IEC 62153-4-4-2015 Metallic communication cable test methods - Part 4-4 Electro Magnetic Compatibility (EMC) - Test method for measuring of the screening attenu.pdf

1、 IEC 62153-4-4 Edition 2.0 2015-04 INTERNATIONAL STANDARD Metallic communication cable test methods Part 4-4: Electromagnetic compatibility (EMC) Test method for measuring of the screening attenuation a sup to and above 3 GHz, triaxial method IEC 62153-4-4:2015-04(en) colour inside THIS PUBLICATION

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11、ATIONAL STANDARD Metallic communication cable test methods Part 4-4: Electromagnetic compatibility (EMC) Test method for measuring of the screening attenuation a sup to and above 3 GHz, triaxial method INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 33.100; 33.120.10 ISBN 978-2-8322-2653-7 Registered

12、trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. colour inside 2 IEC 62153-4-4:2015 IEC 2015 CONTENTS FOREWORD . 3 1 Scope 5 2 Normative references 5 3 Symbols and theoretical background . 5 3.1 Electrica

13、l symbols . 5 3.2 Theoretical background . 6 3.3 Screening attenuation . 7 3.4 Impact of coupling length and relationship between the screening attenuation and the surface transfer impedance Z T. 7 4 Principles of the measuring method . 10 5 Measurement . 11 5.1 Equipment 11 5.2 Cable under test . 1

14、1 5.2.1 Coaxial cables . 11 5.2.2 Symmetrical and multiconductor cables . 11 5.2.3 Impedance matching 12 5.3 Procedure . 12 5.4 Expression of results 12 6 Requirement 13 Annex A (normative) Determination of the impedance of the inner circuit . 14 Annex B (informative) Example of a self-made impedanc

15、e matching adapter . 15 Annex C (informative) Reflection loss of a junction 17 Bibliography 19 Figure 1 Relationship of U 2 /U 1on a log (f) scale for a single braided cable . 8 Figure 2 Relationship of U 2 /U 1on a linear (f) scale and screening attenuation a son a linear (f) scale for a single bra

16、ided cable 9 Figure 3 Measured screening attenuation a sformed by the maximum envelope curve to the measured coupling voltage ratio U 2 /U 1of a single braided cable 9 Figure 4 Triaxial measuring set-up . 10 Figure 5 Triaxial measuring set-up connected to the network analyser . 10 Figure 6 Preparati

17、on of test sample (symmetrical and multi-conductor cables) . 12 Figure B.1 Attenuation and return loss of an 50 to 5 impedance matching adapter; logarithmic frequency scale . 15 Figure B.2 Attenuation and return loss of an 50 to 5 impedance matching adapter; linear frequency scale . 16 Figure C.1 Eq

18、uivalent circuit of generator with load . 17 IEC 62153-4-4:2015 IEC 2015 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ METALLIC COMMUNICATION CABLE TEST METHODS Part 4-4: Electromagnetic compatibility (EMC) Test method for measuring of the screening attenuation a sup to and above 3 GHz, triaxial met

19、hod FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in

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28、ublication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the pos

29、sibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 62153-4-4 has been prepared by technical committee 46: Cables, wires, waveguides, R.F. connector

30、s, R.F. and microwave passive components and accessories. This second edition cancels and replaces the first edition, published in 2006 and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition. Impedance matching ada

31、pters are no longer required when measuring devices have a characteristic impedance different from the characteristic impedance of the test equipment. The reflection loss due to a mismatch is taken into account by a (calculated) correction factor. 4 IEC 62153-4-4:2015 IEC 2015 The text of this stand

32、ard is based on the following documents: FDIS Report on voting 46/545/FDIS 46/554/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part

33、2. A list of all parts in the IEC 62153 series, published under the general title, Metallic communication cable test methods, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC website u

34、nder “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. IMPORTANT The colour inside logo on the cover

35、page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should therefore print this document using a colour printer. IEC 62153-4-4:2015 IEC 2015 5 METALLIC COMMUNICATION CABLE TEST METHODS Part 4-4: Electromag

36、netic compatibility (EMC) Test method for measuring of the screening attenuation a sup to and above 3 GHz, triaxial method 1 Scope This part of IEC 62153 describes a test method to determine the screening attenuation a sof metallic communication cable screens. Due to the concentric outer tube, measu

37、rements are independent of irregularities on the circumference and outer electromagnetic field. A wide dynamic frequency range can be applied to test even super-screened cables with normal instrumentation from low frequencies up to the limit of defined transversal waves in the outer circuit at appro

38、ximately 4 GHz. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (inc

39、luding any amendments) applies. IEC 62153-4-1, Metallic communication cable test methods Part 4-1: Electromagnetic Compatibility (EMC) Introduction to electromagnetic screening measurements 3 Symbols and theoretical background 3.1 Electrical symbols Z 1characteristic impedance of the primary circuit

40、 (cable under test) Z 2characteristic impedance of the secondary circuit Z Snormalized value of the characteristic impedance of the environment of a typical cable installation (150 ). It is in no relation to the impedance of the outer circuit of the test set-up Z 2Z Sis always 150 (arbitrary determi

41、ned) whereas Z 2is varying with the dimensions of the CUT and inner diameter of the tube R input impedance of the receiver Z Ttransfer impedance of the cable under test in /m Z F= Z 1 Z 2 j C Tcapacitive coupling impedance of the cable under test in /m f frequency in Hz C Tthrough capacitance of the

42、 outer conductor per unit length in F/m r1relative dielectric permittivity of the cable under test r2relative dielectric permittivity of the secondary circuit r2,nnormalized value of the relative dielectric permittivity of the environment of the cable l effective coupling length 0vacuum wavelength 6

43、 IEC 62153-4-4:2015 IEC 2015 C 0vacuum velocity a sscreening attenuation which is comparable to the results of the absorbing clamp method P 1feeding power of the primary circuit P 2measured power received on the input impedance R of the receiver in the secondary circuit P rradiated power in the envi

44、ronment of the cable, which is comparable to P 2,n+ P 2,fof the absorbing clamp method S 11scattering parameter S 11(complex quantity) of the set-up where the primary side of the two port is the DUT and the secondary side is the tube S 21scattering parameter S 21(complex quantity) of the set-up wher

45、e the primary side of the two port is the DUT and the secondary side is the tube ( ) 0 r2 1 r 1 / 2 l = ( ) 0 r2 1 r 2 / 2 l + = 0 r2 1 2 3 4 / l = = 3.2 Theoretical background There will be a variation of the voltage U 2on the far end, caused by the electromagnetic coupling through the screen and s

46、uperimposition of the partial waves caused by the surface transfer impedance Z T , the capacitive coupling impedance Z F (travelling to the far and near end) and the totally reflected waves from the near end. For exact calculation, if feedback from the secondary to the primary circuit is negligible,

47、 the ratio of the far-end voltages U 1and U 2are given by ( ) ( ) ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( D j C B j A j R Z c Z e Z Z Z Z U U 3 2 1 e 1 1 2 1 1 e 1 2 0 1 r2 r1 F T r2 r1 F T 1 2 + + + + /(1) i.e. formally | A + B | C D, where A C is the far-end crosstalk, B C is t

48、he reflected near- end crosstalk and D is the mismatch factor. The total oscillations of D are 3. Maximum values of A C and B C are given, if 1,2= (2N + 1) and N is an integer. The voltage ratio measured is not dependent on the diameter of the outer tube of the triaxial test set-up or on the charact

49、eristic impedance Z 2of the outer system, provided that Z 2is larger than the input impedance of the receiver. IEC 62153-4-4:2015 IEC 2015 7 A more detailed description of the subject is given in IEC 62153-4-1. 3.3 Screening attenuation The logarithmic ratio of the feeding power P 1and the periodic maximum values of the power