1、BRITISH STANDARDBS EN 50289-4-7:2008Communication cables Specifications for test methods Part 4-7: Environmental test methods Damp heat, steady stateICS 33.120.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g
2、44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 50289-4-7:2008This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2008 BSI 2008ISBN 978 0 580 57845 8National forewordThis British Standard is the UK implementation of E
3、N 50289-4-7:2008. The UK participation in its preparation was entrusted to Technical Committee EPL/46, Cables, wires and waveguides, radio frequency connectors and accessories for communication and signalling.A list of organizations represented on this committee can be obtained on request to its sec
4、retary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments/corrigenda issued since publicationDate CommentsEUROPEAN STAND
5、ARD EN 50289-4-7 NORME EUROPENNE EUROPISCHE NORM January 2008 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2008 CENELEC - All
6、 rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50289-4-7:2008 E ICS 33.120.10 English version Communication cables - Specifications for test methods - Part 4-7: Environmental test methods - Damp heat, steady state Cbles de communication - Spc
7、ifications des mthodes dessais - Partie 4-7: Mthodes dessais denvironnement - Chaleur humide, essai continu Kommunikationskabel - Spezifikationen fr Prfverfahren - Teil 4-7: Umweltprfverfahren - Feuchte Wrme, konstant This European Standard was approved by CENELEC on 2007-09-01. CENELEC members are
8、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. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to th
9、e Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the s
10、ame status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, No
11、rway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 50289-4-7:2008 - 2 - Foreword This European Standard was prepared by the Technical Committee CENELEC TC 46X, Communication cables. The text of the draft was submitted to the Unique Acceptance P
12、rocedure and was approved by CENELEC as EN 50289-4-7 on 2007-09-01. The following dates were fixed: - latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2008-09-01 - latest date by which the national standards
13、conflicting with the EN have to be withdrawn (dow) 2010-09-01 This European Standard has been prepared under the European Mandate M/212 given to CENELEC by the European Commission and the European Free Trade Association. _ BS EN 50289-4-7:2008- 3 - EN 50289-4-7:2008 Contents 1 Scope4 2 Normative ref
14、erences.4 3 Definitions4 4 Test methods .4 4.1 Equipment .4 4.2 Test sample.4 4.3 Procedure5 4.4 Requirements 6 4.5 Details to be specified6 5 Test report6 BS EN 50289-4-7:2008EN 50289-4-7:2008 - 4 - 1 Scope This Part 4-7 of EN 50289 details the method of test to determine the stability of transmiss
15、ion performance of a finished cable used in analogue and digital communication systems when submitted to damp heat steady state which may occur during use. It is to be read in conjunction with Part 4-1 of EN 50289, which contains essential provisions for its application. 2 Normative references The f
16、ollowing 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 50289-4-1 2001 Communication cables - Specification
17、s for tests methods Part 4-1: Environmental test methods - General requirements EN 50290-1-2 2004 Communication cables Part 1-2: Definitions EN 60068-2-14 1999 Environmental testing Part 2: Tests - Test N: Change of temperature (IEC 60068-2-14:1984 + A1:1986) 3 Definitions For the purposes of this d
18、ocument, the definitions of EN 50290-1-2 apply. 4 Test methods 4.1 Equipment a) Appropriate transmission measuring apparatus for determination of changes in transmission performance. b) Climatic chamber: the climatic chamber shall be of a suitable size to accommodate the sample and its temperature s
19、hall be controllable to remain within 3 K of the specified testing temperature. It must incorporate means of admitting water vapour to, or generating water vapour within. One example of a suitable chamber is given in Clause 2, test Nb, of EN 60068-2-14. 4.2 Test sample The sample shall be of suffici
20、ent length as indicated in the relevant cable specification to achieve the desired accuracy. In order to gain reproducible values, it may be necessary for the cable sample to be brought into the climatic chamber as a loose coil or on a reel. BS EN 50289-4-7:2008- 5 - EN 50289-4-7:2008 General recomm
21、endations are: the winding diameter shall be large enough to maintain the ability of the cable to accommodate differential expansion and contraction. A winding diameter substantially greater than the value selected for cable delivery may be necessary; any risk of cable expansion (or contraction) lim
22、itation created by conditioning shall be suppressed. In particular special care should be taken to avoid residual tension on the cable during the test. For example a tight multilayer winding can limit expansion at high temperature; the use of loose winding is recommended such as large diameter coils
23、, cushioned reels with a soft layer of zero tension facility device, etc.; for optical cables, in order to limit the length of the cable under test, it is permissible to connect several fibres of the cable and to measure the connected fibres. The number of connections shall be limited and they shoul
24、d be located outside the climatic chamber. A sufficient number of fibres distributed over the cable structure should be tested, as defined in the relevant cable specification. 4.3 Procedure 4.3.1 Initial measurement The sample shall be visually inspected and a basic value for the transmission parame
25、ters at the initial temperature shall be determined. Pre-conditioning conditions shall be agreed between customer and supplier. 4.3.2 Testing 4.3.2.1 The sample at ambient temperature shall be introduced into the climatic chamber that is at the same temperature. 4.3.2.2 The temperature in the chambe
26、r shall then be raised to the appropriate high temperature TB(normally 60 C) at the appropriate rate of heating. 4.3.2.3 After temperature stability in the chamber has been reached steam shall be admitted to or generated in the chamber. The humidity shall be maintained at 95 %, the sample shall be e
27、xposed to the high temperature conditions for the appropriate period t1 (normally 96 h). 4.3.2.4 The temperature in the chamber shall then be lowered to the ambient temperature at the appropriate rate of cooling. 4.3.2.5 Before removal from the chamber, the sample under test shall have reached tempe
28、rature stability at ambient temperature. 4.3.3 Recovery If the ambient temperature is not the standard atmospheric condition to be used for testing after removal from the chamber, the sample shall be allowed to attain temperature stability at this latter condition. The relevant cable specification m
29、ay call for a specific recovery period for a given type of sample. BS EN 50289-4-7:2008EN 50289-4-7:2008 - 6 - 4.4 Requirements The acceptance criteria for the test shall be as stated in the relevant cable specification. 4.5 Details to be specified the permissible change of transmission parameter an
30、d inspection checks during cycling; transmission parameters to be measured (they may include attenuation, electrical length); values of TBand t1and the rate of cooling or heating; recovery period. 5 Test report The test report shall include the period(s) at which inspection checks are carried out, c
31、able sample length, type of winding: coil, reel, other (to be stated; in case of a cushioned reel, the type of cushioning and material used); winding diameter; single or multilayer winding; winding tension and zero tension facility device (if any), type of measurement equipment, temperature cycle di
32、agram, change of transmission parameters as a function of temperature cycling, pass/fail criteria. BS EN 50289-4-7:2008blankBS EN 50289-4-7:2008BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It p
33、resents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter.RevisionsBritish Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions.It is the constant aim of BS
34、I to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: +44 (0)20 8
35、996 9000. Fax: +44 (0)20 8996 7400.BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards.Buying standardsOrders for all BSI, international and foreign standards publications should be addressed to Customer
36、Services. Tel: +44 (0)20 8996 9001. Fax: +44 (0)20 8996 7001. Email: ordersbsi-. Standards are also available from the BSI website at http:/www.bsi-.In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Stand
37、ards, unless otherwise requested.Information on standardsBSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on al
38、l its products and services. Contact the Information Centre. Tel: +44 (0)20 8996 7111. Fax: +44 (0)20 8996 7048. Email: infobsi-.Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and o
39、ther benefits contact Membership Administration. Tel: +44 (0)20 8996 7002. Fax: +44 (0)20 8996 7001. Email: membershipbsi-.Information regarding online access to British Standards via British Standards Online can be found at http:/www.bsi- information about BSI is available on the BSI website at htt
40、p:/www.bsi-.CopyrightCopyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the international standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system
41、or transmitted in any form or by any means electronic, photocopying, recording or otherwise without prior written permission from BSI.This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained.Details and advice can be obtained from the Copyright & Licensing Manager. Tel: +44 (0)20 8996 7070. Fax: +44 (0)20 8996 7553. Email: copyrightbsi-.
