IEC 62333-3:2010

IEC 62333-3 ®
Edition 1.0 2010-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Noise suppression sheet for digital devices and equipment –
Part 3: Characterization of parameters of noise suppression sheet

Plaque réduisant le bruit des dispositifs et appareils numériques –
Partie 3: Caractérisation des paramètres des plaques réduisant le bruit

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IEC 62333-3 ®
Edition 1.0 2010-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Noise suppression sheet for digital devices and equipment –
Part 3: Characterization of parameters of noise suppression sheet

Plaque réduisant le bruit des dispositifs et appareils numériques –
Partie 3: Caractérisation des paramètres des plaques réduisant le bruit

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
L
CODE PRIX
ICS 29.100.10 ISBN 978-2-88910-674-5
– 2 – 62333-3 © IEC:2010
CONTENTS
FOREWORD.3
INTRODUCTION.5
1 Scope.6
2 Normative references .6
3 Terms and definitions .7
4 General .7
5 Parameters, descriptions and measuring methods.8
5.1 Material properties .8
5.1.1 Surface resistivity .8
5.1.2 Mechanical characteristics.8
5.1.3 Thermal conductivity.8
5.1.4 Environmental conditions.9
5.1.5 Statement for non-usage of the prohibited chemical materials .10
5.2 Structure .10
5.2.1 Thickness .10
5.2.2 Layer structure .10
Bibliography.11

Figure 1 – Framework of IEC 62333 series for noise suppression sheet.5
Figure 2 – Schematic diagram of thermal conductivity measuring apparatus .9
Figure 3 – Structure of NSS .10

Table 1 – Structural example .10

62333-3 © IEC:2010 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
NOISE SUPPRESSION SHEET FOR DIGITAL
DEVICES AND EQUIPMENT –
Part 3: Characterization of parameters of noise suppression sheet

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
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Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
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agreement between the two organizations.
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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 62333-3 has been prepared IEC technical committee 51: Magnetic
components and ferrite materials.
The text of this standard is based on the following documents:
FDIS Report on voting
51/970/FDIS 51/977/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.
A list of all parts of the IEC 62333 series, under the general title Magnetic components and
ferrite materials, can be found on the IEC website.

– 4 – 62333-3 © IEC:2010
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.
62333-3 © IEC:2010 – 5 –
INTRODUCTION
There are established standards for noise suppression sheet (NSS) as in IEC 62333-1 and in
IEC 62333-2.
Figure 1 shows the framework of IEC 62333 series for NSS.
Part 1 issues the general guidelines of IEC 62333 series. Part 2 establishes measurement
methods of four important suppression ratios for NSS.
This Part 3 specifies characterization of each parameter except suppression ratio of NSS,
which is determined in Part 2. Parameters prescribed in this part are divided into material
properties and structure.
IEC 62333-1
IEC 62333-2 and IEC 62333-3
Part 1: Definitions and Part 2: Measuring methods
general properties
Suppression ratio Suppression ratio (R , R , R and R )
da de tp rs
, R , R and R )
(R
da de tp rs
Part 3: Characterization of parameters of noise
suppression sheet
Others Material properties
Structure
IEC  2618/09
Figure 1 – Framework of IEC 62333 series for noise suppression sheet

– 6 – 62333-3 © IEC:2010
NOISE SUPPRESSION SHEET FOR DIGITAL
DEVICES AND EQUIPMENT –
Part 3: Characterization of parameters of noise suppression sheet

1 Scope
This part of IEC 62333 provides characterization of parameters for electromagnetic noise
suppression sheet (NSS) for digital devices and equipment used in a frequency range
between 30 MHz to 30 GHz. Guidance is given for uniform presentation of the properties of
noise suppression sheet, intended for use in manufacturers and users technical data. NSS
suppresses noise at its source, rather than absorbing noise at a distance. Therefore NSS is
distinguished from RF wave absorbers used in free space.
This standard addresses the following purposes of NSS manufacturers and users:
– it assists users in understanding the published technical data in catalogues;
– it guides users in selecting the most preferable NSS for each application;
– it establishes measurement benchmarking for manufacturers of performance in new
development of NSS; and
– it maintains high reliability of NSS and applied prod
...