1、 IEC 62153-4-4 Edition 2.0 2015-04 INTERNA TIONAL STA NDA RD Metallic communication cable test methods Part 4-4:Electromagnetic compatibility (EMC)Test method for measuring of the screening attenuation as up to and abov e 3 GHz,triaxial method IEC 62153-4-4:2015-04(en)colourinsideCopyright Internati
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11、right International Electrotechnical Commission IEC 62153-4-4 Edit ion 2.0 2015-04 INTER NA TIONAL STA NDA R D Metallic communication cable test methods Part 4-4:Electromagnetic compatibility(EMC)Test method for measuring of the screening attenuation as up to and abov e 3 GHz,triaxial method INTERNA
12、TIONAL ELECTROTECHNICAL COMMISSION ICS 33.100;33.120.10 ISBN 978-2-8322-2653-7 R egist er ed tr ademar k of t he Int er national Electr ot echnical Commission Warning!Make sure that you obtained this publication from an authorized distributor.colourinsideCopyright International Electrotechnical Comm
13、ission 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 Electrical 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 th
14、e surface transfer impedance ZT.7 4 Principles of the measuring method.10 5 Measurement.11 5.1 Equipment.11 5.2 Cable under test.11 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
15、A(normative)Determination of the impedance of the inner circuit.14 Annex B(informative)Example of a self-made impedance matching adapter.15 Annex C(informative)Reflection loss of a junction.17 Bibliography.19 Figure 1 Relationship of U2/U1 on a log(f)scale for a single braided cable.8 Figure 2 Relat
16、ionship of U2/U1 on a linear(f)scale and screening attenuation as on a linear(f)scale for a single braided cable.9 Figure 3 Measured screening attenuation as formed by the maximum envelope curve to the measured coupling voltage ratio U2/U1 of 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 Preparation of test sample(symmetrical and multi-conductor cables).12 Figure B.1 Attenuation and return loss of a