IEC 62153-4-7-2015 Metallic communication cable test methods - Part 4-7 Electromagnetic compatibility (EMC) - Test method for measuring of transfer impedance ZT and screening atten.pdf

1、 IEC 62153-4-7 Edition 2.0 2015-12 INTERNATIONAL STANDARD Metallic communication cable test methods Part 4-7: Electromagnetic compatibility (EMC) Test method for measuring of transfer impedance Z Tand screening attenuation a sor coupling attenuation a Cof connectors and assemblies up to and above 3

2、GHz Triaxial tube in tube method IEC 62153-4-7:2015-12(en) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2015 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic

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11、e contact the Customer Service Centre: csciec.ch. IEC 62153-4-7 Edition 2.0 2015-12 INTERNATIONAL STANDARD Metallic communication cable test methods Part 4-7: Electromagnetic compatibility (EMC) Test method for measuring of transfer impedance Z Tand screening attenuation a sor coupling attenuation a

12、 Cof connectors and assemblies up to and above 3 GHz Triaxial tube in tube method INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 33.100; 33.120.10 ISBN 978-2-8322-3054-1 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an

13、 authorized distributor. colour inside 2 IEC 62153-4-7:2015 IEC 2015 CONTENTS FOREWORD . 5 INTRODUCTION . 7 1 Scope 8 2 Normative references 8 3 Terms and definitions 8 4 Physical background 10 5 Principle of the test methods . 10 5.1 General . 10 5.2 Transfer impedance 12 5.3 Screening attenuation

14、. 12 5.4 Coupling attenuation . 12 6 Test procedure 13 6.1 General . 13 6.2 Tube in tube procedure . 13 6.3 Test equipment . 14 6.4 Calibration procedure 15 6.5 Connection between extension tube and device under test . 15 6.6 Dynamic range respectively noise floor . 15 6.7 Impedance matching . 16 6.

15、8 Influence of Adapters 16 7 Sample preparation . 17 7.1 Coaxial connector or device 17 7.2 Balanced or multiconductor device 17 7.3 Cable assembly 19 8 Measurement of transfer impedance 19 8.1 General . 19 8.2 Principle block diagram of transfer impedance 19 8.3 Measuring procedure Influence of con

16、necting cables . 19 8.4 Measuring . 20 8.5 Evaluation of test results . 20 8.6 Test report 20 9 Screening attenuation 21 9.1 General . 21 9.2 Impedance matching . 21 9.2.1 General . 21 9.2.2 Evaluation of test results with matched conditions . 22 9.2.3 Measuring with mismatch. 22 9.2.4 Evaluation of

17、 test results . 22 9.3 Test report 23 10 Coupling attenuation 23 10.1 Procedure . 23 10.2 Expression of results 24 10.3 Test report 24 10.4 Balunless procedure . 25 Annex A (normative) Determination of the impedance of the inner circuit . 26 IEC 62153-4-7:2015 IEC 2015 3 Annex B (informative) Exampl

18、e of a self-made impedance matching adapter . 27 Annex C (informative) Measurements of the screening effectiveness of connectors and cable assemblies . 29 C.1 General . 29 C.2 Physical basics . 29 C.2.1 General coupling equation . 29 C.2.2 Coupling transfer function 31 C.3 Triaxial test set-up 33 C.

19、3.1 General . 33 C.3.2 Measurement of cable assemblies . 34 C.3.3 Measurement of connectors . 35 C.4 Conclusion 38 Annex D (informative) Influence of contact resistances 39 Bibliography 41 Figure 1 Definition of Z T9 Figure 2 Principle of the test set-up to measure transfer impedance and screening o

20、r coupling attenuation of connectors with tube in tube . 11 Figure 3 Principle of the test set-up to measure transfer impedance and screening attenuation of a cable assembly 14 Figure 4 Principle set-up for verification test 16 Figure 5 Preparation of balanced or multiconductor connectors . 18 Figur

21、e 6 Test set-up (principle) for transfer impedance measurement according to test method B of IEC 62153-4-3 19 Figure 7 Measuring the screening attenuation with tube in tube with impedance matching device 21 Figure 8 Measuring the coupling attenuation with tube in tube and balun . 24 Figure 9 Typical

22、 measurement of a connector of 0,04 m length with 1 m extension tube 25 Figure 10 Measuring the coupling attenuation with multiport VNA (balunless procedure is under consideration) . 25 Figure B.1 Attenuation and return loss of a 50 to 5 impedance matching adapter, log scale . 27 Figure B.2 Attenuat

23、ion and return loss of a 50 to 5 impedance matc hing adapter, lin scale 28 Figure C.1 Equivalent circuit of coupled transmission lines 30 Figure C.2 Summing function S 31 Figure C.3 Calculated coupling transfer function (l = 1 m; e r1= 2,3; e r2= 1; Z F = 0) 32 Figure C.4 Triaxial set-up for the mea

24、surement of the screening attenuation a Sand the transfer impedance Z T33 Figure C.5 Simulation of a cable assembly (logarithmic scale) . 35 Figure C.6 Simulation of a cable assembly (linear scale) . 35 Figure C.7 Triaxial set-up with extension tube for short cable assemblies 36 Figure C.8 Triaxial

25、set-up with extension tube for connectors . 36 Figure C.9 Simulation, logarithmic frequency scale 37 Figure C.10 Measurement, logarithmic frequency scale . 37 Figure C.11 Simulation, linear frequency scale. 37 4 IEC 62153-4-7:2015 IEC 2015 Figure C.12 Measurement, linear frequency scale 37 Figure C.

26、13 Simulation, logarithmic frequency scale 38 Figure C.14 simulation, linear frequency scale . 38 Figure D.1 Contact resistances of the test set-up . 39 Figure D.2 Equivalent circuit of the test set-up . 39 Table 1 IEC 62153, Metallic communication cable test methods Test procedures with triaxial te

27、st set-up 11 IEC 62153-4-7:2015 IEC 2015 5 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ METALLIC COMMUNICATION CABLE TEST METHODS Part 4-7: Electromagnetic compatibility (EMC) Test method for measuring of transfer impedance Z Tand screening attenuation a s or coupling attenuation a Cof connectors and

28、 assemblies up to and above 3 GHz Triaxial tube in tube method 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

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37、ts (including legal fees) and expenses arising out of the publication, 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 applic

38、ation of this publication. 9) Attention is drawn to the possibility 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 62153-4-7 has been prepared by IEC te

39、chnical committee 46: Cables, wires, waveguides, R.F. connectors, R.F. and microwave passive components and accessories. This second edition cancels and replaces the first edition published in 2006. This edition constitutes a technical revision. This edition includes the following significant techni

40、cal changes with respect to the previous edition: The document is revised and updated. The changes of the revised IEC 62153-4-3:2013, and IEC 62153-4-4:2015, are included. 6 IEC 62153-4-7:2015 IEC 2015 Measurements can be achieved now with mismatch at the generator site, impedance matching devices a

41、re not necessary. The text of this standard is based on the following documents: FDIS Report on voting 46/572/FDIS 46/585/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 accor

42、dance with the ISO/IEC Directives, Part 2. A list of all parts of the IEC 62153 series, 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

43、indicated on the IEC website under “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 co

44、lour inside logo on the cover 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 62153-4-7:2015 IEC 2015 7 INTRODUCTION The shielded screen

45、ing attenuation test set-up according to IEC 62153-4-3 and IEC 62153-4-4 have been extended to take into account the particularities of electrically short elements like connectors and cable assemblies. Due to the concentric outer tube of the triaxial set-up, measurements are independent of irregular

46、ities on the circumference and outer electromagnetic fields. With the use of an additional resonator tube (inner tube respectively tube in tube), a system is created where the screening effectiveness of an electrically short device is measured in realistic and controlled conditions. Also a lower cut

47、 off frequency for the transition between electrically short (transfer impedance Z T )and electrically long (screening attenuation a S ) can be achieved. A wide dynamic and frequency range can be applied to test even super screened connectors and assemblies with normal instrumentation from low frequ

48、encies up to the limit of defined transversal waves in the outer circuit at approximately 4 GHz. 8 IEC 62153-4-7:2015 IEC 2015 METALLIC COMMUNICATION CABLE TEST METHODS Part 4-7: Electromagnetic compatibility (EMC) Test method for measuring of transfer impedance Z Tand screening attenuation a s or c

49、oupling attenuation a Cof connectors and assemblies up to and above 3 GHz Triaxial tube in tube method 1 Scope This triaxial method is suitable to determine the surface transfer impedance and/or screening attenuation and coupling attenuation of mated screened connectors (including the connection between cable and connector) and cable assemblies. This method could also be extended to determine the transfer impedance, coupli