IEC 62153-4-4:2015

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

Part 4-4: Electromagnetic compatibility (EMC) – Test method for measuring of

the screening attenuation a up to and above 3 GHz, triaxial method

s
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.100; 33.120.10 ISBN 978-2-8322-2653-7

– 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 the surface transfer impedance Z . 7
T
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 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 U /U on a log (f) scale for a single braided cable . 8
2 1
Figure 2 – Relationship of U /U on a linear (f) scale and screening attenuation a on
2 1 s
a linear (f) scale for a single braided cable . 9
Figure 3 – Measured screening attenuation a formed by the maximum envelope
s
curve to the measured coupling voltage ratio U /U of a single braided cable . 9
2 1
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 an 50 Ω to 5 Ω impedance matching
adapter; logarithmic frequency scale . 15
Figure B.2 – Attenuation and return loss of an 50 Ω to 5 Ω impedance matching
adapter; linear frequency scale . 16
Figure C.1 – Equivalent circuit of generator with load . 17

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
METALLIC COMMUNICATION CABLE TEST METHODS –

Part 4-4: Electromagnetic compatibility (EMC) –
Test method for measuring of the screening attenuation a
s
up to and above 3 GHz, triaxial method

FOREWORD
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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. connectors, 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 adapters 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 standard 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 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 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 'colour inside' logo on the cover page of this publication indicates
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METALLIC COMMUNICATION CABLE TEST METHODS –

Part 4-4: Electromagnetic compatibility (EMC) –
Test method for measuring of the screening attenuation a
s
up to and above 3 GHz, triaxial method

1 Scope
This part of IEC 62153 describes a test method to determine the screening attenuation a of
s
metallic communication cable screens. Due to the concentric outer tube, measurements 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 approximately 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 (including 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
characteristic impedance of the primary circuit
...