EN IEC 62153-4-7:2021

SLOVENSKI STANDARD
01-november-2021
Nadomešča:
SIST EN 62153-4-7:2016
SIST EN 62153-4-7:2016/A1:2018
SIST EN 62153-4-7:2016/AC:2016
Preskusne metode za kovinske kable in druge pasivne komponente - 4-7. del:
Elektromagnetna združljivost (EMC) - Preskusna metoda za meritve prehodne
impedance Z_T in zaslonskega slabljenja a_S ali
sklopnega slabljenja a_C konektorjev in sestavov - Metoda "cev v
cevi" (IEC 62153-4-7:2021)
Metallic cables and other passive components test methods - Part 4-7: Electromagnetic
compatibility (EMC) -Test method for measuring of transfer impedance Z_T
and screening attenuation a_S or coupling attenuation a_C of
connectors and assemblies - Triaxial tube in tube method (IEC 62153-4-7:2021)
Prüfverfahren für metallische Kommunikationskabel - Teil 4-7: Elektromagnetische
Verträglichkeit (EMV) - Prüfverfahren zur Messung von Kopplungswiderstand ZT und
von Schirm as- oder Kopplungsdämpfung ac von HF-Steckverbindern und
konfektionierten Kabeln bis zu und über 3 GHz - Rohr-im-Rohr-Verfahren (IEC 62153-4-
7:2021)
Méthodes d’essai des câbles métalliques et autres composants passifs - Partie 4-7:
Compatibilité électromagnétique (CEM) - Méthode d’essai pour mesurer l’impédance de
transfert, Z_T,et l’affaiblissement d’écrantage, a_S,ou
l’affaiblissement de couplage, a_C, des connecteurs et des cordons -
Méthode triaxiale en tubes concentriques (IEC 62153-4-7:2021)
Ta slovenski standard je istoveten z: EN IEC 62153-4-7:2021
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 62153-4-7

NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2021
ICS 33.100.10; 33.120.10 Supersedes EN 62153-4-7:2016 and all of its
amendments and corrigenda (if any)
English Version
Metallic cables and other passive components test methods -
Part 4-7: Electromagnetic compatibility (EMC) - Test method for
measuring of transfer impedance Z and screening attenuation
T
a or coupling attenuation a of connectors and assemblies -
S C
Triaxial tube in tube method
(IEC 62153-4-7:2021)
Méthodes d'essai des câbles métalliques et autres Prüfverfahren für metallische Kommunikationskabel - Teil 4-
composants passifs - Partie 4-7: Compatibilité 7: Elektromagnetische Verträglichkeit (EMV) - Prüfverfahren
électromagnétique (CEM) - Méthode d'essai pour mesurer zur Messung von Kopplungswiderstand Z und von Schirm
T
l'impédance de transfert, Z , et l'affaiblissement d'écrantage a - oder Kopplungsdämpfung a von HF-Steckverbindern
T S C
a , ou l'affaiblissement de couplage, a , des connecteurs et
S C und konfektionierten Kabeln bis zu und über 3 GHz - Rohr-
des cordons - Méthode triaxiale en tubes concentriques im-Rohr-Verfahren
(IEC 62153-4-7:2021) (IEC 62153-4-7:2021)
This European Standard was approved by CENELEC on 2021-08-27. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62153-4-7:2021 E

European foreword
The text of document 46/812/FDIS, future edition 3 of IEC 62153-4-7, prepared by IEC/TC 46 “Cables,
wires, waveguides, RF connectors, RF and microwave passive components and accessories” was
submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN IEC 62153-4-7:2021.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2022–05–27
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2024–08–27
document have to be withdrawn
This document supersedes EN 62153-4-7:2016 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a Standardization Request given to CENELEC by the
European Commission and the European Free Trade Association.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 62153-4-7:2021 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 62153-4-16 NOTE Harmonized as EN IEC 62153-4-16

To be published. Stage at time of publication: FprEN IEC 62153-4-16:2021.
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the
relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC/TS 62153-4-1 2014 Metallic communication cable test methods
- Part 4–1: Electromagnetic compatibility
(EMC) - Introduction to electromagnetic
screening measurements
IEC 62153-4-3 - Metallic communication cable test methods - -
- Part 4–3: Electromagnetic compatibility
(EMC) - Surface transfer impedance -
Triaxial method
IEC 62153-4-4 - Metallic communication cable test methods - -
- Part 4–4: Electromagnetic compatibility
(EMC) - Test method for measuring of the
screening attenuation as up to and above
3 GHz, triaxial method
IEC 62153-4-8 - Metallic cables and other passive - -
components - Test methods - Part 4–8:
Electromagnetic compatibility (EMC) -
Capacitive coupling admittance
IEC 62153-4-9 2018 Metallic communication cable test methods
- Part 4–9: Electromagnetic compatibility
(EMC) - Coupling attenuation of screened
balanced cables, triaxial method
IEC 62153-4-10  Metallic communication cable test methods
- Part 4–10: Electromagnetic compatibility
(EMC) - Transfer impedance and
screening attenuation of feed-throughs and
electromagnetic gaskets - Double coaxial
test method
IEC 62153-4-15 2015 Metallic communication cable test methods - -
- Part 4–15: Electromagnetic compatibility
(EMC) - Test method for measuring
transfer impedance and screening
attenuation - or coupling attenuation with
triaxial cell
IEC 62153-4-16 - Metallic cables and other passive - -
components test methods - Part 4–16:
Electromagnetic compatibility (EMC) -
Extension of the frequency range to higher
frequencies for transfer impedance and to
lower frequencies for screening attenuation
measurements using the triaxial set-up
- - Coaxial cables - Part 9–2: Sectional EN 50117-9-2 2019
specification for coaxial cables for
analogue and digital transmission - Indoor
droop cables for systems operating at
5 MHz – 3 000 MHz
IEC 62153-4-7 ®
Edition 3.0 2021-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Metallic cables and other passive components test methods –

Part 4-7: Electromagnetic compatibility (EMC) – Test method for measuring

of transfer impedance Z and screening attenuation a or coupling attenuation
T S
a of connectors and assemblies – Triaxial tube in tube method
C
Méthodes d’essai des câbles métalliques et autres composants passifs –

Partie 4-7: Compatibilité électromagnétique (CEM) – Méthode d’essai pour

mesurer l’impédance de transfert, Z ,et l’affaiblissement d’écrantage, a , ou
T S
l’affaiblissement de couplage, a , des connecteurs et des cordons – Méthode
C
triaxiale en tubes concentriques

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.100.10; 33.120.10 ISBN 978-2-8322-9988-3

– 2 – IEC 62153-4-7:2021 © IEC 2021
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references. 9
3 Terms and definitions . 10
4 Physical background . 12
5 Principle of the test methods . 12
5.1 General . 12
5.2 Transfer impedance . 13
5.3 Screening attenuation . 13
5.4 Coupling attenuation . 14
6 Test procedure . 15
6.1 General . 15
6.2 Tube in tube procedure . 15
6.3 Test equipment . 16
6.4 Calibration procedure . 16
6.5 Connection between extension tube and device under test . 17
6.6 Dynamic range respectively noise floor . 17
6.7 Impedance matching . 18
6.8 Influence of adapters . 18
7 Sample preparation . 19
7.1 Coaxial connector or device . 19
7.2 Balanced or multiconductor device . 19
7.3 Cable assembly . 21
8 Measurement of transfer impedance . 21
8.1 General . 21
8.2 Principle block diagram of transfer impedance . 21
8.3 Measuring procedure – Influence of connecting cables . 22
8.4 Measuring . 22
8.5 Evaluation of test results . 22
8.6 Test report . 23
9 Screening attenuation . 23
9.1 General . 23
9.2 Impedance matching . 23
9.2.1 General . 23
9.2.2 Evaluation of test results with matched conditions . 24
9.2.3 Measuring with mismatch . 25
9.2.4 Evaluation of test results . 25
9.3 Test report . 25
10 Coupling attenuation . 26
10.1 General . 26
10.2 Procedure for testing connectors . 26
10.3 Procedure for testing cable assemblies . 27
10.4 Evaluation of test results when using a balun . 28
10.5 Evaluation of test results when using a multiport VNA . 28

IEC 62153-4-7:2021 © IEC 2021 – 3 –
10.6 Test report . 29
Annex A (normative) Determination of the impedance of the inner circuit . 30
Annex B (informative) Example of a self-made impedance matching adapter . 31
Annex C (informative) Measurements of the screening effectiveness of connectors
and cable assemblies . 33
C.1 General . 33
C.2 Physical basics . 33
C.2.1 General coupling equation . 33
C.2.2 Coupling transfer function . 35
C.3 Triaxial test set-up . 37
C.3.1 General . 37
C.3.2 Measurement of cable assemblies . 38
C.3.3 Measurement of connectors . 39
C.4 Conclusion . 42
Annex D (informative) Influence of contact resistances . 43
Annex E (informative) Direct measurement of screening effectiveness of connectors . 45
E.1 Scope . 45
E.2 Test set-up. 45
E.3 Construction details of test set-up . 46
Annex F (normative) Mixed mode S-parameters . 48
F.1 General . 48
F.2 Definition of mixed mode S-parameters . 48
F.3 Reference impedance of a VNA . 51
Annex G (normative) Accessories for measuring coupling attenuation . 52
G.1 TP connecting unit . 52
G.2 Termination of the DUT . 52
G.3 Test adapter . 53
G.3.1 General . 53
G.3.2 Direct feeding with coaxial cables . 53
G.3.3 Balanced feeding cable . 54
G.3.4 Movable short circuit . 54
Annex H (informative) Low frequency screening attenuation . 56
Bibliography . 57

Figure 1 – Definition of Z . 10
T
Figure 2 – Principle of the test set-up to measure transfer impedance and screening or
coupling attenuation of connectors with tube in tube . 13
Figure 3 – Principle of the test set-up to measure transfer impedance and screening
attenuation of a cable assembly . 15
Figure 4 – Principle set-up for verification test . 18
Figure 5 – Preparation of balanced or multiconductor connectors . 21
Figure 6 – Test set-up (principle) for transfer impedance measurement according to
test of IEC 62153-4-3 with load resistor in inner circuit and without damping resistor in
outer circuit . 22
Figure 7 – Measuring the screening attenuation with tube in tube with impedance
matching device . 24
Figure 8 – Coupling attenuation, principle test set-up with 2-port VNA and balun . 26

– 4 – IEC 62153-4-7:2021 © IEC 2021
Figure 9 – Coupling attenuation, principle set-up with multiport VNA and
TP‑connecting unit . 27
Figure 10 – Coupling attenuation, principle test set-up with multiport VNA and
TP‑connecting unit for measuring complete cable assemblies . 27
Figure 11 – Coupling attenuation, principle test set-up with multiport VNA and
TP‑connecting unit for measuring halved cable assemblies . 28
Figure 12 – Typical measurement of a connector of 0,04 m length with 1 m extension tube . 29
Figure B.1 – Attenuation and return loss of a 50 Ω to 5 Ω impedance matching adapter,
log scale . 31
Figure B.2 – Attenuation and return loss of a 50 Ω to 5 Ω impedance matching adapter,
lin scale . 32
Figure C.1 – Equivalent circuit of coupled transmission lines . 34
Figure C.2 – Summing function S . 35
Figure C.3 – Calculated coupling transfer function (l = 1 m; e = 2,3; e = 1; Z = 0) . 36
r1 r2 F
Figure C.4 – Triaxial set-up for the measurement of the screening attenuation a and
S
the transfer impedance Z . 37
T
Figure C.5 – Simulation of a cable assembly (logarithmic scale) . 39
Figure C.6 – Simulation of a cable assembly (linear scale) . 39
Figure C.7 – Triaxial set-up with extension tube for short cable assemblies . 40
Figure C.8 – Triaxial set-up with extension tube for connectors . 40
Figure C.9 – Simulation, logarithmic frequency scale . 41
Figure C.10 – Measurement, logarithmic frequency scale . 41
Figure C.11 – Simulation, linear frequency scale . 41
Figure C.12 – Measurement, linear frequency scale . 41
Figure C.13 – Simulation, logarithmic frequency scale . 42
Figure C.14 – simulation, linear frequency scale . 42
Figure D.1 – Contact resistances of the test set-up . 43
Figure D.2 – Equivalent circuit of the test set-up . 43
Figure E.1 – Principle of the test set-up to measure transfer impedance and screening
attenuation of a connector . 45
Figure E.2 – Principle of the test set-up to measure transfer impedance and screening
attenuation of a cable assembly . 46
Figure E.3 – Example of sample preparing . 46
Figure E.4 – Screening tube with separate nut . 47
Figure E.5 – Screening fixed with associated nut . 47
Figure F.1 – Common two-port network . 48
Figure F.2 – Common four port network . 48
Figure F.3 – Physical and logical ports of a VNA . 49
Figure F.4 – Nomenclature of mixed mode S-parameters . 49
Figure F.5 – Measurement configuration, single ended response . 50
Figure F.6 – Measurement configuration, differential mode response . 51
Figure G.1 – Termination of the device under test, principle . 53
Figure G.2 – Balunless measurement of coupling attenuation of a balanced connector,
direct feeding, principle . 54
Figure G.3 – Balunless measurement of coupling attenuation of a cable assembly
using balanced feeding cable, principle . 54

IEC 62153-4-7:2021 © IEC 2021 – 5 –
Figure G.4 – Balunless measurement of coupling attenuation of a cable assembly
using adapters with implemented short circuit, principle . 55
Figure H.1 – Example for a screening attenuation test result of a cable assembly with a
test length of 2 meters . 56

Table 1 – IEC 62153, Metallic communication cable test methods – Test procedures
with triaxial test set-up . 12
Table G.1 – TP-connecting unit performance characteristics (100 kHz to 2 GHz) . 52

– 6 – IEC 62153-4-7:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
METALLIC CABLES AND OTHER PASSIVE
COMPONENTS TEST METHODS –
Part 4-7: Electromagnetic compatibility (EMC) –
Test method for measuring of transfer impedance Z and screening
T
attenuation a or coupling attenuation a of connectors and assemblies –
S C
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 co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
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in the subject dealt with may participate in this preparatory work. International, governmental and non-
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with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (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 application 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.
IEC 62153-4-7 has been prepared by IEC technical committee 46: Cables, wires, waveguides,
RF connectors, RF and microwave passive components and accessories. It is an International
Standard.
This third edition cancels and replaces the second edition published in 2015 and its
Amendment 1:2018. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
IEC 62153-4-7:2021 © IEC 2021 – 7 –
The document is revised and updated. It now includes IEC 62153-4-7:2015/COR1:2016 and
IEC 62153-4-7:2015/AMD1:2018. Furthermore, the changes of the revised
IEC 62153-4-9:2018 are included.
Measurements of the coupling attenuation can be achieved now by using a mixed mode
network analyser (virtual balun). The following new annexes have been added:
– Annex E contains informative information about the direct measurement of screening
effectiveness of connectors;
– Annex F gives normative information about mixed mode parameters;
– Annex G contains normative information about accessories for measuring coupling
attenuation;
– Annex H discusses the low frequency screening attenuation.
The text of this International Standard is based on the following documents:
FDIS Report on voting
46/812/FDIS 46/820/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement,
available at www.iec.ch/members_experts/refdocs. The main document types developed by
IEC are described in greater detail at www.iec.ch/standardsdev/publications.
A list of all parts of the IEC 62153 series, under the general title Metallic cables and other
passive components test methods can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour 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.
– 8 – IEC 62153-4-7:2021 © IEC 2021
INTRODUCTION
The shielded screening 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 irregularities 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 off frequency for the transition between
electrically short (transfer impedance Z ) and electrically long (screening attenuation a ) can
T S
be achieved.
A wide dynamic and frequency range can be applied to test even super screened connectors
and assemblies with normal instrumentation from low frequencies up to the limit of defined
transversal waves in the outer circuit at approximately 4 GHz.

IEC 62153-4-7:2021 © IEC 2021 – 9 –
METALLIC CABLES AND OTHER PASSIVE
COMPONENTS TEST METHODS –
Part 4-7: Electromagnetic compatibility (EMC) –
Test method for measuring of transfer impedance Z and screening
T
attenuation a or coupling attenuation a of connectors and assemblies –
S C
Triaxial tube in tube method
1 Scope
This part of IEC 62153 deals with the triaxial tube in tube method. 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, coupling or screening attenuation of balanced or multipin connectors and
multicore cable assemblies. For the measurement of transfer impedance and screening- or
coupling attenuation, only one test set-up is needed.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC TS 62153-4-1:2014, Metallic communication cable test methods – Part 4-1:
Electromagnetic compatibility (EMC) – Introduction to electromagnetic screening
measurements
IEC 62153-4-3, Metallic communication cable test methods – Part 4-3: Electromagnetic
Compatibility (EMC) − Surface transfer impedance − Triaxial method
IEC 62153-4-4, Metallic communication cable test methods – Part 4-4: Electromagnetic
compatibility (EMC) –Test method for measuring of the screening attenuation as up to and
above 3 GHz, triaxial method
IEC 62153-4-8, Metallic cables and other passive components – Test methods – Part 4-8:
Electromagnetic compatibility (EMC) – Capacitive coupling admittance
IEC 62153-4-9:2018, Metallic communication cable test methods – Part 4-9: Electromagnetic
compatibility (EMC) – Coupling attenuation of screened balanced cables, triaxial method
IEC 62153-4-10, Metallic communication cable test methods – Part 4-10: Electromagnetic
compatibility (EMC) – Transfer impedance and screening attenuation of feed-throughs and
electromagnetic gaskets - Double coaxial test method
IEC 62153-4-15:2015, Metallic communication cable test methods – Part 4-15:
Electromagnetic compatibility (EMC) – Test method for measuring transfer impedance and
screening attenuation – or coupling attenuation with triaxial cell

– 10 – IEC 62153-4-7:2021 © IEC 2021
IEC 62153-4-16, Metallic communication cable test methods – Part 4-16: Electromagnetic
compatibility (EMC) – Extension of the frequency range to higher frequencies for transfer
impedance and to lower frequencies for screening attenuation measurements using the
triaxial set-up
EN 50117-9-2:2019, Coaxial cables – Part 9-2: Sectional specification for coaxial cables for
analogue and digital transmission – Indoor droop cables for systems operating at 5 MHz –
3 000 MHz
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
surface transfer impedance
Z
T
induced to the inner
for an electrically short screen, quotient of the longitudinal voltage U
circuit by the current I fed into the outer circuit or vice versa
Note 1 to entry: The surface transfer impedance is expressed in ohms.
Note 2 to entry: The value Z of an electrically short screen is expressed in ohms [Ω] or decibels in relation to
T
1 Ω.
Note 3 to entry: See Figure 1.

Figure 1 – Definition of Z
T
U
Z =
(1)
T
I
Z
T
Z dB(Ω)=+×20 log (2)

T 10
1Ω

3.2
effective transfer impedance
Z
TE
maximum absolute value of the sum or difference of the capacitive coupling impedance Z
F
and the transfer impedance Z at every frequency:
T
IEC 62153-4-7:2021 © IEC 2021 – 11 –
Z max ZZ±
(3)
TE F T
3.3
screening attenuation
a
S
for electrically long devices, i.e. above the cut-off frequency, logarithmic ratio of the feeding
power P and the periodic maximum values of the coupled power P in the outer circuit
1 r,max
 
P
r,max
a =−×10 log Env (4)
 
S 10
 
P
 
Note 1 to entry: The screening attenuation of an electrically short device is defined as:
150Ω
a 20× log
(5)
S 10
Z
TE
where
150 Ω is the standardized impedance of the outer circuit.
3.4
coupling attenuation
a
C
for a screened balanced device, the sum of the unbalance attenuation a of the symmetric
U
pair and the screening attenuation a of the screen of the device under test
S
Note 1 to entry: For electrically long devices, i.e. above the cut-off frequency, the coupling attenuation a is
C
defined as the logarithmic ratio of the feeding power P and the periodic maximum values of the coupled power
P in the outer circuit.
r,max
3.5
coupling length
length of device under test
Note 1 to entry: The coupling length is electrically short, if
c
λ o
o
f<
or  (6)
>×10 ε
r1
l 10××l ε
r1
or electrically long, if
c
λ
o
o
or f≥ (7)
≤×π ε ± ε
r1 r2
l
π××l εε±
r1 r2
where
is the effective coupling length, in m;
l
is the free space wavelength, in m;
λ
ε is the resulting relative permittivity of the dielectric of the cable;
r1
ε
is the resulting relative permittivity of the dielectric of the secondary circuit;
r2
f is the frequency, in Hz;
c is the velocity of light in free space.
o
=
=
– 12 – IEC 62153-4-7:2021 © IEC 2021
3.6
device under test
DUT
device consisting of the mated connectors with their attached cables
4 Physical background
See respective clauses of IEC TS 62153-4-1, IEC 62153-4-3, IEC 62153-4-4, IEC 62153-4-9
and Annex C and Annex D.
5 Principle of the test methods
5.1 General
IEC 62153-4 (all parts) describes different test procedures to measure screening
effectiveness on communication cables, connectors and components with triaxial test set-up.
Table 1 gives an overview about IEC 62153-4 (all parts) test procedures with triaxial test
set-up.
Table 1 – IEC 62153, Metallic communication cable test methods –
Test procedures with triaxial test set-up
Metallic communication cable test methods – Electromagnetic compatibility (EMC)
IEC TS 62153-4-1 Introduction to electromagnetic (EMC) screening measurements
IEC 62153-4-3 Surface transfer impedance − Triaxial method
IEC 62153-4-4 Test method for measuring of the screening attenuation as up to and above 3 GHz,
triaxial method
IEC 62153-4-7 Test method for measuring the transfer impedance Z and the screening attenuation a or
T s
coupling attenuation a of RF-connectors and assemblies up to and above 3 GHz –
C
Triaxial tube in tube method
IEC 62153-4-9 Coupling attenuation of screened balanced cables, triaxial method
IEC 62153-4-10 Transfer impedance and screening attenuation of feed-throughs and electromagnetic
gaskets – Double coaxial test method
IEC 62153-4-15 Test method for measuring transfer impedance and screening attenuation − or coupling
attenuation with triaxial cell
IEC 62153-4-16 Extension of the frequency range to higher frequencies for transfer impedance and to
lower frequencies for screening attenuation measurements using the triaxial set-up

Usually, RF connectors have mechanical dimensions in the longitudinal axis in the range of
20 mm to maximum 50 mm. With the definition of electrical short elements, we get cut off or
corner frequencies for the transition between electrically short and long elements of about
1 GHz or higher for usual RF-connectors.
To measure the screening attenuation instead of transfer impedance also in the lower
frequency range, the tube in tube procedure was designed. The electrically length of the
RF-connector is extended by a RF-tightly closed metallic extension tube (tube in tube).
See Figure 2.
IEC 62153-4-7:2021 © IEC 2021 – 13 –

Figure 2 – Principle of the test set-up to measure transfer impedance
and screening or coupling attenuation of connectors with tube in tube
The tube in tube test set up is based on the triaxial system according to IEC 62153-4-3 and
IEC 62153-4-4 consisting of the DUT, a solid metallic tube and (optional) a RF-tight extension
tube. The matched device under test, DUT, which is fed by a generator, forms the disturbing
circuit which may also be designated as the inner or the primary circuit. The connecting
cables to the DUT are additionally screened by the tube in tube.
The disturbed circuit, which may also be designated as the outer or the second circuit, is
formed by the outer conductor of the device under test (and the extension tube), connected to
the connecting cable and a solid metallic tube, having the DUT under test in its axis.
5.2 Transfer impedance
The test determines the screening effectiveness of a shielded cable by applying a well-
defined current and voltage to the screen of the c
...