SIST EN 60938-1:2002
(Main)Fixed inductors for electromagnetic interference suppression -- Part 1: Generic specification
Fixed inductors for electromagnetic interference suppression -- Part 1: Generic specification
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. It may not necessarily apply in its entirety to inductors intended for use on motor vehicles, in aircraft or for marine applications.
Drosseln zur Unterdrückung elektromagnetischer Störungen -- Teil 1: Fachgrundspezifikation
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).
Fixed inductors for electromagnetic interference suppression - Part 1: General specification (IEC 60938-1:1999)
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Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 60938-1:2002
01-september-2002
Fixed inductors for electromagnetic interference suppression - Part 1: General
specification (IEC 60938-1:1999)
Fixed inductors for electromagnetic interference suppression -- Part 1: Generic
specification
Drosseln zur Unterdrückung elektromagnetischer Störungen -- Teil 1:
Fachgrundspezifikation
Inductances fixes d'antiparasitage -- Partie 1: Spécification générique
Ta slovenski standard je istoveten z: EN 60938-1:1999
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
SIST EN 60938-1:2002 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 60938-1:2002
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SIST EN 60938-1:2002
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SIST EN 60938-1:2002
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SIST EN 60938-1:2002
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SIST EN 60938-1:2002
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
V
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
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SIST EN 60938-1:2002
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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
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60938-1 © IEC:1999 – 3–
4.9 Robustness of terminations.22
4.9.1 Test Ua – Tensile .22
1
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
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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
2
(mm ) of the earth inductor .32
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SIST EN 60938-1:2002
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.
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SIST EN 60938-1:2002
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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.
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SIST EN 60938-1:2002
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)
)
1
IEC 60062:1992 , Marking codes for resistors and capacitors
IEC 60068-1:1988, Environmental testing – Part 1: General and guidance
Amendment 1 (1992)
1)
IEC 60068-2-1:1990 , Environmental testing – Part 2: Tests – Tests A: Cold
Amendment 1 (1993)
Amendment 2 (1994)
1)
IEC 60068-2-2:1974 , Basic environmental testing procedures – Part 2: Tests – Tests B: Dry
Heat
Amendment 1 (1993)
Amendment 2 (1994)
)
2
IEC 60068-2-3 :1969, Basic environmental testing procedures – Part 2: Tests – Test Ca:
Damp heat, steady state
Amendment 1 (1984)
___________
1)
A new edition of this publication exists.
)
2
This publication has been withdrawn and replaced by IEC 60068-2-78.
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1)
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)
1)
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)
1)
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
1)
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
1)
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
)
3
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
1)
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
___________
)
3
This publication has been withdrawn and replaced by IEC 60695-11-5.
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SIST EN 60938-1:2002
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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 )
R
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 )
C
maximum voltage which may be applied continuously to an inductor at its upper category
temperature
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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 );
RO
b) with a specified heat sink (I ).
RH
2.2.11
rated inductance (L )
R
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 may be raised to a potential
different (but not less than the rated voltage) from that of any conducting surface with which
the case is liable to come into contact in normal use
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2.2.16
uninsulated inductor
an inductor in which at least one of the terminations connected to a section cannot be raised to
a potential different (but not less than the rated voltage) from that of any conducting surface
with which the case is liable to come into contact in normal use
2.2.17
electromagnetic interference suppression inductor
an inductor which at mains frequency has a low impedance, but which at radio frequency has a
high inductive impedance
NOTE 1 It may be used for reducing the interference at frequencies caused by electrical equipment.
NOTE 2 These inductors are sometimes known as RF chokes.
2.2.18
current-compensated inductor
an inductor having more than one winding on a single core arranged in such a way that the
resultant magnetization caused by the current is near zero
2.2.19
earth inductor
an inductor connected in the earth lead of an equipment.
For requirements for earth inductors, see Annex C.
2.2.20
thyristor inductor
an inductor used in thyristor controlled circuits
2.2.21
mains inductor
an inductor intended for direct electrical connection to the supply mains
NOTE This inductor may form part of an equipment.
2.2.22
TV choke
an inductor designed to reduce interference mainly in the frequency range 30 MHz to 300 MHz
NOTE Unencapsulated, non-current compensated TV chokes are not within the scope of this specification, but
should be considered as part of the equipment wiring.
2.2.23
visible damage
visible damage which reduces the usability of the inductor unit for intended purpose
2.3 Preferred values
Each sectional specification shall prescribe the preferred values appropriate to the sub-family
covered by that sectional specification.
2.4 Marking
2.4.1 General
The sectional specification shall indicate the identification criteria and other information to be
shown on the inductors and the packing.
The order of priority for marking small inductors shall be specified.
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2.4.2 Coding
When coding is used for tolerance or date of manufacture, the method shall be selected from
those given in IEC 60062.
3 Quality assessment procedures
3.1 General
When these standards are used for the purpose of a full quality assessment system such
as the IEC quality assessment system for electronic components (IECQ), compliance to 3.4 or
3.5 is required.
When these standards are used outside quality assessment systems for purposes such as
design proving or type testing, the procedures and requirements of 3.4.1 and 3.4.3 may be
used, but the tests and parts of tests shall be applied in the order given in the test schedules.
Before inductors can be qualified according to the procedures of this clause, the manufacturer shall
obtain the approval of his organization in accordance with the provisions of IEC QC 001002-3.
For certification by an independent test laboratory the procedure of 3.4.3 shall be sufficient,
except that the test laboratory will produce the evidence of conformance.
3.2 Primary stage of manufacture
The primary stage of manufacture is the wi
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