IEC TS 62153-4-1:2014
(Main)Metallic communication cable test methods - Part 4-1: Electromagnetic compatibility (EMC) - Introduction to electromagnetic screening measurements
Metallic communication cable test methods - Part 4-1: Electromagnetic compatibility (EMC) - Introduction to electromagnetic screening measurements
IEC TS 62153-4-1:2014(E) deals with screening measurements. Screening (or shielding) is one basic way of achieving electromagnetic compatibility (EMC). However, a confusingly large number of methods and concepts is available to test for the screening quality of cables and related components, and for defining their quality. This technical specification gives a brief introduction to basic concepts and terms trying to reveal the common features of apparently different test methods. It is intended to assist in correct interpretation of test data, and in the better understanding of screening (or shielding) and related specifications and standards. This technical specification cancels and replaces the second edition of the technical report IEC/TR 62153-4-1 published in 2010.
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IEC TS 62153-4-1 ®
Edition 1.0 2014-01
TECHNICAL
SPECIFICATION
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inside
Metallic communication cable test methods –
Part 4-1: Electromagnetic compatibility (EMC) – Introduction to electromagnetic
screening measurements
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IEC TS 62153-4-1 ®
Edition 1.0 2014-01
TECHNICAL
SPECIFICATION
colour
inside
Metallic communication cable test methods –
Part 4-1: Electromagnetic compatibility (EMC) – Introduction to electromagnetic
screening measurements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
XD
ICS 33.100 ISBN 978-2-8322-1311-7
– 2 – TS 62153-4-1 © IEC:2014(E)
CONTENTS
FOREWORD . 7
1 Scope . 9
2 Normative references . 9
3 Symbols interpretation . 10
4 Electromagnetic phenomena. 12
5 The intrinsic screening parameters of short cables . 14
5.1 General . 14
5.2 Surface transfer impedance, Z . 14
T
5.3 Capacitive coupling admittance, Y . 14
C
5.4 Injecting with arbitrary cross-sections . 16
5.5 Reciprocity and symmetry . 16
5.6 Arbitrary load conditions . 16
6 Long cables – coupled transmission lines . 16
7 Transfer impedance of a braided wire outer conductor or screen . 24
8 Test possibilities . 30
8.1 General . 30
8.2 Measuring the transfer impedance of coaxial cables . 30
8.3 Measuring the transfer impedance of cable assemblies . 31
8.4 Measuring the transfer impedance of connectors . 31
8.5 Calculated maximum screening level . 31
9 Comparison of the frequency response of different triaxial test set-ups to measure
the transfer impedance of cable screens . 36
9.1 General . 36
9.2 Physical basics . 36
9.2.1 Triaxial set-up . 36
9.2.2 Coupling equations . 38
9.3 Simulations . 40
9.3.1 General . 40
9.3.2 Simulation of the standard and simplified methods according
to EN 50289-1-6, IEC 61196-1 (method 1 and 2) and
IEC 62153-4-3 (method A) . 40
9.3.3 Simulation of the double short circuited methods . 46
9.4 Conclusion . 54
10 Background of the shielded screening attenuation test method (IEC 62153-4-4) . 54
10.1 General . 54
10.2 Objectives . 55
10.3 Theory of the triaxial measuring method . 55
10.4 Screening attenuation . 60
10.5 Normalised screening attenuation . 62
10.6 Measured results . 63
10.7 Comparison with absorbing clamp method . 65
10.8 Practical design of the test set-up . 66
10.9 Influence of mismatches . 67
10.9.1 Mismatch in the outer circuit . 67
10.9.2 Mismatch in the inner circuit . 69
TS 62153-4-1 © IEC:2014(E) – 3 –
11 Background of the shielded screening attenuation test method for measuring the
screening effectiveness of feed-throughs and electromagnetic gaskets
(IEC 62153-4-10) . 72
11.1 General . 72
11.2 Theoretical background of the test Fixtures and their equivalent circuit . 73
11.3 Pictures and measurement results . 76
11.3.1 Characteristic impedance uniformity . 76
11.3.2 Measurements of shielding effectiveness . 78
11.3.3 Calculation of transfer impedance . 80
11.4 Calculation of screening attenuation for feed-through when the transfer
impedance Z is known . 82
T
12 Background of the shielded screening attenuation test method for measuring the
screening effectiveness of RF connectors and assemblies (IEC 62153-4-7) . 83
12.1 Physical basics . 83
12.1.1 Surface transfer impedance Z . 83
T
12.1.2 Screening attenuation a . 84
S
12.1.3 Coupling attenuation a . 84
C
12.1.4 Coupling transfer function . 84
12.1.5 Relationship between length and screening measurements . 85
12.2 Tube in tube set-up (IEC 62153-4-7) . 86
12.2.1 General . 86
12.2.2 Procedure . 86
12.2.3 Measurements and simulations . 88
12.2.4 Influence of contact resistances . 89
Bibliography . 91
Figure 1 – Total electromagnetic field . 12
(E ,H )
t t
Figure 2 – Defining and measuring screening parameters – A triaxial set-up . 13
Figure 3 – Equivalent circuit for the testing of Z . 15
T
Figure 4 – Equivalent circuit for the testing of Y = j ωC . 15
c T
Figure 5 – Electrical quantities in a set-up that is matched at both ends . 16
Figure 6 – The summing function S{L·f} for near and far end coupling . 20
Figure 7 – Transfer impedance of a typical single braid screen . 20
Figure 8 – The effect of the summing function on the coupling transfer function of a
typical single braid screen cable . 21
Figure 9 – Calculated coupling transfer functions T and T for a single braid – Z = 0 . 21
n f F
Figure 10 – Calculated coupling transfer functions T and T for a single braid – Im(Z )
n f T
is positive and Z = +0,5 × Im(Z ) at high frequencies . 22
F T
Figure 11 – Calculated coupling transfer functions T and T for a single braid – Im(Z )
n f T
is negative and Z = –0,5 × Im(Z ) at high frequencies. 23
F T
Figure 12 – : the complete length dependent factor in the coupling function T . 24
L·S
Figure 13 – Transfer impedance of typical cables . 25
Figure 14 – Magnetic coupling in the braid – Complete flux. 26
Figure 15 – Magnetic coupling in the braid – Left-hand lay contribution . 26
Figure 16 – Magnetic coupling in the braid – Right-hand lay contribution . 26
Figure 17 – Complex plane, Z = Re Z + j Im Z , frequency f as parameter . 27
T T T
Figure 18 – Magnitude (amplitude), | Z (f) | . 27
T
– 4 – TS 62153-4-1 © IEC:2014(E)
Figure 19 – Typical Z (time) step response of an overbraided and underbraided single
T
braided outer conductor of a coaxial cable . 28
Figure 20 – Z equivalent circuits of a braided wire screen . 29
T
Figure 21 – Comparison of signal levels in a generic test setup . 32
Figure 22 – Triaxial set-up for the measurement of the transfer impedance Z . 36
T
Figure 23 – Equivalent circuit of the triaxial set-up . 37
Figure 24 – Simulation of the frequency response for g . 41
Figure 25 – Simulation of the frequency response for g . 41
Figure 26 – Simulation of the frequency response for g . 42
Figure 27 – Simulation of the frequen
...
IEC TS 62153-4-1 ®
Edition 1.1 2020-05
CONSOLIDATED VERSION
TECHNICAL
SPECIFICATION
colour
inside
Metallic communication cable test methods –
Part 4-1: Electromagnetic compatibility (EMC) – Introduction to electromagnetic
screening measurements
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary
(IEV) online.
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Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
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IEC publications issued between 2002 and 2015. Some
IEC Customer Service Centre - webstore.iec.ch/csc entries have been collected from earlier publications of IEC
If you wish to give us your feedback on this publication or TC 37, 77, 86 and CISPR.
need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
IEC TS 62153-4-1 ®
Edition 1.1 2020-05
CONSOLIDATED VERSION
TECHNICAL
SPECIFICATION
colour
inside
Metallic communication cable test methods –
Part 4-1: Electromagnetic compatibility (EMC) – Introduction to electromagnetic
screening measurements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.100.10 ISBN 978-2-8322-8341-7
IEC TS 62153-4-1 ®
Edition 1.1 2020-05
REDLINE VERSION
colour
inside
Metallic communication cable test methods –
Part 4-1: Electromagnetic compatibility (EMC) – Introduction to electromagnetic
screening measurements
– 2 – IEC TS 62153-4-1:2014+AMD1:2020 CSV
IEC 2020
CONTENTS
FOREWORD . 7
1 Scope . 9
2 Normative references . 9
3 Symbols interpretation . 10
4 Electromagnetic phenomena. 12
5 The intrinsic screening parameters of short cables . 14
5.1 General . 14
5.2 Surface transfer impedance, Z . 14
T
5.3 Capacitive coupling admittance, Y . 15
C
5.4 Injecting with arbitrary cross-sections . 17
5.5 Reciprocity and symmetry . 17
5.6 Arbitrary load conditions . 17
6 Long cables – coupled transmission lines . 17
7 Transfer impedance of a braided wire outer conductor or screen . 25
8 Test possibilities . 31
8.1 General . 31
8.2 Measuring the transfer impedance of coaxial cables . 31
8.3 Measuring the transfer impedance of cable assemblies . 32
8.4 Measuring the transfer impedance of connectors . 32
8.5 Calculated maximum screening level . 32
9 Comparison of the frequency response of different triaxial test set-ups to measure
the transfer impedance of cable screens . 37
9.1 General . 37
9.2 Physical basics . 37
9.2.1 Triaxial set-up . 37
9.2.2 Coupling equations . 39
9.3 Simulations . 41
9.3.1 General . 41
9.3.2 Simulation of the standard and simplified methods according
to EN 50289-1-6, IEC 61196-1 (method 1 and 2)
and IEC 62153-4-3 (method A) . 41
9.3.3 Simulation of the double short circuited methods . 47
9.4 Conclusion . 55
10 Background of the shielded screening attenuation test method (IEC 62153-4-4) . 55
10.1 General . 55
10.2 Objectives . 56
10.3 Theory of the triaxial measuring method . 56
10.4 Screening attenuation . 61
10.5 Normalised screening attenuation . 63
10.6 Measured results . 64
10.7 Comparison with absorbing clamp method . 66
10.8 Practical design of the test set-up . 67
10.9 Influence of mismatches . 68
10.9.1 Mismatch in the outer circuit . 68
10.9.2 Mismatch in the inner circuit . 70
IEC 2020
11 Background of the shielded screening attenuation test method for measuring
the screening effectiveness of feed-throughs and electromagnetic gaskets
(IEC 62153-4-10) . 73
11.1 General . 73
11.2 Theoretical background of the test Fixtures and their equivalent circuit . 74
11.3 Pictures and measurement results . 77
11.3.1 Characteristic impedance uniformity . 77
11.3.2 Measurements of shielding effectiveness . 79
11.3.3 Calculation of transfer impedance . 81
11.4 Calculation of screening attenuation for feed-through when the transfer
impedance Z is known . 83
T
12 Background of the shielded screening attenuation test method for measuring the
screening effectiveness of RF connectors and assemblies (IEC 62153-4-7) . 84
12.1 Physical basics . 84
12.1.1 Surface transfer impedance Z . 84
T
12.1.2 Screening attenuation a . 85
S
12.1.3 Coupling attenuation a . 85
C
12.1.4 Coupling transfer function . 85
12.1.5 Relationship between length and screening measurements . 86
12.2 Tube in tube set-up (IEC 62153-4-7) . 87
12.2.1 General . 87
12.2.2 Procedure . 87
12.2.3 Measurements and simulations . 89
12.2.4 Influence of contact resistances . 90
Annex A (normative) Mixed mode S-parameter . 92
A.1 General . 92
A.2 Definition of mixed mode S-parameters . 92
A.3 Mixed mode S-parameter nomenclature . 93
A.4 Termination . 95
A.5 Reference impedance of a VNA . 96
A.6 TP-connecting unit . 96
Annex B (informative) Example derivation of mixed mode parameters using the modal
decomposition technique . 98
Bibliography . 102
Figure 1 – Total electromagnetic field (E ,H ) . 13
t t
Figure 2 – Defining and measuring screening parameters – A triaxial set-up . 14
Figure 3 – Equivalent circuit for the testing of Z . 16
T
Figure 4 – Equivalent circuit for the testing of Y = j ωC . 16
c T
Figure 5 – Electrical quantities in a set-up that is matched at both ends . 16
Figure 6 – The summing function S{L·f} for near and far end coupling . 21
Figure 7 – Transfer impedance of a typical single braid screen . 21
Figure 8 – The effect of the summing function on the coupling transfer function of a
typical single braid screen cable . 22
Figure 9 – Calculated coupling transfer functions T and T for a single braid – Z = 0 . 22
n f F
Figure 10 – Calculated coupling transfer functions T and T for a single braid – Im(Z )
n f T
is positive and Z = +0,5 × Im(Z ) at high frequencies . 23
F T
– 4 – IEC TS 62153-4-1:2014+AMD1:2020 CSV
IEC 2020
Figure 11 – Calculated coupling transfer functions T and T for a single braid – Im(Z )
n f T
is negative and Z = –0,5 × Im(Z ) at high frequencies. 24
F T
Figure 12 – : the complete length dependent factor in the coupling function T . 25
L·S
Figure 13 – Transfer impedance of typical cables . 26
Figure 14 – Magnetic coupling in the braid – Complete flux. 27
Figure 15 – Magnetic coupling in the braid – Left-hand lay contribution . 27
Figure 16 – Magnetic coupling in the braid – Right-hand lay contribution . 27
Figure 17 – Complex plane, Z = Re Z + j Im Z , frequency f as parameter . 28
T T T
Figure 18 – Magnitude (amplitud
...
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