BS EN 50289-4-7-2008 Communication ncables — Specifications nfor test methods — nPart 4-7 Environmental test methods — nDamp heat steady state《通信电缆 试验方法用规范 环境试验方法 稳态湿热》.pdf

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

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