1、BRITISH STANDARD 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 BS EN 50289-1-2:2001 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIG
2、HT LAW BS EN 50289-1-2:2001 Amd. No. National foreword Date I Comments This British Standard is the official English language version of The UK participation in its preparation was entrusted by Technical Committee EPU46, Cables, wire and waveguides, RF connectors, and accessories for communication a
3、nd signalling, to Subcommittee EPL/46/1, Communication cables, which has the responsibility to: EN 50289-1-22001. - - 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;
4、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 European publications referred to in
5、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 necessary provisions of a contract. U
6、sers 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 been prepared under the direction of the Electrotechnical Sector Committee title, was published under t
7、he authority of the Standards Committee and comes into effect on 15 August 2001 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
8、document was last issued. O BSI 07-2001 ISBN O 580 38036 X EUROPEAN STANDARD EN 50289-1-2 NORME EUROPENNE EUROPISCHE NORM May 2001 ICs 33.120.20 English version Communication cables - Specifications for test methods Part 1-2: Electrical test methods - DC resistance Cbles de communication - Kommunika
9、tionskabel - Spcifications des mthodes dessai Partie 1-2: Mthodes dessais lectriques - Rsistance continue Gleichstromwiderstand Spezifikation fr Prfverfahren Teil 1-2: Elektrische Prfverfahren - This European Standard was approved by CENELEC on 2000-1 2-01. CENELEC members are bound to comply with t
10、he CENKENELEC 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 o
11、r 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 status as the offic
12、ial 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 European Committee for
13、 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 for CENELEC member
14、s. Ref. No. EN 50289-1-2:2001 E 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 and was approved
15、 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 - latest date by which the national standards conflicting national standard or by endorsement (dop) 2002-01 -01 with the EN
16、have to be withdrawn (dow) 2004-01-01 o 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 Definitions . 4 4 Te
17、st method . 4 4.1 Equipment . 4 4.2 Test sample . 5 4.3 Procedure 5 Expression of test results 5 5.1 Expression . 5 5.2 Temperature correction . 6 a 6 Test report . 6 5 a EN 50289-1 -212001 -4- 1 Scope This Part 1-2 of EN 50289 details the test methods to determine the DC resistance characteristics
18、of the conductors of cables used in analogue and digital communication systems. These characteristics are described by the conductor resistance, loop resistance and resistance un balance. It is to be read in conjunction with Part 1-1 of EN 50289, which contains essential provisions for its a ppl cat
19、 ion. 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
20、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 publication referred to applies (including amendments). EN 50289-1-1 2001 Communication cables - Specifications for tests met
21、hods Part 1-1 : Electrical test methods - General requirements EN 50290-1-2” 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 elec
22、trical DC 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 t
23、wisting of any 3.3 resistance unbalance the resistance unbalance Rub, 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 f 0,5 % of the values to be d
24、etermined. ) At draft stage - -5- EN 50289-1-2:2001 0 4.2 Test sample The length of the cable under test (CUT) shall be known to within an accuracy better than Il %. Both ends of the CUT shall be prepared, such that the current flows through all elements of the circuit under test and that the contac
25、t resistance can 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 pairlside
26、of a quad or innerlouter 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/mm2 of conductor to avoid any significant increa
27、se of temperature during the test. The ambient temperature shall be recorded. O 5 Expression of test results 5.1 Expression The test results should be normalized to the reference length N. where R = resistance of reference length at measuring temperature; R, = measured resistance value of the CUT in
28、 Q; 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 R max - R min R max + R min Rub = XlOO % where Rub = resistance unbalance; R, = Rmin = resistance in ohms (Q) for the conductor with the higher resistance va
29、lue; resistance in ohms (Q) for the conductor with the lower resistance value. EN 50289-1-2:2001 5.2 Temperature correction -6- a! The measured value, shall be corrected to the standard temperature of 20 OC. For copper conductors the resistance shall be corrected to the standard temperature by multi
30、plying the measured value by the factor k: 1 1 + 0,00393(T - 20) k= 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 conditions:
31、 - temperature, - sample length, and record the corrected values for the reference length - conductor(s) resistance, - loop resistance, - resistance unbalance, (3) as required in the relevant cable specification. BS EN 502 89-1-2:200 1 BSI 389 Chiswick High Road London w4 4AL BSI - British Standards
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