EN 60938-1:1999

SLOVENSKI STANDARD
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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
– 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

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

– 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

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
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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 in
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