Fixed inductors for electromagnetic interference suppression - Part 1: Generic specification

IEC 60938-1:1999, applies to inductors designed for electromagnetic interference suppression intended for use within, or associated with, electronic or electrical equipment and machines. It is restricted to inductors for which safety tests are appropriate. This second edition cancels and replaces the first edition published in 1988 and constitutes a minor revision related to tables, figures and references. It also includes Amendment 1 (2006).

Inductances fixes d'antiparasitage - Partie 1: Spécification générique

La CEI 60938-1:1999, s'applique à des inductances conçues pour s'opposer aux perturbations électromagnétiques et destinées à être utilisées dans ou en association avec du matériel et des machines électroniques ou électriques. Elle se limite à des inductances pour lesquelles des essais de sécurité sont souhaitables. Cette deuxième édition annule et remplace la première édition parue en 1988, et constitue une révision mineure, ayant trait aux tableaux, figures et références. Elle inclut également l'Amendement 1 (2006).

General Information

Status
Published
Publication Date
28-Oct-1999
Current Stage
DELPUB - Deleted Publication
Completion Date
16-Jun-2021
Ref Project

Buy Standard

Standard
IEC 60938-1:1999 - Fixed inductors for electromagnetic interference suppression - Part 1: Generic specification
English and French language
66 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (sample)

IEC 60938-1
Edition 2.0 1999-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
QC 280000
Fixed inductors for electromagnetic interference suppression –
Part 1: Generic specification
Inductances fixes d'antiparasitage –
Partie 1: Spécification générique
IEC 60938-1:1999
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 1999 IEC, Geneva, Switzerland

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.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite

ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie

et les microfilms, sans l'accord écrit de la CEI ou du Comité national de la CEI du pays du demandeur.

Si vous avez des questions sur le copyright de la CEI ou si vous désirez obtenir des droits supplémentaires sur cette

publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.

IEC Central Office
3, rue de Varembé
CH-1211 Geneva 20
Switzerland
Email: inmail@iec.ch
Web: 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.
ƒ Catalogue of IEC publications: www.iec.ch/searchpub

The IEC on-line Catalogue enables you to search by a variety of criteria (reference number, text, technical committee,…).

It also gives information on projects, withdrawn and replaced publications.
ƒ IEC Just Published: www.iec.ch/online_news/justpub

Stay up to date on all new IEC publications. Just Published details twice a month all new publications released. Available

on-line and also by email.
ƒ Electropedia: www.electropedia.org

The world's leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions

in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical

Vocabulary online.
ƒ Customer Service Centre: www.iec.ch/webstore/custserv

If you wish to give us your feedback on this publication or need further assistance, please visit the Customer Service

Centre FAQ or contact us:
Email: csc@iec.ch
Tel.: +41 22 919 02 11
Fax: +41 22 919 03 00
A propos de la CEI

La Commission Electrotechnique Internationale (CEI) est la première organisation mondiale qui élabore et publie des

normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications CEI

Le contenu technique des publications de la CEI est constamment revu. Veuillez vous assurer que vous possédez

l’édition la plus récente, un corrigendum ou amendement peut avoir été publié.
ƒ Catalogue des publications de la CEI: www.iec.ch/searchpub/cur_fut-f.htm

Le Catalogue en-ligne de la CEI vous permet d’effectuer des recherches en utilisant différents critères (numéro de référence,

texte, comité d’études,…). Il donne aussi des informations sur les projets et les publications retirées ou remplacées.

ƒ Just Published CEI: www.iec.ch/online_news/justpub

Restez informé sur les nouvelles publications de la CEI. Just Published détaille deux fois par mois les nouvelles

publications parues. Disponible en-ligne et aussi par email.
ƒ Electropedia: www.electropedia.org

Le premier dictionnaire en ligne au monde de termes électroniques et électriques. Il contient plus de 20 000 termes et

définitions en anglais et en français, ainsi que les termes équivalents dans les langues additionnelles. Egalement appelé

Vocabulaire Electrotechnique International en ligne.
ƒ Service Clients: www.iec.ch/webstore/custserv/custserv_entry-f.htm

Si vous désirez nous donner des commentaires sur cette publication ou si vous avez des questions, visitez le FAQ du

Service clients ou contactez-nous:
Email: csc@iec.ch
Tél.: +41 22 919 02 11
Fax: +41 22 919 03 00
---------------------- Page: 2 ----------------------
IEC 60938-1
Edition 2.0 1999-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
QC 280000
Fixed inductors for electromagnetic interference suppression –
Part 1: Generic specification
Inductances fixes d'antiparasitage –
Partie 1: Spécification générique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX
ICS 29.100.10; 31.020 ISBN 2-8318-9863-3
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – 60938-1 © IEC:1999
CONTENTS

FOREWORD...........................................................................................................................5

1 General ............................................................................................................................7

1.1 Scope......................................................................................................................7

1.2 Normative references ..............................................................................................7

2 Technical data ..................................................................................................................9

2.1 Units and symbols ...................................................................................................9

2.2 Definitions ...............................................................................................................9

2.3 Preferred values ....................................................................................................11

2.4 Marking .................................................................................................................11

2.4.1 General .....................................................................................................11

2.4.2 Coding.......................................................................................................12

3 Quality assessment procedures ......................................................................................12

3.1 General .................................................................................................................12

3.2 Primary stage of manufacture ................................................................................12

3.3 Structurally similar inductors ..................................................................................12

3.4 Qualification approval procedures ..........................................................................12

3.4.1 Eligibility for qualification approval..............................................................12

3.4.2 Application for qualification approval ..........................................................12

3.4.3 Test procedure for qualification approval....................................................12

3.4.4 Granting of qualification approval ...............................................................12

3.4.5 Maintenance of qualification approval.........................................................13

3.5 Quality conformance inspection .............................................................................13

3.5.1 Certified test records of released lots .........................................................13

3.5.2 Delayed delivery ........................................................................................13

3.5.3 Release for delivery before the completion of group B tests........................13

3.6 Alternative test methods ........................................................................................13

3.7 Unchecked parameters..........................................................................................13

4 Test and measurement procedure...................................................................................14

4.1 General .................................................................................................................14

4.2 Standard atmospheric conditions ...........................................................................14

4.2.1 Standard atmospheric conditions for testing ...............................................14

4.2.2 Recovery conditions...................................................................................14

4.2.3 Referee conditions.....................................................................................14

4.2.4 Reference conditions .................................................................................15

4.3 Drying....................................................................................................................15

4.4 Visual examination and check of dimensions..........................................................15

4.4.1 Visual examination.....................................................................................15

4.4.2 Dimensions (gauging) ................................................................................15

4.4.3 Dimensions (detail) ....................................................................................15

4.4.4 Creepage distances and clearances...........................................................15

4.5 Insulation resistance..............................................................................................16

4.6 Voltage proof.........................................................................................................19

4.6.1 Test circuit (for the test between terminations) ...........................................19

4.6.2 Test...........................................................................................................20

4.6.3 Requirements ............................................................................................22

4.7 Inductance.............................................................................................................22

4.8 Insertion loss .........................................................................................................22

---------------------- Page: 4 ----------------------
60938-1 © IEC:1999 – 3–

4.9 Robustness of terminations....................................................................................22

4.9.1 Test Ua – Tensile .....................................................................................22

4.9.2 Test Ub – Bending (first half of the sample)................................................23

4.9.3 Test Uc – Torsion (second half of the sample)............................................23

4.9.4 Test Ud – Torque (for terminations with threaded studs or screws and

for integral mounting devices) ....................................................................23

4.9.5 Visual examination.....................................................................................23

4.10 Resistance to soldering heat..................................................................................23

4.11 Solderability (applicable only for terminations intended to be soldered)...................24

4.12 Rapid change of temperature.................................................................................24

4.13 Vibration................................................................................................................25

4.14 Bump ....................................................................................................................25

4.15 Shock....................................................................................................................25

4.16 Container sealing...................................................................................................25

4.17 Climatic sequence .................................................................................................25

4.17.1 Initial measurements..................................................................................26

4.17.2 Dry heat.....................................................................................................26

4.17.3 Damp heat, cyclic, test Db, first cycle .........................................................26

4.17.4 Cold...........................................................................................................26

4.17.5 Low air pressure ........................................................................................26

4.17.6 Damp heat, cyclic, test Db, remaining cycles ..............................................27

4.17.7 Final measurements ..................................................................................27

4.18 Damp heat, steady state ........................................................................................27

4.19 Temperature rise ...................................................................................................27

4.20 Endurance.............................................................................................................28

4.21 Passive flammability ..............................................................................................28

4.22 Active flammability.................................................................................................29

4.23 Solvent resistance of marking ................................................................................29

4.24 Component solvent resistance ...............................................................................29

4.24.1 Initial measurements..................................................................................29

Annex A (normative) Interpretation of sampling plans and procedures as described in

IEC 60410 for use within the IEC quality assessment system for electronic components

(IECQ) ..................................................................................................................................30

Annex B (normative) Rules for the preparation of detail specifications for capacitors

and resistors for electronic equipment ...................................................................................31

Annex C (normative) Requirements for earth inductors .........................................................32

Figure 1 – Voltage proof test circuit .......................................................................................20

---------------------- Page: 5 ----------------------
– 4 – 60938-1 © IEC:1999

Table 1 – Reference test: standard atmospheric conditions ...................................................15

Table 2 – Creepage distances and clearances.......................................................................16

Table 3 – Measuring voltage .................................................................................................16

Table 4 – Measuring points ...................................................................................................18

Table 5 – Force.....................................................................................................................23

Table 6 – Torque...................................................................................................................23

Table 7 – Number of cycles ...................................................................................................27

Table 8 – Severities and requirements...................................................................................29

Table C.1 – Rated current related to minimum cross-sectional area of copper lead

(mm ) of the earth inductor ...................................................................................................32

---------------------- Page: 6 ----------------------
60938-1 © IEC:1999 – 5–
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIXED INDUCTORS FOR ELECTROMAGNETIC
INTERFERENCE SUPPRESSION –
Part 1: Generic specification
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 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 60938-1 has been prepared by IEC technical committee 40:

Capacitors and resistors for electronic equipment.

This second edition cancels and replaces the first edition published in 1988 and constitutes a

minor revision related to tables, figures and references. It also includes Amendment 1 (2006).

This bilingual version, published in 2008-08, corresponds to the English version.

---------------------- Page: 7 ----------------------
– 6 – 60938-1 © IEC:1999
The text of this standard is based on the following documents:
FDIS Report on voting
40/1110/FDIS 40/1136/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.
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.

A list of all parts of the IEC 60938 series, under the general title: Fixed inductors for

electromagnetic interference suppression, can be found on the IEC website.

The QC number that appears on the front cover of this publication is the specification number

in the IEC quality assessment system for electronic components (IECQ).

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.
---------------------- Page: 8 ----------------------
60938-1 © IEC:1999 – 7–
FIXED INDUCTORS FOR ELECTROMAGNETIC
INTERFERENCE SUPPRESSION –
Part 1: Generic specification
1 General
1.1 Scope

This International Standard applies to inductors designed for electromagnetic interference

suppression intended for use within, or associated with, electronic or electrical equipment and

machines. It is restricted to inductors for which safety tests are appropriate.
The combination of two or more inductors within one enclosure is also included.

Inductors within the scope of this standard may also be used to protect apparatus and

machines from electrical noise and voltage or current transients coming from either the supply

or from other parts of the apparatus.

This standard does not necessarily apply in its entirety to inductors intended for use on motor

vehicles, in aircraft or for marine applications.
1.2 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 60027 (all parts), Letter symbols to be used in electrical technology
IEC 60050 (all parts), International Electrotechnical Vocabulary (IEV)
IEC 60062:1992 , Marking codes for resistors and capacitors
IEC 60068-1:1988, Environmental testing – Part 1: General and guidance
Amendment 1 (1992)
IEC 60068-2-1:1990 , Environmental testing – Part 2: Tests – Tests A: Cold
Amendment 1 (1993)
Amendment 2 (1994)

IEC 60068-2-2:1974 , Basic environmental testing procedures – Part 2: Tests – Tests B: Dry

Heat
Amendment 1 (1993)
Amendment 2 (1994)

IEC 60068-2-3 :1969, Basic environmental testing procedures – Part 2: Tests – Test Ca:

Damp heat, steady state
Amendment 1 (1984)
___________
A new edition of this publication exists.
This publication has been withdrawn and replaced by IEC 60068-2-78.
---------------------- Page: 9 ----------------------
– 8 – 60938-1 © IEC:1999

IEC 60068-2-6:1995 , Environmental testing – Part 2-6: Tests – Test Fc: Vibration (sinusoidal)

IEC 60068-2-13:1983, Environmental testing – Part 2: Tests – Test M: Low air pressure

IEC 60068-2-14:1984, Environmental testing – Part 2: Tests – Test N: Change of temperature

Amendment 1 (1986)

IEC 60068-2-17:1994, Basic environmental testing procedures – Part 2: Tests – Test Q:

Sealing
IEC 60068-2-20:1979, Environmental testing – Part 2: Tests – Test T: Soldering
Amendment 2 (1987)

IEC 60068-2-21:1983 , Basic environmental testing procedures – Part 2: Tests – Test U:

Robustness of terminations and integral mounting devices
Amendment 2 (1991)
Amendment 3 (1992)

IEC 60068-2-27:1987 , Basic environmental testing procedures – Part 2-27: Tests – Test Ea

and guidance: Shock

IEC 60068-2-29:1987, Environmental testing – Part 2: Tests – Test Eb and guidance: Bump

IEC 60068-2-30:1980 , Basic environmental testing procedures – Part 2: Tests – Test Db and

guidance: Damp heat, cyclic (12 + 12 hour cycle)
Amendment 1 (1985)

IEC 60068-2-45:1980, Environmental testing – Part 2: Tests – Test XA and guidance:

Immersion in cleaning solvents
Amendment 1 (1993)

IEC 60294:1969, Measurement of the dimensions of a cylindrical component having two axial

terminations

IEC 60335-1:1991 , Safety of household and similar electrical appliances – Part 1: General

requirements
IEC 60410:1973, Sampling plans and procedures for inspection by attributes
IEC 60617 (all parts), Graphical symbols for diagrams

IEC 60695-2-2:1991 , Fire hazard testing – Part 2: Test methods – Section 2: Needle-flame

test
Amendment 1 (1994)

CISPR 17:1981, Methods of measurement of the suppression characteristics of passive radio

interference filters and suppression components

IEC QC 001002-3:1998 , IEC Quality Assessment System for Electronic Components (IECQ) –

Rules of Procedure – Part 3: Approval procedures

ISO 1000:1992, SI units and recommendations for the use of their multiples and of certain

other units
___________
This publication has been withdrawn and replaced by IEC 60695-11-5.
---------------------- Page: 10 ----------------------
60938-1 © IEC:1999 – 9–
2 Technical data
2.1 Units and symbols

Units, graphical symbols, letter symbols and terminology shall, whenever possible, be taken

from the following publications:
IEC 60027
IEC 60050
IEC 60617
ISO 1000

When further items are required, they shall be derived in accordance with the principles of the

documents listed above.
2.2 Definitions
For the purpose of this International Standard, the following definitions apply.
2.2.1
type
a group of components having similar design features and the similarity of whose

manufacturing techniques enables them to be grouped together either for qualification approval

or for quality conformance inspection
They are generally covered by a single detail specification.

NOTE Components described in several detail specifications, may, in some cases, be considered as belonging to

the same type.
2.2.2
style
a sub-division of a type, generally based on dimensional factors
A style may include several variants, generally of a mechanical order
2.2.3
family (of electronic components)

a group of electronic components which predominantly displays a particular physical attribute

and/or fulfils a defined function
2.2.4
sub-family (of electronic components)

a group of components within a family manufactured by similar technological methods

2.2.5
rated voltage (U )

rated voltage is either the maximum r.m.s. operating voltage of rated frequency or the

maximum d.c. operating voltage which may be applied continuously to the terminations of the

inductor at any temperature between the lower category temperature and the rated temperature

NOTE For inductors with only one winding, the rated voltage should only be applied between one terminal and any

conducting surface with which the case is liable to come into contact in normal use. For inductors having more than

one winding, the rated voltage may be applied across two individual windings.
2.2.6
category voltage (U )

maximum voltage which may be applied continuously to an inductor at its upper category

temperature
---------------------- Page: 11 ----------------------
– 10 – 60938-1 © IEC:1999
2.2.7
lower category temperature

minimum external surface temperature for which the inductor has been designed to operate

continuously
2.2.8
upper category temperature

maximum external surface temperature for which the inductor has been designed to operate

continuously

NOTE The external surface temperature can be affected by internal heating due to the lead-through current. The

terminations are considered to be part of the external surface.
2.2.9
rated temperature
maximum ambient temperature at which an inductor can carry its rated current
2.2.10
rated current

maximum r.m.s. operating current at rated frequency or maximum d.c. operating current which

allows continuous operation of the inductor at the rated temperature. It is assigned by the

manufacturer for one or both of the following conditions:
a) free air (I );
b) with a specified heat sink (I ).
2.2.11
rated inductance (L )

inductance value for which the inductor has been designed and which is usually indicated upon it

2.2.12
insertion loss

ratio of the voltage before and after the insertion of the suppressor in the circuit as measured

at the terminations

NOTE 1 The insertion loss can be measured either with a symmetrical or an asymmetrical test circuit.

NOTE 2 When expressed in decibels, the insertion loss is 20 times the logarithm of the ratio stated.

2.2.13
asymmetrical test circuit

a test circuit in which the inductor under test is connected with a coaxial cable of which the

outer conductor constitutes a return path for high-frequency current
[CISPR 17:1981, 3.5 modified]
2.2.14
symmetrical test circuit

a test circuit in which the inductor under test is connected with screened conductor pairs in

which the asymmetrical voltage is small enough to be neglected
[CISPR 17:1981, 3.6 modified]
2.2.15
insulated inductor
an inductor in which all terminations connected to a section
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.