IEC-TR-62153-4-1-2007.pdf
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1、 IEC/TR 62153-4-1 Edition 1.0 2007-11 TECHNICAL REPORT Metallic communication cable test methods Part 4-1: Electromagnetic compatibility (EMC) Introduction to electromagnetic (EMC) screening measurements IEC/TR 62153-4-1:2007(E) Copyright International Electrotechnical Commission Provided by IHS und
2、er license with IECLicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 12/17/2007 19:34:49 MSTNo reproduction or networking permitted without license from IHS -,-,- THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2007 IEC, Geneva, Switzerland All rights reserved. Unless otherwise sp
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10、HS under license with IECLicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 12/17/2007 19:34:49 MSTNo reproduction or networking permitted without license from IHS -,-,- IEC/TR 62153-4-1 Edition 1.0 2007-11 TECHNICAL REPORT Metallic communication cable test methods Part 4-1: Electrom
11、agnetic compatibility (EMC) Introduction to electromagnetic (EMC) screening measurements INTERNATIONAL ELECTROTECHNICAL COMMISSION XA ICS 33.100; 33.120.10 PRICE CODE ISBN 2-8318-9364-X Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1
12、111111001, User=Japan, IHS Not for Resale, 12/17/2007 19:34:49 MSTNo reproduction or networking permitted without license from IHS -,-,- 2 TR 62153-4-1 IEC:2007(E) CONTENTS FOREWORD.5 INTRODUCTION.7 1 Scope.8 2 Normative references8 3 List of symbols9 4 Electromagnetic phenomena.10 5 Intrinsic scree
13、ning parameters of short cables.12 5.1 Surface transfer impedance, ZT.12 5.2 Capacitive coupling admittance, Yc12 5.3 Injecting with arbitrary cross-sections.14 5.4 Reciprocity and symmetry14 5.5 Arbitrary load conditions 14 6 Long cables Coupled transmission lines.14 7 Transfer impedance of a braid
14、ed-wire outer conductor or screen.20 8 Test possibilities.26 8.1 Measuring the transfer impedance of coaxial cables.26 8.2 Measuring the transfer impedance of cable assemblies27 8.3 Measuring the transfer impedance of connectors .27 8.4 Calculated maximum screening level .27 9 Comparison of frequenc
15、y response of different triaxial test set-ups to measure transfer impedance of cable screens.32 9.1 Introductory remark .32 9.2 Physical basics32 9.3 Simulations35 9.4 Conclusion 49 Bibliography50 Additional reading .51 Figure 1 Incident (i), scattered (s) and resulting total electromagnetic fields
16、(Et, Ht) with induced surface current- and charge- densities J (A/m) and (C/m2) .11 Figure 2 Defining and measuring screening parameters Triaxial set-up 11 Figure 3a Equivalent circuit for the definition and possible testing of Z 13 Figure 3b Equivalent circuit for the definition and possible testin
17、g of Yc = j CT13 Figure 3c Definition of electrical quantities in a set-up that is matched at all ends .13 Figure 3 Defining and measuring screen parameters Equivalent circuits.13 Figure 4 Summing function flS for near (n) and far (f) end coupling .17 Figure 5a Transfer impedance of a typical single
18、 braid screen 18 Figure 5b Coupling transfer function for the same cable with negligible ZF(ZF Z2 (audio circuits). Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 12/17/2007 19:34:49 MSTNo r
19、eproduction or networking permitted without license from IHS -,-,- TR 62153-4-1 IEC:2007(E) 13 V E1 + Injection cylinder Shield Center conductor (1) l Sn above near end cut-off, yielding a directive effect. Key c )(fl cut-off point Figure 4 Summing function flS for near (n) and far (f) end coupling
20、Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 12/17/2007 19:34:49 MSTNo reproduction or networking permitted without license from IHS -,-,- 18 TR 62153-4-1 IEC:2007(E) log ZT log f f1 20 dB
21、/dec. IEC 2158/07 ()/mm20MHz 10 1T =fZ Figure 5a Transfer impedance of a typical single braid screen ZT Env (Tf) log ZT log f fr fcnfcf Tn Tf l 2 1 Z12 Env (Tn) IEC 2159/07 Figure 5b Coupling transfer function for the same cable with negligible ZF(ZF fc. EXAMPLE: 1 r1 = (set-up), 22 r2 .= (cable), M
22、Hz 200 MHz, 40 m 1 CfCn =ffl Figure 5 The effect of the summing function Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 12/17/2007 19:34:49 MSTNo reproduction or networking permitted without
23、 license from IHS -,-,- TR 62153-4-1 IEC:2007(E) 19 1105 1106 1107 1108 1109 11010 -80 -60 -40 TnztdBk TfztdBk fk T dB Tf Tn f Hz IEC 2160/07 Figure 6a Calculated coupling transfer functions Tn and Tf for a single braided when ZF = 0 In calculations the used parameters are: ZT (d.c.) =15 m/m and ZT
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