1、BRITISH STANDARD E%x% Communication cables - Specifications for test methods - Part 4-6: Environmental test methods - Temperature cycling The European Standard EN 50289-4-62001 has the status of a British Standard ICs 33.120.10 BS EN 502894-6:2001 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTE
2、D BY COPYRIGHT LAW BS EN 50289-4-6:2001 Amd. No. O BSI 14 November 2001 National foreword Date Comments This British Standard is the official English language version of The UK participation in its preparation was entrusted by Technical Committee EPL/46, Cables, wire and waveguides, RF connectors, a
3、nd accessories for communication and signalling, to Subcommittee EPL/46/1, Communication cables, which has the responsibility to: EN 50289-4-6:2001. - - aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, a
4、nd keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. - 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 Eu
5、ropean publications referred to in this document may be found in 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 ne
6、cessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. This British Standard, having Summary of pages This document comprises a front cover, an inside fr
7、ont cover, the EN title page, been prepared under the direction of the Eleitrokchnical sector policv and Strategy Committee, was published under the authority ofthe standards policy and pages 2 to 7 and a back cover. The BSI copyright date displayed in this document indicates when the Strategy Commi
8、ttee on 14 November 2001 document was last issued. ISBN O 580 38692 9 E U ROPEAN STAN DARD NORME EUROPENNE EUROPISCHE NORM October 2001 ICs 33.120.10 English version Communication cables - Specifications for test methods Part 4-6: Environmental test methods - Tem peratu re cycling Cbles de communica
9、tion - Spcifications des mthodes dessai Partie 4-6: Mthodes dessais denvironnement - Cycles thermiques Kommunikationskabel- Spezifikationen fr Prfverfahren Teil 4-6: Umweltprfverfahren - Temperaturwechsel Prfung This European Standard was approved by CENELEC on 2001-05-01. CENELEC members are bound
10、to comply with the CENICENELEC 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 the Cent
11、ral 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 same st
12、atus 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, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC Europ
13、ean Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central secretariat: rue de Stassart 35, B - 1050 Brussels O 2001 CENELEC - All rights of exploitation in any form and by any means reserved worldwide f
14、or CENELEC members. Ref. No. EN 502894-6:2001 E 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 2001-05-01. The fo
15、llowing 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 - latest date by which the national standards conflicting with the EN have to be withdrawn (dop) 2002-04-01 (dOW) 2004-04-01 This Europea
16、n 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 . 4.3 Procedure
17、5 4.3.1 Initial measurement 5 4.3.3 Recovery . 6 4.4 Requirements . . 4.5 Details to be specified . 6 5 Test report . 7 4.3.2 Cycling 5 EN 50289-4-6:2001 -4- i Scope This Part 4-6 of EN 50289 details the method of test to determine the temperature cycling used in analogue and digital communication s
18、ystems. 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 the approp
19、riate 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 the public
20、ation 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 ) EN 60068-2-14 Communication cables - Part 1-2: Definitions Environmental testing - Part 2: Tests -
21、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 T
22、he climatic chamber shall be of a suitable size to accommodate the sample and its temperature shall be controllable to remain within I3 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 su
23、fficient 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. ) At draft stage. -5- EN 50289-4-6:200 1 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) limitat
25、ion 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 win
26、ding 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 several f
27、ibres 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 The sample at ambient temperature shall be intr
29、oduced into the climatic chamber that is at the same tem pera t Ure. The temperature in the chamber shall then be lowered to the appropriate low temperature TA at the appropriate rate of cooling. After temperature stability in the chamber has been reached, the sample shall be exposed to the low temp
30、erature conditions for the appropriate period ti. The temperature in the chamber shall then be raised to the appropriate high temperature TB at the appropriate rate of heating. After temperature stability in the chamber has been reached, the sample shall be exposed to the high temperature conditions
31、 for the appropriate period tr. The temperature in the chamber shall then be lowered to the ambient temperature at the appropriate rate of cooling. This procedure constitutes one cycle (see Figure 1). The sample shall be subjected to two cycles unless otherwise required in the relevant detail specif
32、ication. Before removal from the chamber, the sample under test shall have reached temperature stability at ambient temperature. If the relevant detail specification indicates different temperature ranges for storage and used, instead of two separate tests, a combined test procedure is allowed in ac
33、cordance with figure 2. EN 50289-4-61200 1 -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 condition. The relevant Detail Specific
34、ation 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 checks during cycling; - trans
35、mission parameters to be measured; - values of TA, TB and tl and the rate of cooling or heating; - number of cycles; - humidity levels at each temperature extreme (if any); - recovery period. 4 TL3 Temperature in the chamber TA 1 cycle A = start of first cycle Figure 1 - One cycle procedure -7- EN 5
36、0289-4-6:2001 Ti TB1 Temperature in lhe damber 1 1 cyde -+ Timet Figure 2 - Combined test procedure 5 Testreport The test report shall include: the period(s) at which inspection checks are carried out; cable sample length; type of winding: coil, reel, other (to be stated, in case of a cushioned reel
37、, the type of cushioning and material used): wind i ng diameter; single or multilayer winding; winding tension and zero tension facility device (if any): type of measurement equipment; temperature cycle diagram; change of transmission parameters as a function of temperature cycling; pass/fail criter
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