1、BRITISH STANDARDBS EN 50289-4-5:2008Communication cables Specifications for test methods Part 4-5: Environmental test methods Climatic sequenceICS 33.120.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g
2、55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 50289-4-5:2008This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2008 BSI 2008ISBN 978 0 580 57844 1National forewordThis British Standard is the UK implementation of EN 5028
3、9-4-5:2008. 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 secretary
4、.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 STANDARD EN
5、 50289-4-5 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 right
6、s of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50289-4-5:2008 E ICS 33.120.10 English version Communication cables - Specifications for test methods - Part 4-5: Environmental test methods - Climatic sequence Cbles de communication - Spcifications d
7、es mthodes dessais - Partie 4-5: Mthodes dessais denvironnement - Squence climatique Kommunikationskabel - Spezifikationen fr Prfverfahren - Teil 4-5: Umweltprfverfahren - Klimawechsel This European Standard was approved by CENELEC on 2007-09-01. CENELEC members are bound to comply with the CEN/CENE
8、LEC 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 Central Secretariat or to any C
9、ENELEC 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 status as the official versio
10、ns. 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, Norway, Poland, Portugal, Romania,
11、Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 50289-4-5:2008 - 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 Procedure and was approved by CENE
12、LEC as EN 50289-4-5 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 conflicting with the EN have to b
13、e 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 50289-4-5:2008- 3 - EN 50289-4-5:2008 Contents 1 Scope 4 2 Normative references . 4 3 Definitions. 4 4 T
14、est methods 4 4.1 Equipment . 4 4.2 Test sample . 4 4.3 Procedure 5 4.4 Requirements. 6 4.5 Details to be specified 6 5 Test report 6 Figure 1 One cycle procedure 7 BS EN 50289-4-5:2008EN 50289-4-5:2008 - 4 - 1 Scope This Part 4-5 of EN 50289 details the method of test to determine the stability of
15、transmission performance of a finished cable used in analogue and digital communication systems when submitted to temperature changes which may occur during use, storage or transportation. It is to be read in conjunction with Part 4-1 of EN 50289, which contains essential provisions for its applicat
16、ion. 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, the latest edition of the referenced document (including any amendments) applies. EN 50289-4-1 2001 Com
17、munication cables - Specifications for test 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 + A:1986) 3 Defin
18、itions For the purposes of this document, 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
19、 the sample and its temperature shall 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 samp
20、le The sample shall be of sufficient 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 50289-4-5:2008- 5 -
21、 EN 50289-4-5:2008 General recommendations are: - the winding diameter shall be large enough to maintain the ability of the cable to accommodate differential expansion and contraction. The winding diameter should not be greater than the winding diameter used for the delivery; - any risk of cable exp
22、ansion (or contraction) limitation 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 oth
23、er hand, a tight multilayer winding 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
24、 is permissible to connect several 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 relev
25、ant cable specification. 4.3 Procedure 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 4.3.2.1 T
26、he 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 chamber shall then be lowered to the appropriate low temperature TAat the appropriate rate of cooling. 4.3.2.3 After temperature stability in the chamber has
27、 been reached, the sample shall be exposed to the low temperature conditions for the appropriate period t1. 4.3.2.4 The temperature in the chamber shall then be raised to the appropriate high temperature TBat the appropriate rate of heating. 4.3.2.5 After temperature stability in the chamber has bee
28、n reached steam shall be admitted to or generated in the chamber. The humidity shall be maintained at 95 %, the sample shall be exposed to the high temperature conditions for the appropriate period t1. 4.3.2.6 The temperature in the chamber shall then be lowered to the ambient temperature at the app
29、ropriate rate of cooling. 4.3.2.7 This procedure constitutes one cycle (see Figure 1). 4.3.2.8 The sample shall be subjected to ten cycles unless otherwise required in the relevant cable specification. BS EN 50289-4-5:2008EN 50289-4-5:2008 - 6 - 4.3.2.9 Before removal from the chamber, the sample un
30、der test shall have reached temperature stability at ambient temperature. 4.3.2.10 If the relevant cable specification indicates different temperature ranges for storage and use, instead of two separate tests, a combined test procedure is allowed. 4.3.3 Recovery If the ambient temperature is not the
31、 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 may call for a specific recovery period for a given type of sample. 4.4 Requirements The accep
32、tance 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 and inspection cheeks during cycling; - transmission parameters to be measured (they may include attenuation, electrical length); - value
33、s of TA, TBand t1and the rate of cooling or heating; - number of cycles if different of ten; - recovery period. 5 Test report 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 o
34、f 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 diagram, - change of transmission parameters as a function of temperature cyc
35、ling, - pass/fail criteria. BS EN 50289-4-5:2008- 7 - EN 50289-4-5:2008 Temperaturein thechamberTBTAt1t1ATime t1 cycleA = start of first cycleFigure 1 One cycle procedure BS EN 50289-4-5:2008BS EN 50289-4-5:2008BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independ
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