IEC 62333-2:2006
(Main)Noise suppression sheet for digital devices and equipment - Part 2: Measuring methods
Noise suppression sheet for digital devices and equipment - Part 2: Measuring methods
IEC 62333-2:2006 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.
This publication is to be read in conjunction with IEC 62333-1:2006.
Plaque réduisant le bruit des dispositifs et appareils numériques - Partie 2: Méthodes de mesure
La CEI 62333-2:2006 spécifie les méthodes de mesure des caractéristiques électromagnétiques d'une plaque réduisant le bruit. Ces méthodes sont destinées à fournir des mesures utiles et reproductibles pour caractériser les performances des plaques réduisant le bruit, de sorte que les fabricants et leurs clients puissent obtenir les mêmes résultats.
Cette publication doit être lue conjointement avec la CEI 62333-1:2006.
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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
Reference number
Publication numbering
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60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1.
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edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the base publication, the
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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
– 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
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.
– 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.
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.
– 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
...
IEC 62333-2 ®
Edition 1.0 2006-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Noise suppression sheet for digital devices and equipment –
Part 2: Measuring methods
Plaque réduisant le bruit des dispositifs et appareils numériques –
Partie 2: Méthodes de mesure
All rights reserved. Unless otherwise specified, 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 either IEC or
IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
please contact the address below or your local IEC member National Committee for further information.
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et les microfilms, sans l'accord écrit de la CEI ou du Comité national de la CEI du pays du demandeur.
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publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.
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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
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The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
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IEC 62333-2 ®
Edition 1.0 2006-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Noise suppression sheet for digital devices and equipment –
Part 2: Measuring methods
Plaque réduisant le bruit des dispositifs et appareils numériques –
Partie 2: Méthodes de mesure
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX S
ICS 29.100.10 ISBN 978-2-88912-593-7
– 2 – 62333-2 IEC:2006
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 General . 5
4 Measuring methods . 6
4.1 Intra-decoupling ratio: R . 6
da
4.2 Inter-decoupling ratio: R . 11
de
4.3 Transmission attenuation power ratio: R . 14
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 . 7
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 . 17
Figure 12 – Measurement system diagram of R . 18
rs
Figure 13 – Schematic diagram of test fixture . 18
Figure 14 – Size and structure of test fixture . 19
Figure 15 – Test sample attachment on test fixture . 21
Figure 16 – Test fixture set-up on turntable . 21
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 . 15
Table 6 – Dimensions of test sample . 16
Table 7 – Dimensions of test fixture . 19
Table 8 – Dimensions of test sample . 20
62333-2 IEC:2006 – 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 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 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.
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.
This bilingual version (2011-07) replaces the English version.
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.
– 4 – 62333-2 IEC:2006
The French version of this standard has not been voted upon.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
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 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.
62333-2 IEC:2006 – 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 d
...
IEC 62333-2 ®
Edition 1.1 2015-08
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Noise suppression sheet for digital devices and equipment –
Part 2: Measuring methods
Plaque réduisant le bruit des dispositifs et appareils numériques –
Partie 2: Méthodes de mesure
All rights reserved. Unless otherwise specified, 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
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copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
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et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
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3, rue de Varembé Fax: +41 22 919 03 00
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Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
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Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.
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IEC 62333-2 ®
Edition 1.1 2015-08
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Noise suppression sheet for digital devices and equipment –
Part 2: Measuring methods
Plaque réduisant le bruit des dispositifs et appareils numériques –
Partie 2: Méthodes de mesure
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.100.10 ISBN 978-2-8322-2836-4
IEC 62333-2 ®
Edition 1.1 2015-08
CONSOLIDATED VERSION
REDLINE VERSION
VERSION REDLINE
colour
inside
Noise suppression sheet for digital devices and equipment –
Part 2: Measuring methods
Plaque réduisant le bruit des dispositifs et appareils numériques –
Partie 2: Méthodes de mesure
– 2 – IEC 62333-2:2006+AMD1:2015 CSV
© IEC 2015
CONTENTS
FO R EW O RD . 4
1 Sc op e . . 6
2 Normative references . 6
3 General . 6
4 Measuring methods . 7
4.1 Intra-decoupling ratio: R . 7
da
4.2 Inter-decoupling ratio: R . 12
de
4.3 Transmission attenuation power ratio: R . 15
tp
4.4 Radiation suppression ratio: R . 19
rs
4.5 Line-decoupling ratio: R . 23
dl
Figure 1 – Schematic diagram of a pair of antennas and NSS under test . 7
Figure 2 – A pair of antennas and NSS under test . 8
Figure 3 – Frequency response of coupling between a pair of antennas . 8
Figure 4 – Recommended examples of small loop antennas for the measurement . 9
Figure 5 – Cross-sectional view of the measuring configuration . 10
Figure 6 – Schematic diagram of the measuring configuration . 11
Figure 7 – Schematic diagram of a pair of loop antennas and test sample . 13
Figure 8 – Schematic diagram of a pair of antenna and test sample . 13
Figure 9 – Schematic diagram of the measuring configuration . 14
Figure 10 – Schematic diagram of the measuring method for transmission attenuation
power ratio R . 16
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 set-up on turntable . 22
Figure 17 – Noise path . 24
Figure 18 – A test fixture for line decoupling measurement . 25
Figure 19 – Schematic diagram of MSL and loop antenna set-up . 25
Figure 20 – NSS, loop antenna and magnetic flux configuration . 26
Table 1 – Merits and limitations of the recommended antennas . 10
Table 2 – Dimensions of loop antennas . 10
Table 3 – Dimensions of test sample . 11
Table 4 – Dimensions of loop antennas . 14
Table 5 – Dimensions of test fixture . 16
Table 6 – Dimensions of test sample . 17
Table 7 – Dimensions of test fixture . 20
Table 8 – Dimensions of test sample . 21
Table 9 – Noise suppression effect classified as noise path and NSS position . 24
IEC 2015
Table 10 – Dimensions of the MSL . 26
Table 11 – Dimensions of loop antenna . 26
Table 12 – Dimensions of the test sample . 27
– 4 – IEC 62333-2:2006+AMD1:2015 CSV
IEC 2015
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
NOISE SUPPRESSION SHEET
FOR DIGITAL DEVICES AND EQUIPMENT –
Part 2: Measuring methods
FOREWORD
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