Metallic communication cable test methods - Part 4-14: Electromagnetic compatibility (EMC) - Coupling attenuation of cable assemblies (Field conditions) absorbing clamp method

IEC 62153-4-14:2012(E) is applicable to the in-field test method that is used to determine the coupling attenuation for installed links and channels used in analogue and digital communication systems. This method is used to determine the attenuation of disturbing power to signal power in a cabling system, and vice versa. This determines the influence from cabling on the EMC performance of a system. This standard is part of the IEC 62153 series titled Metallic communication cable test methods.

General Information

Status
Published
Publication Date
14-May-2012
Current Stage
PPUB - Publication issued
Start Date
15-May-2012
Completion Date
15-May-2012
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IEC 62153-4-14
Edition 1.0 2012-05
INTERNATIONAL
STANDARD
colour
inside
Metallic communication cable test methods –
Part 4-14: Electromagnetic compatibility (EMC) – Coupling attenuation of cable
assemblies (field conditions) absorbing clamp method
IEC 62153-4-14:2012(E)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 62153-4-14
Edition 1.0 2012-05
INTERNATIONAL
STANDARD
colour
inside
Metallic communication cable test methods –
Part 4-14: Electromagnetic compatibility (EMC) – Coupling attenuation of cable
assemblies (field conditions) absorbing clamp method
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
ICS 33.040.20 ISBN 978-2-83220-086-5

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – 62153-4-14 © IEC:2012(E)
CONTENTS

FOREWORD ........................................................................................................................... 3

1 Scope ............................................................................................................................... 5

2 Normative references ....................................................................................................... 5

3 Terms and definitions ....................................................................................................... 5

4 Test method ..................................................................................................................... 6

4.1 Equipment ............................................................................................................... 6

4.1.1 General ....................................................................................................... 6

4.1.2 Balun requirements ..................................................................................... 6

4.1.3 Extension cable requirements ...................................................................... 7

4.2 Test sample ............................................................................................................ 8

4.2.1 General ....................................................................................................... 8

4.2.2 Tested length .............................................................................................. 8

4.2.3 Preparation of test sample ........................................................................... 8

4.3 Calibration procedure .............................................................................................. 9

4.4 Test set-up .............................................................................................................. 9

4.4.1 General ....................................................................................................... 9

4.4.2 Test set-up verification .............................................................................. 10

4.5 Measuring procedure ............................................................................................. 11

4.5.1 General ..................................................................................................... 11

4.5.2 Example of link measurement .................................................................... 11

5 Expression of test results ............................................................................................... 12

6 Test report...................................................................................................................... 12

6.1 General ................................................................................................................. 12

6.2 Evaluation of test results ....................................................................................... 13

Bibliography .......................................................................................................................... 16

Figure 1 – Measurement of surface wave at one end of a link or channel ................................ 6

Figure 2 – Termination of link or channel or applied extension cable ....................................... 9

Figure 3 – Example of a three-connector link configuration as defined in

ISO/IEC 11801 ...................................................................................................................... 11

Figure 4 – Wall outlet end measurement ............................................................................... 12

Figure 5 – Typical measurement of an unscreened channel – Coupling attenuation,

A is 43 dB ............................................................................................................................. 14

Figure 6 – Typical measurement of a screened balanced channel – Coupling

attenuation, A is 57 dB .......................................................................................................... 14

Figure 7 – Double wall outlet, right port (without connected screen) – Coupling

attenuation, A is 44,8 dB ....................................................................................................... 15

Figure 8 – Double wall outlet, left port (with connected screen) – Coupling attenuation,

A is 61,5 dB .......................................................................................................................... 15

Table 1 – Balun performance characteristics ........................................................................... 7

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62153-4-14 © IEC:2012(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
METALLIC COMMUNICATION CABLE TEST METHODS –
Part 4-14: Electromagnetic compatibility (EMC) –
Coupling attenuation of cable assemblies
(field conditions) absorbing clamp method
FOREWORD

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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.

International Standard IEC 62153-4-14 has been prepared by IEC technical committee 46:

Cables, wires, waveguides, R.F. connectors, R.F. and microwave passive components and

accessories.
The text of this standard is based on the following documents:
FDIS Report on voting
46/400/FDIS 46/415/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.

---------------------- Page: 5 ----------------------
– 4 – 62153-4-14 © IEC:2012(E)

A list of all the 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 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 standard may be issued at a later date.

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.
---------------------- Page: 6 ----------------------
62153-4-14 © IEC:2012(E) – 5 –
METALLIC COMMUNICATION CABLE TEST METHODS –
Part 4-14: Electromagnetic compatibility (EMC) –
Coupling attenuation of cable assemblies
(field conditions) absorbing clamp method
1 Scope

This part of IEC 62153 gives the in-field test method that is used to determine the coupling

attenuation for installed links and channels used in analogue and digital communication

systems.

This method is used to determine the attenuation of disturbing power to signal power in a

cabling system, and vice versa. This determines the influence from cabling on the EMC

performance of a system.

NOTE 1 The coupling attenuation of installed links and channels is dependent upon the performance of the

cabling components (balance and screening if applicable), workmanship (especially termination of screens) and

earthing and grounding. This procedure determines the overall effect of these parameters.

NOTE 2 This method cannot be used for verification of compliance with emission and immunity EMC standards

for the complete system, including active components.
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 60050 (all parts), International Electrotechnical Vocabulary (available at

IEC 61196-1, Coaxial communication cables – Part 1: Generic specification – General,

definitions and requirements

IEC 62153-4-5:2006, Metallic communication cable test methods – Part 4-5: Electromagnetic

Compatibility (EMC) – Coupling or screening attenuation – Absorbing clamp method
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60050-726 and

IEC 61196-1 apply.
The theoretical background is given in IEC/TR 62153-4-0 and IEC/TR 62153-4-1.
---------------------- Page: 7 ----------------------
– 6 – 62153-4-14 © IEC:2012(E)
4 Test method
4.1 Equipment
4.1.1 General

The field test equipment shall be able to measure the coupling attenuation according to the

principle defined in 5.1.1 of IEC 62153-4-5:2006 and Figure 1 below.
IEC 897/12
Key
1 Signal generator, output impedance Z
2 Balun (if applicable)
3 Screen of signal generator and balun if needed for high dynamic range
4 Reflector plate, minimum size 0,2 m × 0,2 m
5 Absorbing clamp
6 Absorber (ferrite tube) of the clamp, insertion loss > 10 dB
7 Current transformer of the clamp
8 Extension cable for connection to link under test. length 2 m
9 Measuring receiver cable (use the same in measurement and calibration)
10 Measuring receiver
11 Connecting hardware in measured end of link or channel
12 Link or channel under test
13 Load termination of far end of link or channel under test
Figure 1 – Measurement of surface wave at one end of a link or channel
4.1.2 Balun requirements

For the measurement of symmetrical links or channels, a means for generating symmetrical

signals shall be provided. If the generator is unbalanced, this may be performed by the use of

a balun or 180° power splitter.
The minimum requirements for this device are specified in Table 1.
___________

Instead of a signal generator and measuring receiver or network analyser, a spectrum analyser with tracking

generator can be used, which is available as a field test equipment.
There is no requirement for an absorber in the far end.
---------------------- Page: 8 ----------------------
62153-4-14 © IEC:2012(E) – 7 –

The attenuation of the balun shall be kept as low as possible because it will limit the dynamic

range of the coupling attenuation or screening attenuation measurements.
Table 1 – Balun performance characteristics
Parameter Value
Impedance, primary
50 Ω (unbalanced)
Impedance, secondary 100 Ω or 150 Ω (balanced)
Operational attenuation (including matching pads if
≤ 10 dB
used)
Return loss, bi-directional
≥ 6 dB
Power rating To accommodate the power of the generator and
amplifier (if applicable)
Output signal balance
≥ 50 dB from 30 MHz to 100 MHz
≥ 30 dB from 100 MHz to the highest measured
frequency

Primary impedance may differ if necessary to accommodate analyser outputs other than 50 Ω.

Balanced outputs of the test baluns shall be matched to the nominal impedance of the symmetrical patch

cord / cable pair. 100 Ω shal
...

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