SIST EN 62333-2:2006

SLOVENSKI SIST EN 62333-2:2006

STANDARD
oct 2006
Protišumni list za digitalne naprave in opremo – 2. del: Merilne metode (IEC
62333-2:2006)
Noise suppression sheet for digital devices and equipment – Part 2: Measuring
methods (IEC 62333-2:2006)
ICS 33.160.01 Referenčna številka
SIST EN 62333-2:2006(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

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EUROPEAN STANDARD
EN 62333-2

NORME EUROPÉENNE
July 2006
EUROPÄISCHE NORM

ICS 29.100.10


English version


Noise suppression sheet for digital devices and equipment
Part 2: Measuring methods
(IEC 62333-2:2006)


Plaque réduisant le bruit des dispositifs  Rauschunterdrückungsschicht für
et appareils numériques digitale Geräte und Einrichtungen
Partie 2: Méthodes de mesure Teil 2: Messverfahren
(CEI 62333-2:2006) (IEC 62333-2:2006)




This European Standard was approved by CENELEC on 2006-06-01. 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 Central Secretariat or to any CENELEC member.

This European Standard exists in two official versions (English and 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
Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62333-2:2006 E

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EN 62333-2:2006 - 2 -
Foreword
The text of document 51/853/FDIS, future edition 1 of IEC 62333-2, prepared by IEC TC 51, Magnetic
components and ferrite materials, was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 62333-2 on 2006-06-01.
This Standard is to be used in conjunction with EN 62333-1.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2007-03-01
– latest date by which the national standards conflicting
(dow) 2009-06-01
with the EN have to be withdrawn
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 62333-2:2006 was approved by CENELEC as a European
Standard without any modification.
__________

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- 3 - EN 62333-2:2006

Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

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.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.


Publication Year Title EN/HD Year

1) 2)
IEC 62333-1 - Noise suppression sheet for digital devices EN 62333-1 2006
and equipment
Part 1: Terms and definitions


CISPR 16-1 Series Specification for radio disturbance and EN 55016-1 Series
immunity measuring apparatus and methods
Part 1: Radio disturbance and immunity
measuring apparatus


1) 2)
CISPR 22 - Information technology equipment - Radio EN 55022 2006
(mod) disturbance characteristics - Limits and
methods of measurement




1)
Undated reference.
2)
Valid edition at date of issue.

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INTERNATIONAL IEC


STANDARD 62333-2





First edition
2006-05


Noise suppression sheet for digital
devices and equipment –
Part 2:
Measuring methods

 IEC 2006  Copyright - all rights reserved
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 the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale S
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue

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– 2 – 62333-2  IEC:2006(E)
CONTENTS

FOREWORD.3

1 Scope.5
2 Normative references.5
3 General.5
4 Measuring methods
4.1 Intra-decoupling ratio: R .6
da
4.2 Inter-decoupling ratio: R .11
de
4.3 Transmission attenuation power ratio: R .15
tp
4.4 Radiation suppression ratio: R .18
rs

Figure 1 – Schematic diagram of a pair of antennas and NSS under test .6
Figure 2 – A pair of antennas and NSS under test .6
Figure 3 – Frequency response of coupling between a pair of antennas.7
Figure 4 – Recommended examples of small loop antennas for the measurement .8
Figure 5 – Cross sectional view of the measuring configuration .9
Figure 6 – Schematic diagram of the measuring configuration .10
Figure 7 – Schematic diagram of a pair of loop antennas and test sample .12
Figure 8 – Schematic diagram of a pair of antenna and test sample.12
Figure 9 – Schematic diagram of the measuring configuration .13
Figure 10 – Schematic diagram of the measuring method for transmission attenuation
power ratio R .15
tp
Figure 11 – Data examples of the measurement results .18
Figure 12 – Measurement system diagram of R .19
rs
Figure 13 – Schematic diagram of test fixture .19
Figure 14 – Size and structure of test fixture.20
Figure 15 – Test sample attachment on test fixture .22
Figure 16 – Test fixture setup on turntable.22

Table 1 – Merits and limitations of the recommended antennas .9
Table 2 – Dimensions of loop antennas .9
Table 3 – Dimensions of test sample .10
Table 4 – Dimensions of loop antennas .13
Table 5 – Dimensions of test fixture .16
Table 6 – Dimensions of test sample .16
Table 7 – Dimensions of test fixture .20
Table 8 – Dimensions of test sample .21

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62333-2  IEC:2006(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

NOISE SUPPRESSION SHEET
FOR DIGITAL DEVICES AND EQUIPMENT –

Part 2: Measuring methods


FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)“). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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.
International Standard IEC 62333-2 has been prepared IEC technical committee 51: Magnetic
components and ferrite materials.
This standard is to be used in conjunction with IEC 62333-1.
The text of this standard is based on the following documents:
FDIS Report on voting
51/853/FDIS 51/861/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.

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– 4 – 62333-2  IEC:2006(E)
IEC 62333 consists of the following parts, under the general title Noise suppression sheet for
digital devices and equipment:
Part 1: Definitions and general properties
Part 2: Measuring methods
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.

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62333-2  IEC:2006(E) – 5 –
NOISE SUPPRESSION SHEET
FOR DIGITAL DEVICES AND EQUIPMENT –

Part 2: Measuring methods



1 Scope
This part of IEC 62333 specifies the methods for measuring the electromagnetic
characteristics of a noise suppression sheet. Those methods are intended to provide useful
and repeatable measurements to characterize the performance of the noise suppression
sheets, so that manufacturers and their customers are able to obtain the same results.
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 amendment) applies.
IEC 62333-1, Noise suppression sheet for digital devices and equipment – Part 1: Definitions
and general properties
CISPR 16-1, Specification for radio disturbance and immunity measuring apparatus and
methods – Part 1: Radio disturbance and immunity measuring apparatus
CISPR 22, Information technology equipment – Radio disturbance characteristics – Limits and
methods of measurement
3 General
Electromagnetic interference between electronic devices, and emission of radiation from
electronic devices are caused, in part, by RF current generated by active devices which are
driven at high frequency. Printed-circuit board (PCB), devices mounted on the PCB, and all
other connected circuits or cables can act as antennas to radiate the RF noise. Levels of the
electromagnetic interference and the emission are proportional to the RF current, and are also
affected significantly by PCB design, radiation efficiency of the antennas, and noise coupling
coefficients between the devices and the antennas.
The noise suppression sheet (NSS) is used for decoupling of the noise path, suppressing RF
noise current, and reducing radiation. The noise suppression effect of the NSS can be
evaluated by four parameters. They are defined as intra-decoupling ratio (R ), inter-
da
decoupling ratio (R ), transmission attenuation power ratio (R ) and radiation suppression
de tp
ratio (R ).
rs
A pair of antennas is held close to each other for the measuring intra-decoupling ratio (R )
da
and inter-decoupling ratio (R ). One antenna acts as a noise source and another one as a
de
receiver. Both decoupling ratios are derived from comparison before and after the NSS is
installed nearby the antennas. These measuring procedures represent practical configurations
of the NSS. Practically, the NSS is installed near the noise source or the noise interfered part,
inside of the electronic equipments.

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– 6 – 62333-2  IEC:2006(E)
A micro-strip line (MSL) test fixture is used for the measuring transmission attenuation power
ratio (R ) as a transmission line that would be a noise path. The ratio is derived from
tp
comparison before and after the NSS installation. This measuring procedure represents
another practical configuration that the NSS is utilized for reducing the RF current along the
transmission line.
The MSL test fixture is also used for measuring radiation suppression ratio (R ) as the
rs
antenna. The ratio is derived from a comparison before and after the NSS installation. This
measuring procedure represents another practical configuration that the NSS is utilized for
reducing the radiation from the antenna.
4 Measuring methods
4.1 Intra-decoupling ratio: R
da
4.1.1 Principle
The following measuring method is applied for evaluating a reduction of coupling between
lines or circuit boards on one side of the NSS, from 100 MHz to 6 GHz.
A pair of loop antennas is employed. One is for noise source and the other one for receiver.
They are simulating a general electromagnetic interference situation that often exists inside
electronic equipment (see Figure 1).
The NSS is placed so that the centre of the antenna pair comes to the centre of the NSS. The
coupling between two antennas with the NSS is measured, as well as the coupling without the
NSS as a reference value. Consequently, intra-decoupling ratio R (dB) can be obtained.
da
RF magnetic field raised by one antenna is coupled with another one (see Figure 2a). By
setting the NSS, the antennas (see Figure 2b), a part of the magnetic flux is led to the NSS,
and the coupling is reduced by electromagnetic loss in the material.

Loop antennas
Network
NSS
analyzer
Magnetic flux
Coaxial cable
IEC  637/06

Figure 1 – Schematic diagram of a pair of antennas and NSS under test

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62333-2  IEC:2006(E) – 7 –

Magnetic flux
NSS
IEC  638/06 IEC  639/06
Figure 2a – Loop antennas
Figure 2b – NSS under test

Figure 2 – A pair of antennas and NSS under test
4.1.2 Apparatus
Figure 1 shows the schematic diagram of the measuring method of intra-decoupling ratio.
NOTE The test sample and the loop antennas are set at least 30 mm away from any other material except for the
coaxial cable, using low dielectric and low loss material such as the styrene foam and air gap.
Small loop antennas shall be used for the generation of the RF magnetic field and the
detection of the magnetic flux.
The S of the ideal loop antenna pair is proportional to the frequency. This means that S
21 21
increases 20 dB with the decade of frequency. The usable frequency range of the loop
antenna is defined by the deviation of S from the theoretical value. The deviation should be
21
less than ±3 dB as shown in Figure 3.

Theoretical
20 dB/decade
20 dB
+3 dB
20 dB
–3 dB
f 10f
f/10
Frequency
IEC
...