1、BRITISH STANDARD BS EN 125000:1998 Harmonized system of quality assessment for electronic components Generic specification: Cores made of ferrite materials The European Standard EN 125000:1997 has the status of a British Standard ICS 29.100.10BSEN125000:1998 This British Standard, havingbeen prepare
2、d under thedirection of the Electrotechnical Sector Board, waspublished under the authorityof the Standards Boardand comes intoeffecton15March 1998 BSI 04-1999 ISBN 0 580 28887 0 National foreword This British Standard is the English language version of EN125000:1997 published by the European Electr
3、onic Components Committee (CECC) of the European Committee for Electrotechnical Standardization (CENELEC). It supersedes BSCECC25000:1997 which will be withdrawn on1998-09-01. The UK participation in its preparation was entrusted to Technical Committee EPL/51, Transformers, inductors, magnetic compo
4、nents and ferrite materials, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European
5、 developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards
6、 Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for t
7、heir correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 11 and a back cover. This standard has been updated (see
8、 copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSEN125000:1998 BSI 04-1999 i Contents Page National foreword Inside front cover Foreword 2 Text of EN 125000
9、3ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 125000 December 1997 ICS 29.100.10 Supersedes CECC 25 000:1976 Descriptors: Ferrite cores, generic specification, quality assessment, capability approval, test and measurement procedures English version Generic Specification: Cores made o
10、f ferrite materials Spcification gnrique: Noyauxralisspartir de matriaux ferrites Fachgrundspezifikation: Ferritkerne This European Standard was approved by CENELEC on1997-10-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving t
11、his European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versi
12、ons (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of
13、Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechni
14、que Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1997 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 125000:1997 EEN125000:1997 2 BSI 04-1999 Foreword This European Stand
15、ard was prepared by the Technical Committee CENELEC TC/CECC SC51X, Magnetic Components: Cores and soft magnetic materials. It is based, wherever possible on the Publications of the International Electrotechnical Commission, and in particular on IEC60367 and IEC60723. The text of the draft was submit
16、ted to the Unique Acceptance Procedure and was approved by CENELEC as EN125000 on1997-10-01. This European Standard supersedes CECC25000:1976 (including its amendment A1:1982). The following dates were fixed: Contents Page Foreword 2 1 General 3 1.1 Scope 3 1.2 Normative references 3 1.3 Units, symb
17、ols and terminology 4 1.3.1 Multiples and sub-multiples of units 4 1.3.2 Letter symbols 4 1.3.3 Definitions 4 1.3.4 List of parameters useful for core characterization 4 1.4 Standard and preferred values 4 1.4.1 Dimensions of cores 4 1.4.2 Nominal value of inductance factor A L 4 1.5 Marking of core
18、s and packaging 4 1.6 Subcontracting 4 1.7 Validity of release 4 2 Quality assessment procedures 4 2.1 Qualification approval 5 2.1.1 Primary stage of manufacture 5 2.1.2 Qualification approval procedures 5 Page 2.1.3 Quality conformance inspection requirements 5 2.1.3.1 Delayed delivery 5 2.1.3.2 C
19、ertified test records 5 2.2 Capability Approval 5 2.2.1 General 5 2.2.1.1 Eligibility for capability approval 5 2.2.1.2 Primary stage of manufacture 5 2.2.1.3 Subcontracting 5 2.2.1.4 Incorporated components 6 2.2.1.5 Validity of release 6 2.2.1.6 Rework 6 2.2.2 Procedures for capability approval 6
20、2.2.2.1 Application for capability approval 6 2.2.2.2 Granting of capability approval 6 2.2.2.3 Description of capability 6 2.2.2.4 Capability Qualifying Components (CQCs) 6 2.2.2.4.1 Process description 8 2.2.2.4.2 Selection of CQCs vs process steps 10 2.2.2.5 Demonstration and verification of capa
21、bility 11 2.2.2.6 Procedures to be followed in the event of CQC failures 11 2.2.2.7 Abstract of description of capability 11 2.2.3 Procedures following the granting of capability approval 11 2.2.3.1 Maintenance of capability approval 11 2.2.3.2 Modifications likely to affect the validity of capabili
22、ty approval 11 2.2.4 Release for delivery 11 3 Test and measurement procedures (General guidance) 11 Figure 1 Powder production process 7 Figure 2 Core production process 8 Table 1 CQCs definitions 10 latest date by which the EN has to be implemented at national level by publication of an identical
23、national standard or by endorsement (dop) 1998-09-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 1998-09-01EN125000:1997 BSI 04-1999 3 1 General 1.1 Scope This Generic Specification is applicable to cores made of ferrite materials. These products ar
24、e used in a wide range of inductive components required for many applications in almost all industries. It establishes standard terms, inspection procedures and methods of testing for use in sectional and detail specifications within the CECC System for electronic components. 1.2 Normative reference
25、s This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these p
26、ublications apply to this European Standard only when incorporated in it by amendments or revision. For undated references the latest edition of the publication referred to applies. CECC 00 111, Rule of Procedure11: Specifications. CECC 00 114, Rule of Procedure14: Quality assessment procedures. CEC
27、C 00 200, Register of firms, products and services approved under the CECC System. CECC 00 400, Handbook for the production of CECC documents. EN 60068-2, Basic environmental testing procedures. EN 125500:1996, Magnetic oxide ring cores for interference suppression and low level signal transformer a
28、pplications. IEC 60027:1971, Letter symbols to be used in electrical technology. IEC 60050, International Electrotechnical Vocabulary (including the Advanced Edition of Section 901 on magnetic materials). IEC 60133:1985, Dimensions for pot-cores made of magnetic oxides and associated parts. IEC 6020
29、5:1966, Calculation of the effective parameters of magnetic piece parts (+A1:1976+A2:1981). IEC 60226:1967, Dimensions of cross-cores (X-cores) made of magnetic oxides and associated parts (+ A1:1982). IEC 60367-1, Cores for inductors and transformers for telecommunications Part1: Measuring Methods
30、(+ A1:1984 + A2:1992). IEC 60367-2, Cores for inductors and transformers for telecommunications Part 2: Guides for the drafting of performance specifications (+ A1:1983). IEC 60367-2A, Cores for inductors and transformers for telecommunications Part 2: Guides for the drafting of performance specific
31、ations First supplement. IEC 60401:1993, Ferrite materials Guide on the format at data appearing in manufacturers catalogues of transformer and inductor cores. IEC 60410:1973, Sampling plans and procedures for inspection by attributes. IEC 60424:1973, Guide to the specification of limits for physica
32、l imperfections of parts made from magnetic oxides. IEC 60431:1983, Dimensions of square cores (RM-cores) made of magnetic oxides and associated parts. IEC 60492:1974, Measuring method for aerial rods. IEC 60556:1982, Measuring methods for properties of gyromagnetic materials intended for applicatio
33、n at microwave frequencies. IEC 60617:1985, Graphical symbols for diagrams. IEC 60647:1979, Dimensions for magnetic oxide cores intended for use in power supplies (EC-cores). IEC 60701:1981, Axial lead cores made of magnetic oxide or iron powder. IEC 60723-1:1982, Inductor and transformer cores for
34、telecommunication. Part1: Generic specification. IEC 60732:1982, Measuring methods for cylinder cores, tube cores and screw cores of magnetic oxide. IEC 61185:1992, Magnetic oxide cores (ETD-cores) intended for use in power supply applications Dimensions. IEC 61246:1994, Magnetic oxide cores (E-core
35、s) of rectangular cross-section and associated parts Dimensions. IEC 61247:1994, PM-cores made of magnetic oxides, and associated parts Dimensions. IEC 61332:1995, Soft Ferrite material classification. IEC 61333:1996, Marking on U and E ferrite cores. IEC 61596:1995, Magnetic oxide EP-cores and asso
36、ciated parts for use in inductors and transformers Dimensions. ISO 497:1973, Guide to the choice of series of preferred numbers and of series containing more rounded values of preferred numbers. ISO 1000:1981, SI units and recommendations for the use of their multiples and of certain other units. EN
37、125000:1997 4 BSI 04-1999 ISO 2859-1:1989, Sampling procedures for inspection by attributes Part1: Sampling plans indexed by acceptable quality level (AQL) for lot by lot inspection. ISO 2859-2:1985, Sampling procedures for inspection by attributes Part2: Sampling plans indexed by limiting quality (
38、LQ) for isolated lot inspection. ISO 9000:1994, Quality and quality assurance standards Guidelines for selection and use. 1.3 Units, symbols and terminology Units, graphical symbols, letter symbols and terminology shall, whenever possible, be taken from the following documents: ISO 1000, SI units an
39、d recommendations for the use of their multiples and of certain other units. IEC 60027, Letter symbols to be used in electrical technology. IEC 60050, International Electrotechnical Vocabulary. Subclause1.3.1 and1.3.2 contain additional terminology and letter symbols applicable to inductor and trans
40、former cores. Subclause1.3.3 contains a definition of Capability Qualifying Components. Subclause 1.3.4 contains a list of parameters useful for core characterization. 1.3.1 Multiples and sub-multiples of units In accordance with IEC60367-2. 1.3.2 Letter symbols In accordance with IEC60367-2. 1.3.3
41、Definitions The term: Capability Qualifying Components (CQCs) stands for products being produced at given manufacturing process steps. 1.3.4 List of parameters useful for core characterization * Inductance factor A L In accordance with subclause 3.4.4 of IEC60367-2A A Lmeasured at low flux density (
42、corresponding to 4 ior 4 e ) A L1measured at high flux density (corresponding to 4 a ) A L2measured for DC-biasing field (corresponding to 4 rev ) * Loss factor tan$/4 i Loss at low flux density * Hysteresis material constant ) B * Power loss P Loss at high flux density * Inductance L Measured at a
43、given frequency * Temperature factor of permeability ! F In accordance with IEC60367-2A. * Disaccommodation factor D F In accordance with IEC 60367-2A. 1.4 Standard and preferred values 1.4.1 Dimensions of cores Cores shall preferably be in accordance with IEC and EN Publications, such as: 1.4.2 Nom
44、inal value of inductance factor A L Nominal values of the inductance factor should preferably be taken from the R5-series of ISO497. When other values have been used, these should be taken from another series in that standard. 1.5 Marking of cores and packaging The marking of the cores and the packa
45、ging should be in accordance with available relevant standards (e.g. IEC61333). 1.6 Subcontracting If subcontracting is invoked it shall be in accordance with the requirements of 1.2 CECC00114:RP14-II. 1.7 Validity of release Where applicable the validity of release shall be in accordance with 2.2.5
46、 CECC00111:RP11-III. 2 Quality assessment procedures This clause is divided in two parts: * QUALIFICATION APPROVAL Procedures described in subclause2.1. * CAPABILITY APPROVAL Procedures described in subclause2.2. Pot-cores : IEC 60133 Square cores (RM-cores) : IEC 60431 Toroids : EN 125500 EC-cores
47、: IEC 60647 ETD-cores : IEC 61185 E-cores : IEC 61246 PM-cores : IEC 61247 EP-cores : IEC 61596EN125000:1997 BSI 04-1999 5 2.1 Qualification approval 2.1.1 Primary stage of manufacture For the purpose of specifications for inductor and transformer cores made of ferrite materials, the primary stage i
48、s the final compacting of the powder into a solid form before thermal processing. 2.1.2 Qualification approval procedures To obtain qualification approval, the manufacturer shall produce test evidence of conformance to the specification requirements on three consecutive lots for lot-by-lot inspectio
49、n and on one lot for periodic inspection. Normal inspection shall be used, but where the sample size would give acceptance on zero defective, additional specimens shall be taken to meet the sample size required to give acceptance on one defective. Alternatively, a special sample may be drawn of cores of the same shape and size. This sample shall be subjected to all tests of Group A and shall then be subdivided for carrying out the subgroups of Groups B and C, each subgroup being carried out on a separate subsample. The su
