IEC (1982)-Publication 367-1 (1982) Cores for Inductors and Transformers, Part 1.-Measuring Methods. IEC (1989)-Documents published by Bureau Centrale de la Commission Electrotechnique Internationale, 3, rue de Varembe, Geneva, Switzerland. This process is experimental and the keywords may be updated as the learning algorithm improves.įoner, S.

These keywords were added by machine and not by the authors. In addition, there is a very helpful User’s Guide to Soft Ferrites, MMPA-SFG96 (MMPA 1996) published by the Magnetic Materials Producers Association. Lists of documents of the BEC and ASTM for metallic and ferrite materials appear in Table 32.2 at the end of this chapter. Foremost is the TC51 Committee of the EC (International Electrotechnical Commission ) (IEC,1989) headquartered in Switzerland. There are trade associations and standards groups that provide assistance in standardization of ferrite measurements. To add to the number of measurements to be made is the fact that, due to variations, known or unknown, in raw materials, processing conditions and firing conditions, ferrite cores depend on frequent magnetic in-process testing to provide process feedback. For example, for soft magnetic ferrite, Table 23.1 gives a listing of some of the requirements that may exist for a particular core. In addition, the users of ferrites have put together a combination of what would seem to the ferrite producers a very large number of requirements which must be met in the same material or on the same component. While some of the requirements for ferrites are similar to those used for other magnetic materials, many such as disaccomodation are unique to ferrites. or low frequency methods are used but since ferrites are primarily high frequency materials, measurements at the higher frequencies are more common. Proper evaluation of ferrite materials and components requires the use of many different magnetic and electrical measurement techniques. Although this chapter deals mainly with magnetic measurements on ferrites, the same techniques with some adjustment for frequency may be used for other materials.

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