1、BRITISH STANDARD C ornrnunication 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 BS EN 50289-1-612002 Wk present to the responsible European committee an
2、y 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. - A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cr oss-r e fe
3、r enc e s 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 entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic C
4、atalogue. 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. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document
5、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. O BSI 18 April 2002 ISBN O 580 39593 6 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 50289-1-6 Marc
6、h 2002 ICs 33.120.10 English version Communication cables - Specifications for test methods Part 1-6: Electrical test methods - Elect romag net ic pe ro r mance Cbles de communication - S pcif ications des mthodes dessai Partie 1-6: Mthodes dessais lectriques - Perform an ce lectro mag n t iq u e Gr
7、und norm fr Kom muni kations ka bel - S pezif i kat ion en fr Prfvetfa h ren Teil 1-6: Elektrische Prfverfahren - Elektromagnetisches Verhalten This European Standard was approved by CENELEC on 2000-1 1-01, CENELEC members are bound to comply with the CENKENELEC Internal Regulations which stipulate
8、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 CENELEC member. This European Standard exi
9、sts 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 versions. CENELEC members are the national eled
10、rotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europ
11、en de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels O 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 EN 50289-1 -6
12、:2002 -2- Foreword This European Standard was prepared by the Technical Committee CENELEC TC 46X, Com mu ni cation cables. The text of the draft was submitted to the formal vote and was approved by CENELEC as EN 50289-1 -6 on 2000-1 1-01. The following dates were fixed: - latest date by which the EN
13、 has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2002-1 0-01 - latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2003-1 1-01 This European Standard has been prepared under the European Manda
14、te M/212 given to CENELEC by the European Commission and the European Free Trade Association. -3- EN 50289-1 -612002 Contents 1 Scope 5 2 Normative references 5 3 Definitions 5 4 Survey of electromagnetic test methods . 6 4.3 Screening attenuation . 7 4.4 Normalised screening attenuation 9 4.5 Coupl
15、ing attenuation . 10 . . 6 5 Theoretical background 5.1 General 5.2 Matched inner and outer circuit 5.3 Matched inner and mismatched outer circuit 6 Transfer impedance, triaxial method 16 6.1 Introduction . 16 6.1 .I Inner and outer circuit . 16 16 6.1.3 Coupling length 6.2 Test method . 6.2.2.2 Coa
16、xial cables 17 6.2.2.3 Screened symmefrical cables 18 6.2.2.4 Screened mulfi-conducfor 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 sysfem 19 6.2.4.3 Impedance mafching crrcurf . 20 6.2.5 Measuring procedure 21 6.2.5.1 General. 21
17、6.2.5.2 Evaluafion of fesf resulfs 21 6.3 Expression of test results 22 6.4 Test report . 6.3.1 Expression . 6.3.2 Temperature CO 6.5 Non-reference measurements (informative) . 7 Transfer impedance, line injection method 23 7.1 Introduction . 23 7.1 .I Inner and outer circuit . 23 7.1.2 Transfer imp
18、edance ZT . 7.1.3 Sample length 7.2 Test method . 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 sysfem 27 7.2.4.3 Impedance mafching crrcurf . 28 . EN 50289-1 -6:2002 -4- 7.2.5 Measuring procedure . 29 7.2.6 Evaluation of test results 7.3 Expression of t
19、est results 7.3.1 Expression 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 .I Inner and outer circuit 31 8.1.2 Screening attenuation 8.1.3 Related lengths 8.2 Test method . 8.2.1 Equipment 33 8.2.2 Test sample .
20、 33 8.2.2.1 General 33 8.2.2.2 Coaxial cables . . . . 33 8.2.2.3 Screened symmefrical cables _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 34 8.2.2.4 Screened mulfi-conducfor cables _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
21、_ _ _ _ _ _ _ _ _ 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 sysfem 35 8.2.4.3 Impedance mafching crrcurf _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 36 8.2.5 Measuring procedure . 37 8.2.
22、6 Evaluation of test results 8.3 Expression of test results 8.3.1 Expression 8.3.2 Temperature correction . 40 8.4 Test report . 40 9 Coupling attenuation or screening attenuation, absorbing clamp method 40 9.1 Introduction 40 9.1 .I Coupling Attenuation or Screening attenuation . 40 9.2 Test method
23、 40 9.2.1 Equipmen 40 9.2.1.1 General 40 9.2.1.2 Balun requiremenfs . _ _ _ _ _ _ _ _. _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _. 42 9.2.2 Test sample . 43 9.2.2.1 Tesfed cable lengfh 43 9.2.2.2 Preparafion of fesf sample _ _ _ _ _ _ _ _ _ _ _ _ _ _
24、_ _ _. _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _. 43 9.2.3 Calibration procedure . 44 9.2.3.1 Affenuafion of fhe measuring sef-up _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 44 9.2.3.2 Insertion loss of fhe absorbers . 47 9.2.4 Test set-u
25、p . 48 9.2.5 Tesf sef-up verificafion . 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 Meas ur ng proced Ure 50 9.3 Expression of test result 51 9.3.1 Expression . 51 9.4 Test report .
26、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 performance characteristics of cables used in analogue and digital communication systems.
27、 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 EN 50289, which contains essential provisions for its application. 2 Normative refer
28、ences 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 revisions of any of the
29、se 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 EN 50289-1-9 EN 50290-1-2 I EC 61 196-1 CISPR 16-1 + AI ITU-T Recommendation 0.
30、9 ITU-T Recommendation G.117 3 Definitions 2001 2001 1) 1995 1993 1997 1988 1996 Communication cables - Specifications for tests methods - Part 1-1 : Electrical test methods - General requirements Communication cables - Specifications for tests methods - Part 1-9: Electrical test methods - Unbalance
31、 attenuation (long i tu d i na1 conversion I oss , long i tud i na1 conversion transfer I oss) Communication cables - Part 1-2: Definitions Radio-freq uency cables Part 1 : Generic specification - General, definitions, requirements and test methods Specification for radio disturbance and immunity me
32、asuring apparatus and methods Part 1 : Radio disturbance and immunity measuring apparatus Series O - Specifications of measuring equipment - General - 0.9: Measuring arrangements to assess the degree of unbalance about earth Series G - Transmission systems and media, digital systems and networks - I
33、nternational telephone connections and circuits - General recommendations on the transmission For the purposes of this European Standard, the definitions of EN 50290-1-2 apply. At draft stage EN 50289-1 -6:2002 -6- 4 Survey of electromagnetic test methods 4.1 General The electromagnetic performance
34、of unbalanced cables (e.9. 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 effect of screen(s), if any. The quality of the screen may be evalu
35、ated 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 coupling attenuation test method (clause 9). 4.2 Transfer impedance ZT
36、 and capacitive coupling impedance ZF Two important properties in characterising screening effectiveness of cables are transfer impedance ZT and capacitive coupling admittance Yc respectively capacitive coupling impedance ZF. These properties can be used to calculate the normalised screening attenua
37、tion in dB (see 4.4) The transfer impedance ZT of 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) or vice versa, related to unit length (see IEC 61 196-1, 12.1.2.1). wher
38、e L u2 ZT =- I, .L coupling length 4 Figure 1 - Definition of transfer impedance ZT The capacitive coupling admittance Yc of an electrically short uniform cable is defined as the quotient of the current in the inner circuit caused by the capacitive coupling to the voltage in the outer circuit, relat
39、ed to unit length (see IEC 61196-1, 12.1.2.1). where CT L 1 = j where “+“ applies for the near end applies for the far end “ “ ZT transfer impedance ZF capacitive coupling impedance ZTE effective transfer impedance when the capacitive coupling is present (single braided screen) or b) for a mismatche
40、d outer circuit (cable environment) - with a short circuit at the near end - for example in the shielded screening attenuation method (see clause 8 or IEC 61 196-1, 12.6): Respectively neglecting of the capacitive coupling In many cases the capacitive coupling can be neglected. In this case also the
41、 near end coupling in a matched outer circuit can be neglected (equation 5). Then the difference between these equations is: / i for Er1 = 1,6 and EQ = 1 ,I this difference is da, = 1,5 dB. where ZT Z1 z2 C Er1 transfer impedance of cable screen characteristic impedance of cable (inner circuit) char
42、acteristic impedance of outer circuit (environment) velocity of light, 3.108 m/s resulting relative permittivity of the dielectric of the cable resulting relative permittivity of the environment r2 -9- EN 50289-1 -6:2002 4.4 Normalised screening attenuation The screening attenuation is highly depend
43、ent on the velocity difference between the inner and outer circuit. Therefore the test results of the screening attenuation may also be presented in normalised conditions. The normalised conditions are Av/vl = 10% or ,/*= 1,l and Z2 becomes the normalised impedance Z, = 150 Cl. The difference betwee
44、n the normalised screening attenuation and the measured screening attenuation is cal cu lated by: as,n = a, +da (10) where as,n is the normalised screening attenuation as,n = 20. loglo 64-cG II = L 27c.L .f .L =27c.I - The point of intersection between the asymptotic values for low and high frequenc
45、ies is the so- called cut-off frequency fc: C fc,n Lc = (22) f 7c . I& f 61 With equation (22) we have the condition for electrical short or long cables. The cable is electrical short if C fnL 3 The functional equation (Figure 5) 11 - e-jq I = 12 sin with cp = (pl, cp2, cp3 (28) shows, that the equa
46、tion of the voltage ratio contains three periodic partial functions of the ratio coupling length L, to wave length ho: U 1 2 3 4 5 VAG Figure 5 - Calculated periodic functions for G, = 2,3 and lr2 = 1,l An example of the theoretical curve of the voltage ratio is shown in Figure 6 and Figure 7. Figur
47、e 6 with a logarithmic scale to extend the lower frequency range and Figure 7 with a linear scale up to very high frequencies. - 15 - EN 50289-1 -6:2002 -40 -50 60 70 80 u o1 o1 1 10 100 1 O00 f/MHz Figure 6 - Calculated voltage ratio using a logarithmic scale -40 -60 -70 -801 U 500 1000 1500 5000 2
48、500 30( f/MHz Figure 7 - Calculated voltage ratio using a linear scale From equation (26) we obtain periodic maximum values of the voltage ratio, which are independent of the load resistor R2,f - provided that R2,f I Z2 - and of coupling cable length L,. In Figures 4, 6 and 7 the envelope rise is reached with the first maximum of the wide period at C f.L - 2.IJErl-JT-1 In this frequency range ZT can be calculated if ZF is negligible For low frequencies, when L, 10 dB. 6.2.2 Test sample 6.2.2.1 General The tes
