 5.4 Diameter of measuring spot The admissible diameter of the measuring spot shall not exceed 75 % of the marking size (X and Y dimension). Measuring tolerance of the photometer shall be diameter of measuring spot). The contrast is calculated as follows: K = %100max.min.max.LLL )(where K is the
27、contrast; L is the light intensity. 6.5 Requirement The contrast value as determined between cable identification marking and cable surface shall conform to the specifications of the corresponding product standard. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 07/07/2008 04:25, Uncontrolled
28、 Copy, (c) BSIBS EN BSILicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 07/07/2008 04:25, Uncontrolled Copy, (c) BSI389 Chiswick High RoadLondonW4 4AL3745-705:2007BSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the
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