1、INTERNATIONALSTANDARDIEC60938-1QC 280000Second edition1999-10Fixed inductors for electromagneticinterference suppression Part 1:Generic specificationInductances fixes dantiparasitage Partie 1:Spcification gnriqueReference numberIEC 60938-1:1999(E)Copyright International Electrotechnical Commission P
2、rovided by IHS under license with IECNot for ResaleNo reproduction or networking permitted without license from IHS-,-NumberingAs from 1 January 1997 all IEC publications are issued with a designation in the60000 series.Consolidated publicationsConsolidated versions of some IEC publications includin
3、g amendments areavailable. For example, edition numbers 1.0, 1.1 and 1.2 refer, respectively, to thebase publication, the base publication incorporating amendment 1 and the basepublication incorporating amendments 1 and 2.Validity of this publicationThe technical content of IEC publications is kept
4、under constant review by the IEC,thus ensuring that the content reflects current technology.Information relating to the date of the reconfirmation of the publication is availablein the IEC catalogue.Information on the subjects under consideration and work in progress undertakenby the technical commi
5、ttee which has prepared this publication, as well as the listof publications issued, is to be found at the following IEC sources: IEC web site* Catalogue of IEC publicationsPublished yearly with regular updates(On-line catalogue)* IEC BulletinAvailable both at the IEC web site* and as a printed peri
6、odicalTerminology, graphical and letter symbolsFor general terminology, readers are referred to IEC 60050: InternationalElectrotechnical Vocabulary (IEV). For graphical symbols, and letter symbols and signs approved by the IEC forgeneral use, readers are referred to publications IEC 60027: Letter sy
7、mbols to beused in electrical technology, IEC 60417: Graphical symbols for use on equipment.Index, survey and compilation of the single sheets and IEC 60617: Graphical symbolsfor diagrams.* See web site address on title page.Copyright International Electrotechnical Commission Provided by IHS under l
8、icense with IECNot for ResaleNo reproduction or networking permitted without license from IHS-,-INTERNATIONALSTANDARDIEC60938-1QC 280000Second edition1999-10Fixed inductors for electromagneticinterference suppression Part 1:Generic specificationInductances fixes dantiparasitage Partie 1:Spcification
9、 gnriquePRICE CODE IEC 1999 Copyright - all rights reservedNo part of this publication may be reproduced or utilized in any form or by any means, electronic ormechanical, including photocopying and microfilm, without permission in writing from the publisher.International Electrotechnical Commission
10、3, rue de Varemb Geneva, SwitzerlandTelefax: +41 22 919 0300 e-mail: inmailiec.ch IEC web site http:/www.iec.chPFor price, see current catalogueCommission Electrotechnique InternationaleInternational Electrotechnical CommissionCopyright International Electrotechnical Commission Provided by IHS under
11、 license with IECNot for ResaleNo reproduction or networking permitted without license from IHS-,- 2 60938-1 IEC:1999(E)CONTENTSPageFOREWORD 4Clause1 General 61.1 Scope . 61.2 Normative references 62 Technical data 82.1 Units and symbols. 82.2 Definitions. 82.3 Preferred values 102.4 Marking. 113 Qu
12、ality assessment procedures 113.1 General. 113.2 Primary stage of manufacture 113.3 Structurally similar inductors . 113.4 Qualification approval procedures . 113.5 Quality conformance inspection. 123.6 Alternative test methods 123.7 Unchecked parameters . 134 Test and measurement procedure 134.1 Ge
13、neral. 134.2 Standard atmospheric conditions. 134.3 Drying . 144.4 Visual examination and check of dimensions . 144.5 Insulation resistance . 154.6 Voltage proof 184.7 Inductance 214.8 Insertion loss 214.9 Robustness of terminations . 214.10 Resistance to soldering heat . 224.11 Solderability (appli
14、cable only for terminations intended to be soldered) 234.12 Rapid change of temperature 234.13 Vibration . 244.14 Bump 244.15 Shock . 244.16 Container sealing 244.17 Climatic sequence. 254.18 Damp heat, steady state 264.19 Temperature rise. 264.20 Endurance 274.21 Passive flammability 274.22 Active
15、flammability 284.23 Solvent resistance of marking . 284.24 Component solvent resistance. 28Copyright International Electrotechnical Commission Provided by IHS under license with IECNot for ResaleNo reproduction or networking permitted without license from IHS-,-60938-1 IEC:1999(E) 3 PageAnnex A (nor
16、mative) Interpretation of sampling plans and procedures as describedin IEC 60410 for use within the IEC quality assessment system for electroniccomponents (IECQ) 29Annex B (normative) Rules for the preparation of detail specifications for capacitorsand resistors for electronic equipment 30Annex C (n
17、ormative) Requirements for earth inductors . 31Copyright International Electrotechnical Commission Provided by IHS under license with IECNot for ResaleNo reproduction or networking permitted without license from IHS-,- 4 60938-1 IEC:1999(E)INTERNATIONAL ELECTROTECHNICAL COMMISSION_FIXED INDUCTORS FO
18、R ELECTROMAGNETICINTERFERENCE SUPPRESSION Part 1: Generic specificationFOREWORD1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprisingall national electrotechnical committees (IEC National Committees). The object of the IEC is to promoteinter
19、national co-operation on all questions concerning standardization in the electrical and electronic fields. Tothis end and in addition to other activities, the IEC publishes International Standards. Their preparation isentrusted to technical committees; any IEC National Committee interested in the su
20、bject dealt with mayparticipate in this preparatory work. International, governmental and non-governmental organizations liaising withthe IEC also participate in this preparation. The IEC collaborates closely with the International Organization forStandardization (ISO) in accordance with conditions
21、determined by agreement between the two organizations.2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, aninternational consensus of opinion on the relevant subjects since each technical committee has representationfrom all interested National Comm
22、ittees.3) The documents produced have the form of recommendations for international use and are published in the formof standards, technical specifications, technical reports or guides and they are accepted by the NationalCommittees in that sense.4) In order to promote international unification, IEC
23、 National Committees undertake to apply IEC InternationalStandards transparently to the maximum extent possible in their national and regional standards. Anydivergence between the IEC Standard and the corresponding national or regional standard shall be clearlyindicated in the latter.5) The IEC prov
24、ides no marking procedure to indicate its approval and cannot be rendered responsible for anyequipment declared to be in conformity with one of its standards.6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subjectof patent rights. The IEC
25、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 constitute
26、s atechnical revision.The text of this standard is based on the following documents:FDIS Report on voting40/1110/FDIS 40/1136/RVDFull information on the voting for the approval of this standard can be found in the report onvoting indicated in the above table.This publication has been drafted in acco
27、rdance with the ISO/IEC Directives, Part 3.The QC number that appears on the front cover of this publication is the specification numberin the IEC Quality Assessment System for Electronic Components (IECQ).Annexes A, B and C form an integral part of this standard.Copyright International Electrotechn
28、ical Commission Provided by IHS under license with IECNot for ResaleNo reproduction or networking permitted without license from IHS-,-60938-1 IEC:1999(E) 5 The committee has decided that this publication remains valid until 2005.At this date, in accordance with the committees decision, the publicat
29、ion will be reconfirmed; withdrawn; replaced by a revised edition, or amended.A bilingual version of this publication may be issued at a later date.Copyright International Electrotechnical Commission Provided by IHS under license with IECNot for ResaleNo reproduction or networking permitted without
30、license from IHS-,- 6 60938-1 IEC:1999(E)FIXED INDUCTORS FOR ELECTROMAGNETICINTERFERENCE SUPPRESSION Part 1: Generic specification1 General1.1 ScopeThis International Standard applies to inductors designed for electromagnetic interferencesuppression intended for use within, or associated with, elect
31、ronic or electrical equipment andmachines. 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 andmachines from electrical
32、 noise and voltage or current transients coming from either the supplyor from other parts of the apparatus.This standard does not necessarily apply in its entirety to inductors intended for use on motorvehicles, in aircraft or for marine applications.1.2 Normative referencesThe following normative d
33、ocuments contain provisions which, through reference in this text,constitute provisions of this International Standard. For dated references, subsequent amendmentsto, or revisions of, any of these publications do not apply. However, parties to agreementsbased on this International Standard are encou
34、raged to investigate the possibility of applyingthe most recent editions of the normative documents indicated below. For undated references,the latest edition of the normative document referred to applies. Members of IEC and ISOmaintain registers of currently valid International Standards.IEC 60027
35、(all parts), Letter symbols to be used in electrical technologyIEC 60050 (all parts), International Electrotechnical Vocabulary (IEV)IEC 60062:1992, Marking codes for resistors and capacitorsIEC 60068-1:1988, Environmental testing Part 1: General and guidanceAmendment 1 (1992)IEC 60068-2-1:1990, Env
36、ironmental testing Part 2: Tests Tests A: ColdAmendment 1 (1993)Amendment 2 (1994)IEC 60068-2-2:1974, Environmental testing Part 2: Tests Tests B: Dry HeatAmendment 1 (1993)Amendment 2 (1994)IEC 60068-2-3:1969, Environmental testing Part 2: Tests Test Ca: Damp heat, steady stateAmendment 1 (1984)IEC
37、 60068-2-6:1995, Environmental testing Part 2: Tests Test Fc: Vibration (sinusoidal)Copyright International Electrotechnical Commission Provided by IHS under license with IECNot for ResaleNo reproduction or networking permitted without license from IHS-,-60938-1 IEC:1999(E) 7 IEC 60068-2-13:1983, En
38、vironmental testing Part 2: Tests Test M: Low air pressureIEC 60068-2-14:1984, Environmental testing Part 2: Tests Test N: Change of temperatureAmendment 1 (1986)IEC 60068-2-17:1994, Environmental testing Part 2: Tests Test Q: SealingIEC 60068-2-20:1979, Environmental testing Part 2: Tests Test T: S
39、olderingAmendment 2 (1987)IEC 60068-2-21:1983, Environmental testing Part 2: Tests Test U: Robustness ofterminations and integral mounting devicesAmendment 2 (1991)Amendment 3 (1992)IEC 60068-2-27:1987, Environmental testing Part 2: Tests Test Ea and guidance: ShockIEC 60068-2-29:1987, Environmental
40、 testing Part 2: Tests Test Eb and guidance: BumpIEC 60068-2-30:1980, Environmental testing Part 2: Tests Test Db and guidance: Dampheat, 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 solventsAmendment
41、 1 (1993)IEC 60294:1969, Measurement of the dimensions of a cylindrical component having two axialterminationsIEC 60335-1:1991, Safety of household and similar electrical appliances Part 1: GeneralrequirementsIEC 60410:1973, Sampling plans and procedures for inspection by attributesIEC 60617 (all pa
42、rts), Graphical symbols for diagramsIEC 60695-2-2:1991, Fire hazard testing Section 2: Needle-flame testAmendment 1 (1994)CISPR 17:1981, Methods of measurement of the suppression characteristics of passive radiointerference filters and suppression componentsIEC QC 001002-3:1998, Rules of Procedure o
43、f the IEC Quality Assessment System for ElectronicComponents (IECQ) Part 3: Approval proceduresISO 1000:1992, SI units and recommendations for the use of their multiples and of certainother unitsCopyright International Electrotechnical Commission Provided by IHS under license with IECNot for ResaleN
44、o reproduction or networking permitted without license from IHS-,- 8 60938-1 IEC:1999(E)2 Technical data2.1 Units and symbolsUnits, graphical symbols, letter symbols and terminology shall, whenever possible, be takenfrom the following publications:IEC 60027IEC 60050IEC 60617ISO 1000When further item
45、s are required they shall be derived in accordance with the principles of thedocuments listed above.2.2 DefinitionsFor the purpose of this International Standard, the following definitions apply.2.2.1typea group of components having similar design features and the similarity of whosemanufacturing te
46、chniques enables them to be grouped together either for qualification approvalor for quality conformance inspectionThey are generally covered by a single detail specification.NOTE Components described in several detail specifications, may, in some cases, be considered as belonging tothe same type.2.
47、2.2stylea sub-division of a type, generally based on dimensional factors.A style may include several variants, generally of a mechanical order2.2.3family (of electronic components)a group of electronic components which predominantly displays a particular physical attributeand/or fulfils a defined fu
48、nction2.2.4sub-family (of electronic components)a group of components within a family manufactured by similar technological methods2.2.5rated voltage (UR)rated voltage is either the maximum r.m.s. operating voltage of rated frequency or themaximum d.c. operating voltage which may be applied continuously to the terminations of theinductor at any temperature between the lower category temperature and the rated temperatureNOTE For inductors with only one winding, the rated voltage should only be applied between one terminal and anyconducting surface wi
