IEC 62153-4-9:2008

IEC 62153-4-9
Edition 1.0 2008-03
INTERNATIONAL
STANDARD
Metallic communication cable test methods –
Part 4-9: Electromagnetic compatibility (EMC) – Coupling attenuation of
screened balanced cables, triaxial method

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IEC 62153-4-9
Edition 1.0 2008-03
INTERNATIONAL
STANDARD
Metallic communication cable test methods –
Part 4-9: Electromagnetic compatibility (EMC) – Coupling attenuation of
screened balanced cables, triaxial method

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
P
ICS 33.100; 33.120.20 ISBN 2-8318-9661-4

– 2 – 62153-4-9 © IEC:2008(E)
CONTENTS
FOREWORD.3

1 Scope.5

2 Normative references.5

3 Terms, definitions and symbols .5

4 Principle of the measuring method .7

5 Theoretical background .7

5.1 Unbalanced attenuation a .7
u
5.2 Screening attenuation a .8
s
5.3 Coupling attenuation a .9
c
6 Measurement.9
6.1 Equipment .9
6.2 Balun requirements.10
6.3 Sample preparation .11
6.4 Procedure.12
6.5 Measurement Precautions .12
7 Expression of results .12
8 Requirements .12
9 Plots of coupling attenuation versus frequency-typical results.13

Bibliography .15

Figure 1 – Principle test set-up.7
Figure 2 – Set-up to measure the coupling attenuation .10
Figure 3 – Termination of the cable under test.11
Figure 4 – Twinax 105 log .13
Figure 5 – Twinax 105 linear .13
Figure 6 – FTP log .14
Figure 7 – FTP linear .14

Table 1 – Balun performance characteristics (1 MHz to 1 GHz).11

62153-4-9 © IEC:2008(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
METALLIC COMMUNICATION CABLE TEST METHODS –

Part 4-9: Electromagnetic compatibility (EMC) –

Coupling attenuation of screened balanced cables, triaxial method

FOREWORD
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International Standard IEC 62153-4-9 has been prepared by IEC technical committee 46:
Cables, wires, waveguides, R.F. connectors, R.F. and microwave passive components and
accessories.
This standard cancels and replaces IEC/PAS 62338 published in 2002.
The text of this standard is based on the following documents:
CDV Report on voting
46/190/CDV 46/222/RVC
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.

– 4 – 62153-4-9 © IEC:2008(E)
A list of all parts of the IEC 62153 series can be found, under the general title Metallic

communication cable test methods, on the IEC website.

The committee has decided that the contents of this publication will remain unchanged until the

maintenance result date indicated on the IEC web site 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.

62153-4-9 © IEC:2008(E) – 5 –
METALLIC COMMUNICATION CABLE TEST METHODS –

Part 4-9: Electromagnetic compatibility (EMC) –

Coupling attenuation of screened balanced cables, triaxial method

1 Scope
This part of IEC 62153 applies to metallic communication cables. It specifies a test method for
of screened balanced cables. Due to the concentric
determining the coupling attenuation a
C
outer tube, measurements are independent of irregularities on the circumference and external
electromagnetic fields.
A wide dynamic and 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. However, the upper frequency is limited by the properties
of the baluns.
The procedure to measure the coupling attenuation a is based on the procedure to measure
C
the screening attenuation a according to IEC 62153-4-5.
S
2 Normative references
The following referenced documents are indispensable for the application 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 60050-726, International Electrotechnical Vocabulary (IEV) – Chapter 726: Transmission
lines and wave guides
IEC/TR 62153-4-1, Metallic communication cable test methods – Part 4-1: Electromagnetic
compatibility (EMC) – Introduction to electromagnetic (EMC) screening measurements
IEC 62153-4-5, Metallic communication cables test methods – Part 4-5: Electromagnetic
compatibility (EMC) – Coupling or screening attenuation – Absorbing clamp method
3 Terms, definitions and symbols

For the purposes of this document the terms and definitions given in IEC 60050-726,
IEC 62153-4-1 and IEC 62153-4-5, as well as the following symbols apply.
a is the screening attenuation which is comparable to the results of the absorbing clamp

s
method in dB;
is the coupling attenuation related to the radiating impedance of 150 Ω in dB;
a
c
a is the unbalanced attenuation;
u
a is the attenuation recorded as minimum envelope curve of the measured values in dB;
m,min
a is the additional attenuation of an eventually inserted adapter, if not otherwise eliminated
z
e.g. by the calibration, in dB;
C is the through capacitance of the outer conductor in F/m;
T
c is the vacuum velocity in m/s;
dx is the differential length operator of integraton;

– 6 – 62153-4-9 © IEC:2008(E)
λ is the vacuum wavelength in m;
ε is the relative dielectric permittivity of the cable under test;
r1
ε is the relative dielectric permittivity of the secondary circuit;
r2
ε is a normalised value of the relative dielectric permittivity of the environment of the cable;
r2,n
f is the frequency in Hz;
j is the imaginary operator (square root of minus one);

L is the transmission line parameter-inductance;

l is the effective coupling length in m;

φ is a phase factor in the ratio of the secondary to primary circuit end voltages (U /U );
1 2
P is the feeding power of the primary circuit in W;
P is the measured power received on the input impedance;
R of the receiver in the secondary circuit in W;
P is the radiated power in the environment of the cable, which is comparable to P + P
r 2,n 2,f
of the absorbing clamp method in W;
P is the periodic maximum values of the common mode radiated power in W;
r,max
P is the radiated power in the normalised environment of the cable under test,
s
( Z = 150 Ω and |Δv / v | = 10
...