1、BRITISH STANDARD BS EN 50289-1-2:2001 Communication cables Specifications for test methods Part 1-2: Electrical test methods DC resistance The European Standard EN 50289-1-2:2001 has the status of a British Standard ICS 33.120.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW
2、BS EN 50289-1-2:2001 This British Standard, having been prepared under the direction of the Electrotechnical Sector Committee title, was published under the authority of the Standards Committee and comes into effect on 15 August 2001 BSI 07-2001 ISBN 0 580 38036 X National foreword This British Stan
3、dard is the official English language version of EN 50289-1-2:2001. 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/46/1, Communication cables, which
4、 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 the BSI Standards Catalogue und
5、er 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 responsible for their correct a
6、pplication. 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 interests informed; monitor rela
7、ted 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 6, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the docum
8、ent was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 50289-1-2 NORME EUROPENNE EUROPISCHE NORM May 2001 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnis
9、che 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 50289-1-2:2001 E ICS 33.120.20 English version Communication cables - Specifications for test methods Part
10、 1-2: Electrical test methods - DC resistance Cbles de communication - Spcifications des mthodes dessai Partie 1-2: Mthodes dessais lectriques - Rsistance continue Kommunikationskabel - Spezifikation fr Prfverfahren Teil 1-2: Elektrische Prfverfahren - Gleichstromwiderstand This European Standard wa
11、s approved by CENELEC on 2000-12-01. 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 concerning suc
12、h 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 into its own l
13、anguage 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, Norway, Portuga
14、l, Spain, Sweden, Switzerland and United Kingdom.EN 50289-1-2:2001 2 Foreword This European Standard was prepared by SC 46XC, Multicore, Multipair and Quad Data communication cables, of Technical Committee CENELEC TC 46X, Communication cables. The text of the draft was submitted to the formal vote a
15、nd was approved by CENELEC as EN 50289-1-2 on 2000-12-01. 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) 2002-01-01 - latest date by which the national standards conflictin
16、g with the EN have to be withdrawn (dow) 2004-01-01 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. _ 3 EN 50289-1-2:2001 Contents Foreword . 2 1 Scope 4 2 Normative references 4 3 Definiti
17、ons . 4 4 Test method. 4 4.1 Equipment .4 4.2 Test sample .5 4.3 Procedure 5 5 Expression of test results 5 5.1 Expression.5 5.2 Temperature correction.6 6 Test report . 6EN 50289-1-2:2001 4 1 Scope This Part 1-2 of EN 50289 details the test methods to determine the DC resistance characteristics of
18、the conductors of cables used in analogue and digital communication systems. These characteristics are described by the conductor resistance, loop resistance and resistance unbalance. It is to be read in conjunction with Part 1-1 of EN 50289, which contains essential provisions for its application.
19、2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisi
20、ons 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 publication referred to applies (including amendments). EN 50289-1-1 2001 Communication cables Specifications for tests methods Par
21、t 1-1: Electrical test methods General requirements EN 50290-1-2 1) Communication cables - Part 1-2: Definitions 3 Definitions For the purposes of this European Standard the definitions of EN 50290-1-2 apply in addition to the following ones. 3.1 resistance the resistance describes the electrical DC
22、 resistance of a conductor or a screen. In a finished twisted pair additional resistance due to the twisting of the conductors is included 3.2 loop resistance the loop resistance specifies the electrical DC resistance of the two conductors including the additional resistance caused by the twisting o
23、f any 3.3 resistance unbalance the resistance unbalance R ub , in percent, is the difference value of two symmetrically applied conductors 4 Test method 4.1 Equipment The resistance shall be measured by means of equipment capable of measuring accurately to within 0,5 % of the values to be determined
24、.1)At draft stage 5 EN 50289-1-2:2001 4.2 Test sample The length of the cable under test (CUT) shall be known to within an accuracy better than 1 %. Both ends of the CUT shall be prepared, such that the current flows through all elements of the circuit under test and that the contact resistance can
25、be neglected with respect to the result. 4.3 Procedure For the evaluation of the conductor resistance and the resistance unbalance both ends of the test sample shall be connected to the terminals of the measuring device. To determine the value of the loop resistance, each pair/side of a quad or inne
26、r/outer conductor shall be measured from one end, with the other end short-circuited. Alternatively the loop resistance can be determined by the addition of the two individual conductor values. The current density shall not exceed 1 A/mm of conductor to avoid any significant increase of temperature
27、during the test. The ambient temperature shall be recorded. 5 Expression of test results 5.1 Expression The test results should be normalized to the reference length N. N L R R m = ( /N) (1) where R = resistance of reference length at measuring temperature; R m = measured resistance value of the CUT
28、 in ; L = length of sample in m; N= reference length in m. The resistance unbalance between conductors of pair or in the same side of a quad is % 100 R R R - R R min max min max ub + = (2) where R ub = resistance unbalance; R max = resistance in ohms () for the conductor with the higher resistance v
29、alue; R min = resistance in ohms () for the conductor with the lower resistance value.EN 50289-1-2:2001 6 5.2 Temperature correction The measured value, shall be corrected to the standard temperature of 20 C. For copper conductors the resistance shall be corrected to the standard temperature by mult
30、iplying the measured value by the factor k: () 20 - T 00393 , 0 1 1 k + = (3) where T= temperature in degrees Celsius of the CUT during the measurement. For other conductor materials factor k shall be indicated in the relevant cable specification. 6 Test report The test report shall give the test co
31、nditions: - temperature, - sample length, and record the corrected values for the reference length - conductor(s) resistance, - loop resistance, - resistance unbalance, as required in the relevant cable specification.blankBS EN 50289-1-2:2001 BSI 389 Chiswick High Road London W4 4AL BSI British Stan
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