IEC 61000-4-3:2020 pdf free download – Electromagnetic compatibility (EMC)
1 Scope
This part of lEC 61000 is applicable to the immunity requirements of electrical and electronicequipment to radiated electromagnetic energy. lt establishes test levels and the required testprocedures.
The object of this document is to establish a common reference for evaluating the immunity ofelectrical andelectronicequipment when subjected to radiated,radio-frequencyelectromagnetic fields. The test method documented in this part of lEC 61000 describes aconsistent method to assess the immunity of an equipment or system against RFelectromagnetic fields from RF sources not in close proximity to the EUT.The test environmentis specified in Clause 6.
NOTE1 As described in lEC Guide 107, this is a basic EMC publication for use by product committees of the lEC.As also stated in Guide 107, the lEC product committees are responsible for determining whether this immunity teststandard should be applied or not, and if applied, they are responsible for determining the appropriate test levelsand performance criteria. TC 77 and its sub-committees are prepared to co-operate with product committees in theevaluation of the value of particular immunity tests for their products.
NOTE 2 lmmunity testing against RF sources in close proximity to the EUT is defined in lEC 61000-4-39.
Particular considerations are devoted to the protection against radio-frequency emissions fromdigital radiotelephones and other RF emitting devices.
NOTE 3 Test methods are defined in this part for evaluating the effect that electromagnetic radiation has on theequipment concerned. The simulation and measurement of electromagnetic radiation is not adequately exact forquantitative determination of effects. The test methods defined in this basic document have the primary objective ofestablishing an adequate reproducibility of testing configuration and repeatability of test results at various testfacilities.
This document is an independent test method. lt is not possible to use other test methods assubstitutes for claiming compliance with this document.
2Normative references
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references, only the edition cited applies.For undated references,the latest edition of the referenced document (including anyamendments) applies.
IEC 60050-161，International Electrotechnical Vocabulary (IEV) – Part 161: Electromagneticcompatibility (available at www.electropedia.org)
4General
Electronic equipment can，in some manner,be affected by electromagnetic radiation.Thisradiation is frequently generated by various sources, such as small hand-held radio transceivers,fixed-station radio and television transmitters，vehicle radio transmitters and industrialelectromagnetic sources.Many of these services use modulation techniques with a non-constant envelope.
ln addition to electromagnetic energy deliberately generated, there is also radiation caused bythe operation of devices such as welders，thyristors，fluorescent lights，switches operatinginductive loads,etc. Conducted electrical interference is dealt with in other parts of theIEC 61000-4 series. Methods employed to prevent effects from electromagnetic fields willnormally also reduce the effects from these sources.
In this document,the electromagnetic environment is characterized by the strength of theelectromagnetic field. The field strength is not easily measured without sophisticatedinstrumentation nor is it easily calculated by classical equations and formulas because of theeffect of surrounding structures or the proximity of other equipment that will distort and/or reflectthe electromagnetic waves.