IEC 62333-3:2010

Noise suppression sheet for digital devices and equipment - Part 3: Characterization of parameters of noise suppression sheet

IEC 62333-3:2010 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 products.
The numerical values given in this standard are typical values of parameters (properties) of the related NSS. The purpose of NSS testing is the benchmarking of materials. Predictions of specific device performance values are not always easy or even possible. Every detailed material and NSS specification should be agreed between the user and the manufacturer.

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

La CEI 62333-3:2010 présente la caractérisation des paramètres pour les plaques réduisant le bruit électromagnétique des dispositifs et appareils numériques utilisés dans une gamme de fréquences allant de 30 MHz à 30 GHz. Elle indique comment présenter uniformément les propriétés des plaques réduisant le bruit, dans le cadre des données techniques pour les fabricants et les utilisateurs. Les plaques réduisant le bruit réduisent le bruit à sa source, plutôt que de l'absorber à une certaine distance. Ainsi, les plaques réduisant le bruit se distinguent des absorbeurs d'ondes RF utilisés dans l'espace libre. La présente norme aborde les besoins suivants des fabricants et des utilisateurs de plaques réduisant le bruit:
- aider les utilisateurs à comprendre les données techniques publiées dans les catalogues;
- guider les utilisateurs dans leur choix de plaques réduisant le bruit pour chaque application;
- établir des mesures de référence pour les fabricants qui développent de nouvelles plaques réduisant le bruit; et
- maintenir une fiabilité élevée des plaques réduisant le bruit et des produits appliqués.
Les valeurs numériques données dans la présente norme sont des valeurs typiques de paramètres (propriétés) des plaques réduisant le bruit. Les essais sur les plaques réduisant le bruit ont pour objectif d'établir des références pour les matériaux. Il n'est pas toujours facile, voire possible, de prédire les valeurs des performances spécifiques de certains dispositifs. Il convient que chaque spécification particulière des plaques réduisant le bruit et des matériaux fasse l'objet d'un accord entre l'utilisateur et le fabricant.

General Information

• Status: Published
• Publication Date: 13-Jan-2010
• ICS: 29.100.10 - Magnetic components
• Technical Committee: TC 51 - Magnetic components, ferrite and magnetic powder materials
• Drafting Committee: WG 10 - TC 51/WG 10
• Current Stage: PPUB - Publication issued
• Start Date: 14-Jan-2010
• Completion Date: 31-Jan-2010

Overview

IEC 62333-3:2010 is an international standard developed by the International Electrotechnical Commission (IEC) that focuses on the characterization of parameters for electromagnetic noise suppression sheets (NSS) used in digital devices and equipment. This standard applies to NSS operating within a wide frequency range from 30 MHz to 30 GHz. It complements the IEC 62333 series by providing detailed guidance for manufacturers and users on the technical properties and performance benchmark testing of noise suppression sheets.

The key objective of IEC 62333-3:2010 is to support consistent and reliable measurement and presentation of NSS properties. It ensures that noise suppression sheets effectively reduce electromagnetic noise at the source, distinguishing these materials from RF wave absorbers designed for free-space noise reduction.

Key Topics

• Scope and Purpose
  IEC 62333-3 outlines parameters for characterizing noise suppression sheets used in digital devices, assisting users in understanding technical data and guiding manufacturers in developing high-quality NSS products. It supports uniform benchmarking for material properties and physical structure.

• Material Properties
  Important parameters include:

  • Surface resistivity measured in ohms per square, indicating electrical resistance on the NSS surface, determined according to IEC 60093.
  • Mechanical characteristics such as density, Young’s modulus, and hardness, which influence durability and mechanical integrity. Density is measured per ISO 1183-1 standards.
  • Thermal properties including thermal conductivity and thermal expansion coefficients, critical for performance under varying temperature conditions.
  • Environmental conditions encompassing operating temperature range, storage temperature, and flammability ratings to ensure reliability in diverse application environments.

• Structural Parameters

  • Thickness of the noise suppression sheet, affecting noise attenuation and physical integration.
  • Layer structure detailing the composition and arrangement of layers within the NSS, which impacts electromagnetic characteristics.

• Measurement Methods
  The standard specifies methods to uniformly measure each parameter, providing clear instructions for material testing and data reporting. These methodologies foster comparability and reliability across different NSS manufacturers and users.

• Limitations
  Numerical values offered are typical reference values used for benchmarking rather than definitive performance guarantees. Specific device performance predictions should be jointly agreed upon between the user and manufacturer.

Applications

IEC 62333-3:2010 is essential for:

• Manufacturers of noise suppression sheets developing new NSS materials or improving existing designs. The standard provides benchmark criteria enabling consistent characterization and quality control.
• Design engineers and end-users who need to select optimal NSS materials for electromagnetic compatibility (EMC) in digital devices, ensuring reliable noise suppression without compromising device operation.
• Quality assurance teams requiring standardized measurement protocols for verifying NSS properties before installation or integration.
• Product developers in electronics and communication equipment sectors aiming to maintain high performance and reliability by incorporating tested and standardized noise suppression solutions.

Typical industries benefiting from this standard include telecommunications, consumer electronics, automotive electronics, and industrial digital systems requiring effective EMC mitigation.

Related Standards

IEC 62333-3:2010 works in conjunction with other parts of the IEC 62333 series:

• IEC 62333-1 - Provides general guidelines, definitions, and overall framework for noise suppression sheets.
• IEC 62333-2 - Establishes the measurement methods for key suppression ratios in noise suppression sheets, crucial for assessing NSS effectiveness against electromagnetic interference.

Additionally, referenced international standards for testing and measurement include:

• IEC 60068 series for environmental testing
• IEC 60093 for surface resistivity measurements
• ISO 527-1 for tensile properties of plastics
• ISO 1183-1 for density measurement
• ISO 22007 series for thermal conductivity and diffusivity

Together, these standards create a comprehensive foundation for developing, testing, and applying noise suppression sheets in digital devices ensuring electromagnetic noise control in a wide range of applications.

---

Keywords: IEC 62333-3, noise suppression sheet, electromagnetic noise suppression, digital devices, surface resistivity, thermal conductivity, mechanical properties, EMC standards, electromagnetic compatibility, noise suppression materials, IEC standards, frequency range 30 MHz to 30 GHz, noise attenuation, quality benchmarking, digital equipment noise control.

Standards Content (Sample)

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
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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 products.
The numerical values given in this standard are typical values of parameters (properties) of
the related NSS. The purpose of NSS testing is the benchmarking of materials. Predictions of
specific device performance values are not always easy or even possible.
Every detailed material and NSS specification should be agreed between the user and the
manufacturer.
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 60068-1:1988, Environmental testing – Part 1: General and guidance
IEC 60068-2-1, Environmental testing – Part 2-1: Tests – Test A: Cold
IEC 60068-2-2, Environmental testing – Part 2-2: Tests – Test B: Dry heat
IEC 60093, Methods of test for volume resistivity and surface resistivity of solid electrical
insulating materials
ISO 527-1, Plastics – Determination of tensile properties – Part 1: General principles
ISO 1183-1:2004, Plastics – Methods for determining the density non-cellular plastics – Part 1:
immersion method, liquid pyknometer method and titration method
ISO 3611, Micrometer callipers for external measurement

62333-3 © IEC:2010 – 7 –
ISO 22007-1, Plastics – Determination of thermal conductivity and thermal diffusivity – Part 1:
General principles
ISO 22007-2, Plastics – Determination of thermal conductivity and thermal diffusivity – Part 2:
Transient plane heat source (Hot Disc) method
ISO 22007-3, Plastics – Determination of thermal conductivity and thermal diffusivity – Part 3:
Temperature wave analysis method
ISO 22007-4, Plastics – Determination of thermal conductivity and thermal diffusivity – Part 4:
Laser flash method
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
density
ρ
3 3
ratio of the mass of a sample to its volume, expressed in kg/m or g/cm
3.2
specific gravity
ratio of material density (mass per unit volume) at 23 °C to the density of gas-free distilled
water at 23 °C
3.3
tensile strength
σ (Young’s modulus, Et)
M
maximum tensile stress sustained by the test specimen during a tensile test. It is expressed in
MPa
[ISO 527-1:1993, definition 4.3.3]
4 General
In selecting the optimum NSS, apart from the noise suppression ratios specified in Part 2,
material properties and structure are important factors.
Part 3 hereby, specifies measurement methods and data presentation methods of each
parameter except suppression ratio of NSS.
Part 2 gives guidance on suppression characteristics and this part gives guidance on the
characteristics of NSS with regards to material properties and structure.
The material properties in this standard consist of
– surface resistivity;
– mechanical characteristics (density, Young’s modulus and/or hardness);
– thermal characteristics (thermal conductivity, thermal expansion coefficient);
– environmental conditions (operating and/or storage temperature, flammability).
These parameters are required for indicating the installation availability and reliability after
long time usage.
The structures in this standard consist of
– thickness;
– 8 – 62333-3 © IEC:2010
– layer structure.
These parameters are closely related to the four specific noise suppression effects prescribed
in Part 2.
NOTE 1 The adhesive will have a direct influence on material properties. The definitions in this part are for NSS
without adhesive. Manufacturers and users should make specific agreement concerning properties with adhesive.
NOTE 2 Permeability is not a defined NSS material characteristic or structure. Permeability is considered by the
manufacturer in the design of the material, to achieve the target suppression properties in Part 2.
NOTE 3 Manufacturers often recommend frequency ranges in their datasheets based on typical applications and
operating conditions. Therefore, recommended frequency range is not included in material properties of this
standard.
5 Parameters, descriptions and measuring methods
5.1 Material properties
5.1.1 Surface resistivity
Surface resistivity shall be determined, and the results reported, as specified in
IEC 60093:1980.
Surface resistivity is the quotient of a d.c. electric field strength, and the linear current density
in a surface layer of NSS. In practice it is taken as the surface resistance reduced to a square
area. The size of the square is immaterial.
NOTE The SI unit of surface resistivity is the ohm (Ω). In practice, this is sometimes referred to as “ohms per
square”.
5.1.2 Mechanical characteristics
5.1.2.1 Density
Density shall be determined, and the results reported, by method A specified in ISO 1183-1.
5.1.2.2 Specific gravity
3 3
Specific gravity can be converted to density (kg/cm or g/cm ) by multiplying specific gravity
–4
by 9,975x10 or 0,997 5, respectively.
5.1.2.3 Tensile strength (Young’s modulus)
Tensile testing is performed by elongating a specimen and measuring the load carried by the
specimen. From knowledge of the specimen dimensions, the load and deflection data can be
translated into a stress-strain curve.
Results shall be reported as described in ISO 527-1.
5.1.3 Thermal conductivity
a) Thermal conductivity (λ) shall be determined with λ = α·Cp·ρ, where, α is thermal
diffusivity, Cp is specific heat and ρ is density. Thermal diffusivity can be measured and
determined by the following standards: ISO 22007-1, ISO 22007-2, ISO 22007-3 and ISO
22007-4. The measuring standard used shall be identified, and the results shall be
reported as described in that standard.
b) Thermal conductivity should be measured under the standard atmospheric conditions
specified in 5.3.1 of IEC 60068-1:1988.
c) If additional data is necessary, the physical structure of the test and the test conditions
should be noted.
62333-3 © IEC:2010 – 9 –
Figure 2 shows a schematic diagram of measuring apparatus. (Reference from Figure 1 of
ISO 22007-3.)
Temperature
controller
Function
synthesizer
Reference
signal
SSubsubsttrratatee
Heater
Personal
computer
Thermometer
Specimen
SSubsubsttrratate e Sensor
Specimen
Digital
holder
multimeter
Furnace
Lock-in
amplifier
Bias current circuit IEC  2619/09

Figure 2 – Schematic diagram of thermal conductivity measuring apparatus
5.1.4 Environmental conditions
5.1.4.1 Operating temperature
Operating temperature range should be guaranteed within –30 % variation of x, where x = 1 –
(–Rtp/10)
10 at 20 °C.
The measurement frequency should be described.
5.1.4.2 Storage temperature
Highest and lowest storage temperatures should be guaranteed within –30 % variation of x,
(–Rtp/10)
where x = 1 – 10 , after NSS is removed from each storage temperature to 20 °C.
The measurement frequency should be described. Storage temperature and storage time
should be prescribed by test “Ab” specified in IEC 60068-2-1 and test “Bb” specified in
IEC 60068-2-2.
5.1.4.3 Flammability
Manufacturer’s datasheet for NSS should report whether or not the material is compliant with
flammability safety requirements.
NOTE For example, IEC 60695-11-10 or UL94 grade.

– 10 – 62333-3 © IEC:2010
5.1.5 Statement for non-usage of the prohibited chemical materials
5.1.5.1 RoHS
Manufacturer’s datasheet for NSS should report whether or not the material is compliant with
RoHS environmental requirements.
NOTE For example, IEC 62321:2008.
5.1.5.2 Other prohibited chemical materials
Statement of other prohibited chemical materials can be described, if necessary.
5.2 Structure
5.2.1 Thickness
Thickness of NSS should be measured using a micrometer with an accuracy of ±0,02 mm,
according to ISO 3611, having faces with diameters between (5 to 30) mm.
5.2.2 Layer structure
Layer structure of NSS should be reported referencing the types and structures shown in
Table 1. “Magnetic” layer is a magnetic dielectric or a magnetic dielectric composite. “Non-
magnetic” layer is a conductive or a dielectric material.
Figure 3 shows the structure of NSS.
Table 1 – Structural exampl
...