1、BRITISH STANDARD BS EN 50289-1-12:2005 Communication cables Specifications for test methods Part 1-12: Electrical test methods Inductance The European Standard EN 50289-1-12:2005 has the status of a British Standard ICS 33.120.20 BS EN 50289-1-12:2005 This British Standard was published under the au
2、thority of the Standards Policy and Strategy Committee ISBN 0 580 46037 1 National foreword This British Standard is the official English language version of EN 50289-1-12:2005. The UK participation in its preparation was entrusted by Technical Committee EPL/46, Cables, Wires and Waveguides, R.F. Co
3、nnectors and Accessories for Communication and Signalling, to Subcommittee EPL/46/1, Communication Cables, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement intern
4、ational or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purpo
5、rt to include all the necessary provisions of a contract. Users are responsible for its 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 international/European committee
6、 any enquiries on the interpretation, or proposals for change, and keep the UK 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 6, an
7、 inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments on 12 July 2005 BSI 12 July 2005EUROPEAN STANDARD EN 50289-1-12 NORME EUROPENNE EUROPISCHE NORM April 2005
8、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 2005 CENELEC - All rights of exploitation in any form and by any means reserved
9、worldwide for CENELEC members. Ref. No. EN 50289-1-12:2005 E ICS 33.120.20 English version Communication cables - Specifications for test methods Part 1-12: Electrical test methods - Inductance Cbles de communication - Spcifications des mthodes dessai Partie 1-12: Mthodes dessais lectriques - Induct
10、ance Kommunikationskabel - Spezifikationen fr Prfverfahren Teil 1-12: Elektrische Prfverfahren - Induktivitt This European Standard was approved by CENELEC on 2004-12-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this Euro
11、pean 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 CENELEC member. This European Standard exists in three official versions (Eng
12、lish, 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 versions. CENELEC members are the national electrotechnical committees of Austria,
13、 Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 50289-1-12:2005 2 Foreword This E
14、uropean Standard was prepared by the CENELEC Technical Committee TC 46X, Communication cables. The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as EN 50289-1-12 on 2004-12-01. The following dates were fixed: latest date by which the EN has to be impl
15、emented at national level by publication of an identical national standard or by endorsement (dop) 2005-12-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2007-12-01 This European Standard has been prepared under the European Mandate M/212 given to C
16、ENELEC by the European Commission and the European Free Trade Association. _ 3 EN 50289-1-12:2005 Contents 1 Scope.4 2 Normative references.4 3 Definitions.4 4 Test method5 4.1 Equipment. 5 4.2 Test sample 5 4.3 Calibration. 5 4.4 Test set-up 5 4.5 Measuring procedure. 5 5 Expression of test results
17、 .5 6 Test report6 EN 50289-1-12:2005 4 1 Scope This Part 1-12 of EN 50289 details the test methods to determine the inductance characteristics of cables used in analogue and digital communication systems. It is to be read in conjunction with EN 50289-1-1, which contains essential provisions for its
18、 application. 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 50289-1-1
19、 2001 Communication cables Specifications for tests methods Part 1-1: Electrical test methods General requirements EN 50289-1-2 2001 Communication cables Specifications for tests methods Part 1-2: Electrical test methods DC resistance EN 50289-1-11 2001 Communication cables Specifications for tests
20、methods Part 1-11: Electrical test methods Characteristic impedance, input impedance, return loss EN 50290-1-2 2004 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 inducta
21、nce the inductance (L) of a pair (or with respect to the side of a quad) is the effective inductance of instrumentation cables. Inductance and mutual capacitance are parameters which describe the possibility of storing electrical energy in this kind of cables At any (low) frequency, the impedance of
22、 a cable can be represented by two components - resistance (R) and reactance (X) - or as a polar function having magnitude (Z) and phase (). The impedance may be represented by either a series or parallel circuit. For the series case R = Z * cos () and X = Z * sin () where Z = (R 2+ X 2 ) tan () = X
23、/R and for inductance X = 2 fL Inductances have to be measured normally at low frequencies (50 Hz, 800 Hz or 1 000 Hz) as required in the relevant cable specification. For this case the resistance (R) has to be measured as described in EN 50289-1-2. R is the DC-resistance of a pair (= loop resistanc
24、e = the resistance of the two conductors of the pair) or a side of a quad. 5 EN 50289-1-12:2005 4 Test method 4.1 Equipment The measurements can be performed using a network analyser (or alternatively a discrete signal generator and receiver), an LCR-meter or an impedance-measuring-bridge (Wheatston
25、e-, Maxwell- Bridge). Maximum inaccuracy of measuring equipment: 2 % 50 nH. 4.2 Test sample The test sample shall have a length of 10 m up to 100 m. The measuring may be performed at a delivery length, if the attenuation of the cable is small enough. Practically this means that the two values of mea
26、suring the input impedance at the near end of the cable are different (ZO/ZS 2) while the CUT is opened or shorted at the far end. 4.3 Calibration The influence of the connecting cables, used for connection of the CUT to the equipment, shall be measured at the relevant frequency. The calibration pro
27、cedure for network analysers (similar for LCR-meters) is given in EN 50289-1-11. 4.4 Test set-up The test set-up is given in EN 50289-1-11 for measuring the input impedance with open/short method. 4.5 Measuring procedure The test sample shall be connected to the equipment and the testing has to be p
28、erformed like described in EN 50289-1-11 for measuring the input impedance with open/short method. Network analysers or LCR-meters will show the value of inductance directly. In other cases the equation given in 3.1 of this part has to be used to calculate the inductance. 5 Expression of test result
29、s The test results shall be normalized to the refence length of 1 km. L = (Lm/Length) * 1 000 (mH/km) where L = inductance of reference length Lm = measured inductance in mH Length = length of sample in m EN 50289-1-12:2005 6 6 Test report The test report shall give the test conditions: temperature,
30、 sample length and record the corrected values for the reference length. _ blankBS EN 50289-1-12:2005 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 view on standards in E
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