1、BRITISH STANDARD BS EN 50289-4-6:2001 Communication cables Specifications for test methods Part 4-6: Environmental test methods Temperature cycling The European Standard EN 50289-4-6:2001 has the status of a British Standard ICS 33.120.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPY
2、RIGHT LAWBS EN 50289-4-6:2001 This British Standard, having been prepared under the direction of the Electrotechnical Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 14 November 2001 BSI 14 November 2001 ISBN 0 580 38692 9 Nat
3、ional foreword This British Standard is the official English language version of EN 50289-4-6:2001. The UK participation in its preparation was entrusted by Technical Committee EPL/46, Cables, wire and waveguides, RF connectors, and accessories for communication and signalling, to Subcommittee EPL/4
4、6/1, Communication cables, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in
5、 the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are
6、 responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK
7、interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 7 and a back cover. The BSI copyright date displayed in this document indicates when
8、 the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 50289-4-6 NORME EUROPENNE EUROPISCHE NORM October 2001 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr
9、Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2001 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50289-4-6:2001 E ICS 33.120.10 English version Communication cables Specifications for test
10、methods Part 4-6: Environmental test methods Temperature cycling Cbles de communication Spcifications des mthodes dessai Partie 4-6: Mthodes dessais denvironnement Cycles thermiques Kommunikationskabel Spezifikationen fr Prfverfahren Teil 4-6: Umweltprfverfahren - Temperaturwechselprfung This Europe
11、an Standard was approved by CENELEC on 2001-05-01. CENELEC members are 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
12、concerning such national standards may be obtained on application to the 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
13、into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, N
14、orway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EN 50289-4-6:2001 - 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 formal vote and was approved by CENELEC as EN 50289-4-6 on 2
15、001-05-01. 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) 2002-04-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2004-04-01
16、 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.- 3 - EN 50289-4-6:2001 Contents 1 Scope 4 2 Normative references. 4 3 Definitions. 4 4 Test methods. 4 4.1 Equipment 4 4.2 Test sample . 4 4
17、.3 Procedure 5 4.3.1 Initial measurement 5 4.3.2 Cycling 5 4.3.3 Recovery. 6 4.4 Requirements. 6 4.5 Details to be specified. 6 5 Test report. 7EN 50289-4-6:2001 - 4 - 1 Scope This Part 4-6 of EN 50289 details the method of test to determine the temperature cycling used in analogue and digital commu
18、nication systems. It is to be read in conjunction with Part 4-1 of EN 50289, which contains essential provisions for its application. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at
19、the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references, the latest edition of
20、the publication referred to applies (including amendments). EN 50289-4-1 2001 Communication cables - Specifications for test methods Part 4-1: Environmental test methods - General requirements EN 50290-1-2 1) Communication cables Part 1-2: Definitions EN 60068-2-14 Environmental testing Part 2: Test
21、s Test N: Change of temperature (IEC 60068-2-14) 3 Definitions For the purposes of this European Standard, 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
22、 The climatic chamber shall be of a suitable size to accommodate the sample and its temperature shall be controllable to remain within 3 K of the specified testing temperature. 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 s
23、ufficient length as indicated in the detail 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.1)At draft stage.- 5 - EN 50289-4-6:2001 General recommendati
24、ons 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) limit
25、ation 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 winding on a drum is not recommended as it can limit cable contraction at low temperature. On the other hand, a tight multilayer w
26、inding can limit expansion at high temperature. - The use of loose winding is recommended such as large diameter coils, 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 sev
27、eral fibres of the cable and to measure the connected fibres. The number of connections shall be limited and they should be located outside the climatic chamber. A sufficient number of fibres distributed over the cable structure should be tested, as defined in the Detail Specification. 4.3 Procedure
28、 4.3.1 Initial measurement The sample shall be visually inspected and a basic value for the transmission parameters at the initial temperature shall be determined. Pre-conditioning conditions shall be agreed between customer and supplier. 4.3.2 Cycling a) The sample at ambient temperature shall be i
29、ntroduced into the climatic chamber that is at the same temperature. b) The temperature in the chamber shall then be lowered to the appropriate low temperature T Aat the appropriate rate of cooling. c) After temperature stability in the chamber has been reached, the sample shall be exposed to the lo
30、w temperature conditions for the appropriate period t 1 . d) The temperature in the chamber shall then be raised to the appropriate high temperature T Bat the appropriate rate of heating. e) After temperature stability in the chamber has been reached, the sample shall be exposed to the high temperat
31、ure conditions for the appropriate period t 1 . f) The temperature in the chamber shall then be lowered to the ambient temperature at the appropriate rate of cooling. g) This procedure constitutes one cycle (see Figure 1). h) The sample shall be subjected to two cycles unless otherwise required in t
32、he relevant detail specification. i) Before removal from the chamber, the sample under test shall have reached temperature stability at ambient temperature. j) If the relevant detail specification indicates different temperature ranges for storage and used, instead of two separate tests, a combined
33、test procedure is allowed in accordance with figure 2.EN 50289-4-6:2001 - 6 - 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 conditio
34、n. The relevant Detail Specification may call for a specific recovery period for a given type of sample. 4.4 Requirements The acceptance criteria for the test shall be as stated in the Detail Specification. 4.5 Details to be specified - the permissible change of transmission parameter and inspection
35、 checks during cycling; - transmission parameters to be measured; - values of TA, TB and t1 and the rate of cooling or heating; - number of cycles; - humidity levels at each temperature extreme (if any); - recovery period. Temperature in the chamber T B T A t 1 t 1 A Time t 1 cycle A = start of firs
36、t cycle Figure 1 - One cycle procedure- 7 - EN 50289-4-6:2001 Temperature in the chamber T B2 T A1 t 1 A Time t 1 cycle t 1 t 1 t 1 T A2 T B1 Figure 2 - Combined test procedure 5 Test report The test report shall include: - the period(s) at which inspection checks are carried out; - cable sample len
37、gth; - 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 dia
38、gram; - change of transmission parameters as a function of temperature cycling; - pass/fail criteria.BS EN 50289-4-6:2001 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK vi
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