Fixed inductors for electromagnetic interference suppression - Part 2: Sectional specification

IEC 60938-2:1999, applies to fixed inductors designed for electromagnetic interference suppression and which fall within the scope of the generic specification, IEC 60938-1. It is restricted to fixed inductors for which safety tests are appropriate. This implies that inductors specified according to this specification will either be connected to mains supplies, when compliance with the mandatory tests of Table 1 is necessary, or used in other circuit positions where the equipment specification prescribes that some or all of these safety tests are required. This second edition cancels and replaces the first edition published in 1988.

Inductances fixes d'antiparasitage - Partie 2: Spécification intermédiaire

La CEI 60938-2:1999, s'applique à des inductances fixes conçues pour s'opposer aux perturbations électromagnétiques et s'inscrivant dans le domaine d'application de la spécification générique CEI 60938-1. Elle se limite à des inductances fixes pour lesquelles des essais de sécurité sont souhaitables. Cela signifie que les inductances décrites conformément à la présente spécification seront, soit reliées à l'alimentation secteur, auquel cas les essais obligatoires du Tableau 1 sont exigés, soit utilisées en d'autres positions du circuit pour lesquelles la spécification applicable à l'équipement indique que certains ou l'ensemble de ces essais de sécurité sont exigés. Cette deuxième édition annule et remplace la première édition parue en 1988.

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Publication Date
03-Nov-1999
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IEC 60938-2
Edition 2.0 1999-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
QC 280100
Fixed inductors for electromagnetic interference suppression –
Part 2: Sectional specification
Inductances fixes d'antiparasitage –
Partie 2: Spécification intermédiaire
IEC 60938-2:1999
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60938-2
Edition 2.0 1999-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
QC 280100
Fixed inductors for electromagnetic interference suppression –
Part 2: Sectional specification
Inductances fixes d'antiparasitage –
Partie 2: Spécification intermédiaire
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX
ICS 29.100.10; 31.020 ISBN 2-8318-9906-0
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – 60938-2 © IEC:1999
CONTENTS

FOREWORD...........................................................................................................................4

1 General ............................................................................................................................6

1.1 Scope......................................................................................................................6

1.2 Object .....................................................................................................................6

1.3 Normative references ..............................................................................................6

1.4 Information to be given in a detail specification ........................................................7

1.4.1 General .......................................................................................................7

1.4.2 Outline drawing and dimensions...................................................................7

1.4.3 Mounting......................................................................................................8

1.4.4 Ratings and characteristics ..........................................................................8

1.4.5 Marking .......................................................................................................8

1.5 Definitions ...............................................................................................................8

1.6 Marking ...................................................................................................................8

2 Preferred ratings and characteristics.................................................................................9

2.1 Climatic categories ..................................................................................................9

2.2 Values of ratings......................................................................................................9

2.2.1 Rated inductance and tolerance ...................................................................9

2.2.2 Rated voltage (U ).......................................................................................9

2.2.3 Category voltage (U ) ..................................................................................9

2.2.4 Rated temperature.......................................................................................9

2.2.5 Rated current...............................................................................................9

2.2.6 Passive flammability ....................................................................................9

3 Quality assessment procedures ......................................................................................10

3.1 Primary stage of manufacture ................................................................................10

3.2 Structurally similar inductors ..................................................................................10

3.3 Certified records of released lots ...........................................................................10

3.4 Qualification approval ............................................................................................10

3.4.1 Qualification approval on the basis of the fixed sample size

procedures ................................................................................................10

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

3.5.1 Formation of inspection lots .......................................................................13

3.5.2 Test schedule ............................................................................................14

3.5.3 Delayed delivery ........................................................................................14

4 Test and measurement procedures .................................................................................14

4.1 Visual examination and check of dimensions..........................................................14

4.1.1 Dimensions (gauging) ................................................................................14

4.1.2 Dimensions (detail) ....................................................................................14

4.2 Voltage proof.........................................................................................................14

4.3 Insulation resistance..............................................................................................15

4.4 Inductance.............................................................................................................15

4.5 DC line resistance .................................................................................................15

4.6 Robustness of terminations....................................................................................16

4.7 Resistance to soldering heat..................................................................................16

4.7.1 Conditions .................................................................................................16

4.7.2 Final inspection, measurements and requirements .....................................16

4.8 Solderability...........................................................................................................16

4.9 Rapid change of temperature.................................................................................16

---------------------- Page: 4 ----------------------
60938-2 © IEC:1999 – 3 –

4.10 Vibration................................................................................................................16

4.11 Bump ....................................................................................................................17

4.12 Shock....................................................................................................................17

4.13 Container sealing...................................................................................................18

4.14 Climatic sequence .................................................................................................18

4.14.1 Initial measurements..................................................................................18

4.14.2 Dry heat.....................................................................................................18

4.14.3 Damp heat, cyclic, test Db, first cycle .........................................................18

4.14.4 Cold...........................................................................................................18

4.14.5 Low air pressure ........................................................................................18

4.14.6 Damp heat, cyclic, test Db, remaining cycles ..............................................18

4.14.7 Final inspection, measurements and requirements .....................................19

4.15 Damp heat, steady state ........................................................................................19

4.15.1 Final inspection, measurements and requirements .....................................19

4.16 Temperature rise (applies only to inductors with a mass > 5 g)...............................19

4.16.1 Test method ..............................................................................................19

4.16.2 Requirements ............................................................................................20

4.17 Impulse voltage (applies to inductors with more than one winding) .........................20

4.17.1 Initial measurements..................................................................................20

4.17.2 Requirements ............................................................................................20

4.18 Endurance.............................................................................................................20

4.18.1 Test conditions – Endurance current test....................................................20

4.18.2 Test conditions – Endurance voltage test between terminations

(applies to inductors with more than one winding).......................................21

4.19 Passive flammability (if applicable) ........................................................................21

4.20 Component solvent resistance (if applicable) .........................................................21

4.21 Solvent resistance of marking (if applicable) ..........................................................21

Annex A (normative) Test schedule for safety tests only approval .........................................22

Annex B (normative) Test schedule for safety tests and performance tests for

qualification approval, assessment level D.............................................................................25

Annex C (normative) Example of a suitable circuit for the endurance test voltage..................30

Annex D (normative) Declaration of design (confidential to the manufacturer and the

certification body)..................................................................................................................31

Annex E (normative) Test methods for thyristor electromagnetic interference

suppression inductors ...........................................................................................................32

Figure C.1 – Endurance test circuit........................................................................................30

Figure E.1 – Test circuit for temperature rise.........................................................................32

Figure E.2 – Test circuit for interference voltage attenuation..................................................33

Table 1 – Sampling plan for safety tests only.........................................................................12

Table 2 – Sampling plan for safety tests and performance tests, assessment level D .............13

Table 3 – Measuring points ...................................................................................................15

Table 4 – Acceleration...........................................................................................................16

Table 5 – Sweep cycles.........................................................................................................17

Table 6 – Preferred severities ...............................................................................................18

---------------------- Page: 5 ----------------------
– 4 – 60938-2 © IEC:1999
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIXED INDUCTORS FOR ELECTROMAGNETIC
INTERFERENCE SUPPRESSION –
Part 2: Sectional 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 60938-2 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.

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

The text of this standard is based on the following documents:
FDIS Report on voting
40/1111/FDIS 40/1137/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.
---------------------- Page: 6 ----------------------
60938-2 © IEC:1999 – 5 –
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: 7 ----------------------
– 6 – 60938-2 © IEC:1999
FIXED INDUCTORS FOR ELECTROMAGNETIC
INTERFERENCE SUPPRESSION –
Part 2: Sectional specification
1 General
1.1 Scope

This International Standard applies to fixed inductors designed for electromagnetic interference

suppression and which fall within the scope of the generic specification, IEC 60938-1. It is

restricted to fixed inductors for which safety tests are appropriate. This implies that inductors

specified according to this specification will either be connected to mains supplies, when

compliance with the mandatory tests of Table 1 is necessary, or used in other circuit positions

where the equipment specification prescribes that some or all of these safety tests are required.

This standard applies to fixed inductors which will be connected to an a.c. mains or other

supply with a nominal voltage not exceeding 1 000 V a.c. (r.m.s.) or d.c. between conductors

and with a nominal frequency not exceeding 400 Hz.
1.2 Object

The object of this standard is to prescribe standard requirements for safety tests and standard

ratings and characteristics, to select from IEC 60938-1 the appropriate methods of test and to

give general performance requirements for suppression inductors. Test severities and

performance requirements prescribed in detail specifications referring to this sectional

specification shall be of equal or higher performance level. In addition, the minimum require-

ments for safety tests specified herein always apply.
1.3 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 60060-1:1989, High-voltage test techniques – Part 1: General definitions and test requirements

IEC 60063:1963, Preferred number series for resistors and capacitors
Amendment 1 (1967)
Amendment 2 (1977)
IEC 60068-1, Environmental testing – Part 1: General and guidance
IEC 60085:1984, Thermal evaluation and classification of electrical insulation

IEC 60279:1969, Measurement of the winding resistance of an a.c. machine during operation at

alternative voltage

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

terminations
___________
A new edition of this publication exists.
Withdrawn
---------------------- Page: 8 ----------------------
60938-2 © IEC:1999 – 7 –

IEC 60384-14, Fixed capacitors for use in electronic equipment – Part 14: Sectional

specification: Fixed capacitors for electromagnetic interference suppression and connection to

the supply mains

IEC 60938-1:1999, Fixed inductors for electromagnetic interference suppression – Part 1:

Generic specification

IEC 60938-2-1:1999, Fixed inductors for electromagnetic interference suppression – Part 2-1:

Blank detail specification – Inductors for which safety tests are required – Assessment level D

IEC 60938-2-2:1999, Fixed inductors for electromagnetic interference suppression – Part 2-2:

Blank detail specification – Inductors for which safety tests are required (only)

CISPR 16-1-1:2003, Specification for radio disturbance and immunity measuring apparatus and

methods – Part 1-1: Radio disturbance and immunity measuring apparatus – Measuring

apparatus

CISPR 16-1-2:2003, Specification for radio disturbance and immunity measuring apparatus and

methods – Part 1-2: Radio disturbance and immunity measuring apparatus – Ancillary

equipment – Conducted disturbances
ISO 3:1973, Preferred numbers – Series of preferred numbers
1.4 Information to be given in a detail specification
1.4.1 General

Detail specifications shall be derived from the relevant blank detail specification.

Detail specifications shall not specify requirements inferior to those of the generic or sectional

specification. When more severe requirements are included they shall be listed in 1.8 of the

detail specification and indicated in the test schedules, for example by an asterisk.

NOTE The information given in 1.4.2 may, for convenience, be presented in tabular form.

The information given in 1.4.2 to 1.4.5 shall be given in each detail specification and the values

quoted shall preferably be selected from those given in the appropriate clause of this sectional

specification.
1.4.2 Outline drawing and dimensions

There shall be an illustration of the inductor as an aid to easy recognition and for comparison

of the inductor with others. Dimensions and their associated tolerances, which affect

interchangeability and mounting, shall be indicated upon the drawing. All dimensions shall be

stated in millimetres.

Normally the numerical values shall be given for the length of the body, the width and height of

the body or for cylindrical types, the body diameter, and the length and diameter of the

terminations. When necessary, for example when a number of items (inductance values/

voltage ranges) are covered by a detail specification, the dimensions and their associated

tolerances shall be placed in a table below the drawing.

When the configuration is other than described above, the detail specification shall state such

dimensional information as will adequately describe the inductor. When the inductor is not

designed for use on printed boards, this shall be clearly stated in the detail specification.

___________
A new edition of this publication exists.
---------------------- Page: 9 ----------------------
– 8 – 60938-2 © IEC:1999
1.4.3 Mounting

The detail specification shall specify the method of mounting to be recommended for normal

use and the method which is mandatory for the application of the vibration, bump and shock

tests. The design of the inductor may be such that special mounting fixtures are required in its

use. In this case, the detail specification shall describe the mounting fixtures and they shall be

used in the application of the bump, shock and vibration tests. The specified heat sink shall

be used in the application of the endurance test.
1.4.4 Ratings and characteristics

The ratings and characteristics shall be in accordance with the relevant clauses of this

specification.

1.4.4.1 Additional characteristics may be listed, when they are considered necessary to

specify adequately the inductor for design and application purposes.
1.4.5 Marking

Deviations from 1.6 of this sectional specification, shall be specifically stated in the detail

specification.
1.5 Definitions

For the purpose of this International Standard, the definitions in IEC 60938-1 apply.

1.6 Marking

1.6.1 The information given in the marking is normally selected from the following list; the

relative importance of each item is indicated by its position in the list:
a) manufacturer's name (or trade mark);
b) manufacturer's type designation;
c) recognized approval mark;
d) rated inductance and tolerance;
e) rated voltage;
f) rated current;
g) identification of terminations or circuit diagram;
h) rated temperature;
i) climatic category;
j) year and month (or week) of manufacture (this may be in code form);
k) reference to the detail specification.

1.6.2 Marking of the inductor may be omitted when the manufacturer considers that there is

insufficient space, and this fact is recorded in the detail specification. When present, the

marking shall be sufficient to provide a clear identification of the inductor. Any duplication of

information in the marking on the inductor should be avoided.

1.6.3 The packaging containing the inductor(s) shall be clearly marked with all the information

listed in 1.6.1, except g).
1.6.4 Any additional marking shall be so applied that no confusion can arise.
---------------------- Page: 10 ----------------------
60938-2 © IEC:1999 – 9 –
2 Preferred ratings and characteristics
2.1 Climatic categories

Electromagnetic interference suppression inductors covered by this specification are classified

into climatic categories according to the general rules given in IEC 60068-1. The lower and

upper category temperatures and the duration of the damp heat, steady state test shall be

selected from the following:
Lower category temperature: –65 °C, –55 °C, –40 °C, –25 °C and –10 °C.
Upper category temperature: +85 °C, +100 °C, +125 °C and +155 °C.
Duration of the damp heat, steady state test: 21 and 56 days.

The severities for the cold and dry heat tests are the lower and upper category temperatures

respectively.
2.2 Values of ratings
2.2.1 Rated inductance and tolerance

Preferred values of rated inductance are values chosen from the E 6 series of preferred values

given in IEC 60063.
The preferred tolerances on rated inductance are as follows:
±30 %; –30 %/+50 %.
2.2.2 Rated voltage (U )
Preferred values for rated voltages are:
AC inductors: 50 V, 125 V, 250 V, 400 V, 440 V, 480 V and 760 V.
DC induct
...

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