IEC 60938-1:2021 pdf download

IEC 60938-1:2021 pdf download.Fixed inductors for electromagnetic interference suppression – Part 1: Generic specification
1 Scope
This part of IEC 60938 applies to inductors designed for electromagnetic interference suppression intended for use within all kind of electric and electronic equipment. In this generic specification, normative references and terms and definitions are given. It also prescribes general requirements and the suitable test and measurement procedures for interference suppression inductors. Annex B states special requirements for earth inductors.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. CISPR 17, Methods of measurement of the suppression characteristics of passive EMC filtering devices IEC 60027 (all parts), Letter symbols to be used in electrical technology IEC 60050 (all parts), International Electrotechnical Vocabulary (IEV) (available at www.electropedia.org) IEC 60060-1, High-voltage test techniques – Part 1: General definitions and test requirements IEC 60062, Marking codes for resistors and capacitors IEC 60068-1, Environmental testing – Part 1: General and guidance IEC 60068-2-1, Environmental testing – Part 2-1: Tests – Tests A: Cold IEC 60068-2-2, Environmental testing – Part 2-2: Tests – Tests B: Dry Heat IEC 60068-2-6, Environmental testing – Part 2-6: Tests – Test Fc: Vibration (sinusoidal) IEC 60068-2-13, Environmental testing – Part 2-13: Tests – Test M: Low air pressure IEC 60068-2-14, Environmental testing – Part 2-14: Tests – Test N: Change of temperature IEC 60068-2-17, Basic environmental testing procedures – Part 2-17: Tests – Test Q: Sealing IEC 60068-2-20, Environmental testing – Part 2-20: Tests – Test T: Test methods for solderability and resistance to soldering heat of devices with leads
3 Terms, definitions and conventions
3.1 Terms and definitions 3.1.1 choke inductor construction that employs one or more windings for a frequency-dependent impedance3.1.2 rated voltage U R maximum RMS operating voltage of the rated frequency or the maximum DC operating voltage that can be applied continuously to the terminations of the inductor Note 1 to entry: Because the rated voltage against any surrounding conducting surface is defined by the mounting in the application, an inductor with only one winding can have no rated voltage. 3.1.3 lower category temperature minimum surface temperature for which the inductor has been designed to operate continuously 3.1.4 upper category temperature T c maximum surface temperature for which the inductor has been designed to operate continuously 3.1.5 rated temperature T r maximum ambient temperature at which an inductor can carry its rated current 3.1.6 rated current I r maximum RMS operating current at rated frequency or maximum DC operating current, which allows continuous operation of the inductor at the rated temperature 3.1.7 nominal inductance L n inductance value for which the inductor has been designed and which is usually indicated upon it 3.1.8 insertion loss ratio of a voltage before and after the insertion of the suppressor in the circuit as measured in accordance with CISPR 17 3.1.9 insulated inductor inductor in which all live parts, except for the terminations, are protected against touch or contact with surrounding conductive parts 3.1.10 uninsulated inductor inductor in which at least one live metal part, other than a termination, is not protected against touch or contact with surrounding conductive parts 3.1.11 common-mode inductor current-compensated choke inductor having more than one winding on a single core arranged in such a way that the resultant magnetization caused by the symmetrical current is near zero3.1.12 earth inductor inductor connected in series with the protective conductor of equipment 3.1.13 power line choke mains inductor inductor intended for direct electrical connection to the supply mains 3.1.14 clearance shortest distance in air between two conductive parts or between a conductive part and a touchable surface 3.1.15 creepage shortest distance between two conductive parts or between a conductive part and a touchable surface, measured over the surface of the insulator 3.1.16 micro-environment conditions that immediately surround the clearance or creepage distance under consideration 3.1.17 pollution degree level of pollution present at the location on or in a product where the clearance and creepage measurement is made