BS EN 50289-1-6-2002 Communication cables Specifications for test methods Electrical test methods Electromagnetic performance《通信电缆 试验方法规范 电气试验方法 电磁性能》.pdf

1、BRITISH STANDARD BS EN 50289-1-6:2002 Communication cables Specifications for test methods Part 1-6: Electrical test methods Electromagnetic performance The European Standard EN 50289-1-6:2002 has the status of a British Standard ICS 33.120.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY

2、 COPYRIGHT LAWBS EN 50289-1-6:2002 This British Standard, having been prepared under the direction of the Electrotechnical Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 18 April 2002 BSI 18 April 2002 ISBN 0 580 39593 6 Nati

3、onal foreword This British Standard is the official English language version of EN 50289-1-6:2002. The UK participation in its preparation was entrusted to Technical Committee EPL/46, Cables, wires and waveguides, RF connectors and accessories for communication and signalling, which has the responsi

4、bility 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 under the section en

5、titled “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 application. Compl

6、iance 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 related international

7、 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 55 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued

8、 since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 50289-1-6 NORME EUROPENNE EUROPISCHE NORM March 2002 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue

9、 de Stassart 35, B - 1050 Brussels 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50289-1-6:2002 E ICS 33.120.10 English version Communication cables - Specifications for test methods Part 1-6: Electrical test methods - Elec

10、tromagnetic performance Cbles de communication - Spcifications des mthodes dessai Partie 1-6: Mthodes dessais lectriques - Performance lectromagntique Grundnorm fr Kommunikationskabel - Spezifikationen fr Prfverfahren Teil 1-6: Elektrische Prfverfahren - Elektromagnetisches Verhalten This European S

11、tandard was approved by CENELEC on 2000-11-01. 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 conc

12、erning 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 (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into

13、 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, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands

14、, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EN 50289-1-6:2002 - 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 50289-1-6 o

15、n 2000-11-01. 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) 2002-10-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2003-11

16、-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 50289-1-6:2002 Contents 1 Scope 5 2 Normative references 5 3 Definitions 5 4 Survey of electromagnetic test methods 6 4.1 General

17、 6 4.2 Transfer impedance Z T and capacitive coupling impedance Z F6 4.3 Screening attenuation 7 4.4 Normalised screening attenuation . 9 4.5 Coupling attenuation 10 5 Theoretical background 10 5.1 General 10 5.2 Matched inner and outer circuit . 12 5.3 Matched inner and mismatched outer circuit. 13

18、 6 Transfer impedance, triaxial method. 16 6.1 Introduction 16 6.1.1 Inner and outer circuit 16 6.1.2 Transfer impedance Z T16 6.1.3 Coupling length 16 6.2 Test method. 16 6.2.1 Equipment 16 6.2.2 Test sample . 17 6.2.2.1 General 17 6.2.2.2 Coaxial cables 17 6.2.2.3 Screened symmetrical cables 18 6.

19、2.2.4 Screened multi-conductor cables 18 6.2.3 Calibration procedure 19 6.2.4 Test set-up. 19 6.2.4.1 General 19 6.2.4.2 Impedance of inner system 19 6.2.4.3 Impedance matching circuit . 20 6.2.5 Measuring procedure. 21 6.2.5.1 General 21 6.2.5.2 Evaluation of test results 21 6.3 Expression of test

20、results. 22 6.3.1 Expression . 22 6.3.2 Temperature correction . 22 6.4 Test report . 22 6.5 Non-reference measurements (informative) 22 7 Transfer impedance, line injection method 23 7.1 Introduction 23 7.1.1 Inner and outer circuit 23 7.1.2 Transfer impedance Z T23 7.1.3 Sample length 24 7.2 Test

21、method. 24 7.2.1 Equipment 24 7.2.2 Test sample . 25 7.2.2.1 Preparation of test sample. 25 7.2.3 Calibration 25 7.2.4 Test set-up. 27 7.2.4.1 General 27 7.2.4.2 Impedance of inner system 27 7.2.4.3 Impedance matching circuit . 28EN 50289-1-6:2002 - 4 - 7.2.5 Measuring procedure. 29 7.2.6 Evaluation

22、 of test results 30 7.3 Expression of test results. 31 7.3.1 Expression . 31 7.3.2 Temperature correction . 31 7.4 Test report . 31 8 Screening attenuation test method, triaxial method 31 8.1 Introduction 31 8.1.1 Inner and outer circuit 31 8.1.2 Screening attenuation 32 8.1.3 Related lengths 32 8.2

23、 Test method. 33 8.2.1 Equipment 33 8.2.2 Test sample . 33 8.2.2.1 General 33 8.2.2.2 Coaxial cables 33 8.2.2.3 Screened symmetrical cables 34 8.2.2.4 Screened multi-conductor cables 34 8.2.3 Calibration procedure 34 8.2.4 Test set-up. 35 8.2.4.1 General 35 8.2.4.2 Impedance of inner system 35 8.2.4

24、.3 Impedance matching circuit . 36 8.2.5 Measuring procedure. 37 8.2.6 Evaluation of test results 38 8.3 Expression of test results. 39 8.3.1 Expression . 39 8.3.2 Temperature correction . 40 8.4 Test report . 40 9 Coupling attenuation or screening attenuation, absorbing clamp method 40 9.1 Introduc

25、tion 40 9.1.1 Coupling Attenuation or Screening attenuation . 40 9.2 Test method. 40 9.2.1 Equipment 40 9.2.1.1 General 40 9.2.1.2 Balun requirements 42 9.2.2 Test sample . 43 9.2.2.1 Tested cable length 43 9.2.2.2 Preparation of test sample. 43 9.2.3 Calibration procedure . 44 9.2.3.1 Attenuation o

26、f the measuring set-up. 44 9.2.3.2 Insertion loss of the absorbers. 47 9.2.4 Test set-up. 48 9.2.5 Test set-up verification. 50 9.2.5.1 Determination of measurement sensitivity of the set-up 50 9.2.5.2 Verification of test set-up calibration 50 9.2.5.3 Pulling force on cable. 50 9.2.6 Measuring proc

27、edure. 50 9.3 Expression of test results. 51 9.3.1 Expression . 51 9.4 Test report . 52 9.4.1 General 52 9.4.2 Evaluation of test results (informative). 52 9.4.3 Examples . 53- 5 - EN 50289-1-6:2002 1 Scope This EN 50289-1-6 details four different test methods to determine the electromagnetic perfor

28、mance characteristics of cables used in analogue and digital communication systems. The four methods are detailed in clauses 6 to 9. This document discusses test methods aiming to facilitate a selection of the applicable electromagnetic test method. It is to be read in conjunction with Part 1-1 of E

29、N 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 appropriate places in the text and the publications are listed h

30、ereafter. 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 publication referred to applies (including amendments). EN 50289-

31、1-1 2001 Communication cables - Specifications for tests methods - Part 1-1: Electrical test methods - General requirements EN 50289-1-9 2001 Communication cables - Specifications for tests methods - Part 1-9: Electrical test methods - Unbalance attenuation (longitudinal conversion loss, longitudina

32、l conversion transfer loss) EN 50290-1-2 1) Communication cables - Part 1-2: Definitions IEC 61196-1 1995 Radio-frequency cables Part 1: Generic specification - General, definitions, requirements and test methods CISPR 16-1 + A1 1993 1997 Specification for radio disturbance and immunity measuring ap

33、paratus and methods Part 1: Radio disturbance and immunity measuring apparatus ITU-T Recommendation O.9 1988 Series O - Specifications of measuring equipment - General - O.9: Measuring arrangements to assess the degree of unbalance about earth ITU-T Recommendation G.117 1996 Series G - Transmission

34、systems and media, digital systems and networks - International telephone connections and circuits - General recommendations on the transmission 3 Definitions For the purposes of this European Standard, the definitions of EN 50290-1-2 apply.1)At draft stage.EN 50289-1-6:2002 - 6 - 4 Survey of electr

35、omagnetic test methods 4.1 General The electromagnetic performance of unbalanced cables (e.g. coaxial RF-cables) is determined only by the quality of the screen. In the case of balanced cables the electromagnetic performance is determined by the combined result of both unbalance attenuation and the

36、effect of screen(s), if any. The quality of the screen may be evaluated by the measurement of transfer impedance (clauses 6 and 7) or screening attenuation (clauses 8 and 9). The combined result of the unbalance attenuation and the screening attenuation (if applicable) may be evaluated using the cou

37、pling attenuation test method (clause 9). 4.2 Transfer impedance Z T and capacitive coupling impedance Z F Two important properties in characterising screening effectiveness of cables are transfer impedance Z Tand capacitive coupling admittance Y Crespectively capacitive coupling impedance Z F . The

38、se properties can be used to calculate the normalised screening attenuation in dB (see 4.4) The transfer impedance Z Tof an electrically short uniform cable is defined as the quotient of the longitudinal voltage induced in the outer circuit (environment) to the current in the inner circuit (cable) o

39、r vice versa, related to unit length (see IEC 61196-1, 12.1.2.1). Z U IL T 2 1 = (1) where L coupling length I 1 U 2 Figure 1 - Definition of transfer impedance Z T The capacitive coupling admittance Y Cof an electrically short uniform cable is defined as the quotient of the current in the inner cir

40、cuit caused by the capacitive coupling to the voltage in the outer circuit, related to unit length (see IEC 61196-1, 12.1.2.1). Y I UL jC C 1 2 T = = (2) where C T through capacitance L coupling length I 1 U 2 C T Figure 2 - Definition of coupling admittance- 7 - EN 50289-1-6:2002 The through capaci

41、tance C Tand thus the capacitive coupling admittance Y Care dependent on the permittivity and geometry of the outer circuit. In order to have a quantity which is invariant on the permittivity and the geometry of the outer circuit and is also comparable to the transfer impedance Z Twe introduce the c

42、apacitive coupling impedance Z F . ZZZY F12C = (3) where Z 1 characteristic impedance of inner circuit Z 2 characteristic impedance of outer circuit Y C capacitive coupling admittance If there are no holes in the screen C Tand Z Fare zero. This is the case for a foil and for double braided screen co

43、nstruction. But in a single braided construction Z Tand Z Fare about the same and Z Fmust be taken into consideration. With electrically short cables, where wave propagation can be neglected, the transfer impedance can be simply obtained as measuring current and voltage. Therefore the transfer imped

44、ance is a suitable criteria to describe the screening effectiveness of electrically short uniform cables. IEC 61196-1 contains two methods - the triaxial and line injection methods - describing how to measure the transfer impedance of coaxial RF-cables. Clauses 6 and 7 of this standard extend these

45、methods for symmetrical and multi conductor cables as well. In addition this standard provides guidance on impedance matching circuits to be used if the cable impedance is different from the impedance of the test equipment. The triaxial method only allows measurements at low frequencies (max. 100 MH

46、z) while the line injection method applies for higher frequencies. 4.3 Screening attenuation With electrically short cables, where wave propagation can be neglected, the screening quantities related to unit length can be obtained as measurement values and directly used to calculate an induced distur

47、bing voltage. In the higher frequency range the transmission characteristics are dependent on the impedance and admittance per unit length as well as on the terminating resistors. The screening attenuation is a suitable criteria to describe the screening effectiveness of electrically long cables. Th

48、e screening attenuation is defined as the logarithmic ratio of the power fed into the cable and the radiated maximum peak power: a P P s feed rad = 10 10 log ,max (4) For electrically long cables - in a frequency range where the transfer impedance of the cable screen is proportional to frequency - t

49、he screening attenuation is length and frequency independent.EN 50289-1-6:2002 - 8 - The screening attenuation is related to the transfer impedance in one of the following ways: a) for a matched outer circuit (cable environment) for example in the absorbing clamp method (see clause 9 or IEC 61196-1, 12.4); a ZZ cZ TE rr s,matched far end near end = 20 10 12 12 log (5) T F TE Z Z Z = max (6) where “+“ applies for the near end “-“ applies for the far end Z T transfer impedance Z F capacitive coupling impedanc