《BS-9925-0-1984 IEC-60723-1-1982 QC-250000-1982.pdf》由会员分享，可在线阅读，更多相关《BS-9925-0-1984 IEC-60723-1-1982 QC-250000-1982.pdf（18页珍藏版）》请在三一文库上搜索。
1、BRITISH STANDARD BS 9925-0: 1984 IEC 723-1: 1982 QC 250000: 1982 Harmonized system of quality assessment for electronic components Inductor and transformer cores for telecommunications Part 0: Generic specification IEC title: Inductor and transformer cores for telecommunications Part 1: Generic spec
2、ification UDC 621.3.042.1:621.318.435:621.314.22:621.39 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:08:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9925-0:1984 This British Standard, having been prepared under the direction of the Electronic Component
3、s Standards Committee, was published under the authority of the Board of BSI and comes into effect on 28 September 1984 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference ECL/20 Draft for comment 78/27486 DC ISBN 0 580 14057 1 Committees responsible for
4、 this British Standard The preparation of this British Standard was entrusted by the Electronic Components Standards Committee (ECL/-) to Technical Committee ECL/20 upon which the following bodies were represented: Electronic Components Industry Federation Electronic Engineering Association Ministry
5、 of Defence National Supervising Inspectorate Telecommunication Engineering and Manufacturing Association (TEMA) Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:08:34 GMT+00:00 2006, Uncontroll
6、ed Copy, (c) BSI BS 9925-0:1984 BSI 01-2000i Contents Page Committees responsibleInside front cover National forewordii Section 1. Scope 1Scope1 Section 2. General 2Document system1 3Units, symbols and terminology2 4Standard and preferred values2 5Effective parameters2 Section 3. Quality assessment
7、procedures 6Primary stage of manufacture2 7Sampling procedure3 8Inspection for qualification approval3 9Quality conformance inspection3 10Delayed delivery3 11Certified records of released lots4 Section 4. Tests and measuring methods 12Visual examination and dimensions4 13Electrical tests and measuri
8、ng methods4 14Mechanical tests6 Section 5. Blank detail specifications 15General7 16Identification of the detail specification7 17Identification of the core7 18Supplementary information7 19Test schedule7 Appendix A Format for the first page of detail specifications8 Appendix B Format for the test sc
9、hedule9 Publications referred toInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:08:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9925-0:1984 ii BSI 01-2000 National foreword This Part of this British Standard has been prepared under the d
10、irection of the Electronic Components Standards Committee. It is identical with IEC Publication 723-1 (QC 250000) “Inductor and transformer cores for telecommunications Part 1: Generic specification”, published in 1982 by the International Electrotechnical Commission (IEC). This standard is a harmon
11、ized specification within the IECQ system of quality assessment for electronic components. Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not ident
12、ical with those used in British Standards. Cross-references. The British Standard harmonized with QC 001001 and QC 001002 is BS 9000 “General requirements for a system for electronic components of assessed quality” Part 1:1981 “Specification of basic rules and procedures”. NOTEIEC 367-1:1971 has bee
13、n superseded by the 1982 second edition which contains additional test methods for (effective) amplitude permeability and magnetic properties under pulse conditions. International StandardsCorresponding British Standards ISO 3:1973BS 2045:1965 Preferred numbers ISO 497:1973(Technically equivalent) I
14、SO 1000:1981BS 5555:1981 Specification for SI units and recommendations for the use of their multiples and of certain other units (Identical) IEC 50(901):1973BS 4727 Glossary of electrotechnical, power, telecommunication, electronics, lighting and colour terms Part 1 Terms common to power, telecommu
15、nication and electronics Group 07:1973 Magnetism terminology (Technically equivalent) IEC 68-1:1982BS 2011 Basic environmental testing procedures Part 1.1:1983 General and guidance (Identical) IEC 205:1966 plus supplements 205A (1968) and 205B (1974) BS 6454:1983 Method for calculation of the effect
16、ive parameters of magnetic piece parts (Identical) BS 5938 Cores for inductors and transformers for telecommunications IEC 367-1:1971 plus supplements 367-1A (1973) 367-1B (1973) 367-1C (1974) 367-1D (1977) Part 1:1980 Methods of measurement (Identical) IEC 367-2:1972 plus supplement 367-2A (1976) P
17、art 2:1980 Guide to the drafting of performance specifications (Identical) IEC 410:1973BS 6001:1972 Sampling procedures and tables for inspection by attributes (Technically equivalent) Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:08:34 GMT+00:00 2006, Unco
18、ntrolled Copy, (c) BSI BS 9925-0:1984 BSI 01-2000iii At present there are no corresponding British Standards for the following IEC Publications referred to in the text. IEC 27, IEC 117, IEC 133:1967, IEC 226:1967, IEC 424:1973, IEC 431:1983, IEC 525:1976, and also IEC 367-1:1982 (see note above). Th
19、e Technical Committee has reviewed the provisions of these IEC Publications and has decided that they are acceptable for use in conjunction with this standard. A related British Standard for IEC 117 is BS 3939 “Graphical symbols for electrical power, telecommunications and electronics diagrams”. (It
20、 should be noted that IEC 117 has been superseded by IEC 617.) A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity fr
21、om legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 10, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendm
22、ent table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:08:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:08:34 GMT+00:00 2006, Uncon
23、trolled Copy, (c) BSI BS 9925-0:1984 BSI 01-20001 Section 1. Scope 1 Scope This generic specification lists the procedures to be used in the quality assessment of inductor and transformer cores for telecommunications, and the tests and measuring methods which may be selected by the appropriate secti
24、onal and blank detail specifications for these components. This specification prescribes the rules for writing blank detail specifications, and also gives the relevant units, symbols and terminology. The components which are the subject of this specification are magnetic cores, mainly made of magnet
25、ic oxides or metallic powders, used in linear inductors and transformers for telecommunication equipment and electronic equipment employing similar techniques. Further information on the test methods, the conditions under which they should be carried out and the precautions which should be observed
26、in their use, are given in IEC Publication 367-1. Section 2. General 2 Document system 2.1 Order of precedence Where any discrepancies occur for any reasons, documents shall rank in the following order of authority: the detail specification; the sectional specification; the generic specification; th
27、e basic specifications and other documents to which reference is made. The same order of precedence shall apply to equivalent national documents. 2.2 Related documents IEC Publications: Publications Nos. 27:Letter Symbols to be Used in Electrical Technology. 50:International Electrotechnical Vocabul
28、ary (incl. Chapter 901: Magnetism). 68-1:Basic Environmental Testing Procedures. Part 1: General. 117:Recommended Graphical Symbols. 133:Dimensions for Pot-cores Made of Ferromagnetic Oxides and Associated Parts. 205:Calculation of the Effective Parameters of Magnetic Piece Parts. 226:Dimensions of
29、Cross Cores (X-cores) Made of Ferromagnetic Oxides and Associated Parts. 367-1:Cores for Inductors and Transformers for Telecommunications, Part 1: Measuring Methods. 367-2:Part 2: Guides for the Drafting of Performance Specifications. 367-2A: First supplement to Publication 367-2 (1974). 410:Sampli
30、ng Plans and Procedures for Inspection by Attributes. 424:Guide to the Specification of Limits for Physical Imperfections of Parts made from Magnetic Oxides. 431:Dimensions of Square Cores (RM-cores) Made of Magnetic Oxides and Associated Parts. 525:Dimensions of Toroids Made of Magnetic Oxides or I
31、ron Powder. QC 001001 (1981):Basic Rules of the IEC Quality Assessment System for Electronic Components (IECQ). QC 001002 (1981):Rules of Procedure of the IEC Quality Assessment System for Electronic Components (IECQ). Sections 1 and 2. Licensed Copy: London South Bank University, London South Bank
32、University, Fri Dec 08 02:08:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9925-0:1984 2 BSI 01-2000 ISO publications: 3 Units, symbols and terminology 3.1 General Units, graphical symbols, letter symbols and terminology shall, whenever possible, be taken from the following documents: IEC Publica
33、tion27; IEC Publication50; IEC Publication 117; ISO Standard 1000. IEC Publications 367-1 and 367-2 contain additional terminology and letter symbols applicable to inductor and transformer cores. 3.2 Multiples and sub-multiples of units Equations are given for coherent SI units only. In detail speci
34、fications, multiples and submultiples will normally be used as given in Note 4 to Clause 2 of IEC Publication 367-2. The standard symbols for quantities used in the equations are defined in Note 5 to Clause 2 of IEC Publication 367-2. 4 Standard and preferred values 4.1 Dimensions The dimensions of
35、inductor and transformer cores shall be in accordance with IEC publications. Where the detail specification makes reference to the relevant IEC publication, it shall mention the issue number and year and any valid amendments and supplements. 4.2 Inductance factor For cores with an air-gap, the nomin
36、al value of the inductance factor shall be numerically equal to one of the terms in a series specified in ISO Standard 497. NOTEThe R5 series of ISO Standard 497 is preferred. For cores with a separable adjusting device, the nominal value applies when the adjustor has been removed. For cores with in
37、separable adjusting devices, the minimum value of the inductance factor shall be taken as the nominal value. 5 Effective parameters At least two of the five effective parameters and core factors as defined in IEC Publication 205 shall be given for each core in its detail specification. The values of
38、 effective parameters to be used for quality assessment shall be those appended to the dimensional standard for the appropriate core type. NOTEThe manufacturers may indicate in their catalogues more precise values than those indicated in the relevant detail specification: these should be within the
39、minimum and maximum limits which can be derived from the dimensions specified therein. Section 3. Quality assessment procedures 6 Primary stage of manufacture For the purpose of specifications for inductor and transformer cores made of magnetic oxides or of metallic powders, the primary stage is the
40、 final compacting of the powder into a solid form before sintering. ISO Standards 3:Preferred numbers Series of preferred numbers. 497:Guide to the choice of series of preferred numbers and of series containing more rounded values of preferred numbers. 1000:SI units and recommendations for the use o
41、f their multiples and of certain other units. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:08:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9925-0:1984 BSI 01-20003 7 Sampling procedure When use is made of IEC Publication 410 for attribute testing, the
42、unit of product is as stated in the relevant test method or in the detail specification. Unless otherwise specified, the Acceptable Quality Level (AQL) shall refer to the percentage of defectives. 8 Inspection for qualification approval To obtain qualification approval, the manufacturer shall produc
43、e test evidence of conformance to the requirements of the detail specification on three consecutive lots for lot-by-lot inspection and on one lot for periodic inspection. Normal inspection shall be used: for lot-by-lot inspection, a sampling plan with an acceptance number of not less than 1 shall be
44、 used. Alternatively, a special sample may be drawn of cores of the same shape, size and material. This sample shall be subjected to all the tests in Group 0 of the qualification test schedule given in the detail specification. It shall then be split up into sub-samples as indicated in the sectional
45、 specification, each sub-sample being subjected to one of the other groups of the qualification test schedule. 9 Quality conformance inspection The detail specification shall prescribe the tests to be carried out on each inspection lot and those to be carried out for periodic inspection, in accordan
46、ce with the rules of the appropriate sectional specification. For continuous production of cores, an inspection lot is defined as all cores of the same shape and size, produced from one batch of material powder, pressed and sintered using essentially the same process and irrespective of the inductan
47、ce factor of the finished product. The last manufacturing stage of the lot shall be carried out within a stated period, which should normally not exceed one week. The samples drawn from such an inspection lot shall contain proportional parts of each inductance factor where this can have an influence
48、 on the test result. Alternatively, when the cores are placed in an intermediate store before grinding of the air-gap, the above lot definition is valid up to that stage. For the remaining manufacturing stages, cores of similar shape and size but from different inspection lots before storing, may be
49、 aggregated into one inspection lot after the final manufacturing stages on condition that: the core lots were released against the detail specification requirements appropriate to the cores in the ungapped stage before placing them in the intermediate store; all cores were pressed and sintered using essentially the same process; the final manufacturing stage has taken place within a given period for an inspection lot, which should normally not exceed one week; both the original (before intermediate storing) and the final inspection lots can be t