![]() ![]() The source of functional harassment refers to the harassment of other systems, such as the harassment caused by radio stations, industry, science, medical equipment, etc., while a system is working normally.ī. The transient disturbance source is the electromagnetic disturbance source with short action time and non-periodic disturbance.Ĥ) According to the function and non-functionality of electromagnetic disturbance source: it is divided into functional disturbance source and non-functional disturbance source.Ī. The intermittent disturbance source is a short-term electromagnetic disturbance source Ĭ. The continuous disturbance source is a long-term electromagnetic disturbance source ī. Industrial, scientific and medical equipment (ISM), vehicles, motor boats and spark ignition engine units, household appliances, portable power tools and similar appliances, fluorescent lamps and lighting fixtures, and information technology equipment are major sources of transient disturbances.Ģ) According to the nature of electromagnetic disturbance source: divided into two types: pulse disturbance source and smooth disturbance source.ģ) According to the action time of electromagnetic disturbance source, it can be divided into continuous disturbance source, intermittent disturbance source and transient disturbance source.Ī. Man-made disturbances can be divided into two categories: radio disturbances and non-radio disturbances.Ĭ. ![]() Man-made disturbance sources are characterized by being known and controllable. According to their different causes and physical properties, natural disturbance sources can be divided into four categories: electronic noise, sky-electric noise, extraterrestrial noise, and sedimentary static electricity.ī. Natural disturbance sources are characterized by their uncontrollability. Obviously, the larger the effective area of the antenna is, the stronger the ability of sensitive equipment to receive electromagnetic disturbance.Ĭlassification of electromagnetic disturbance sourcesġ) According to the classification of electromagnetic disturbance sources: it can be divided into three categories: natural disturbance sources, man-made disturbance sources and transient disturbance sources.Ī. This is a parameter that characterizes the ability of sensitive equipment to receive disturbance field strength. The parameters describing this radiation ability or receiving ability are called directional characteristics. The disturbance source radiates electromagnetic disturbance in all directions of space, or the ability of sensitive equipment to receive electromagnetic disturbance from all directions is different. When the polarization characteristics of the disturbance source antenna and the antenna of the sensitive equipment are the same, the induced voltage generated by the radiated disturbance at the input end of the sensitive equipment is the strongest.Ħ) Directional characteristics of radiation disturbance Polarization characteristics refer to the time-varying characteristics of the direction of the disturbance field strength vector at a given point in space, which depends on the polarization characteristics of the antenna. According to the occurrence rate of electromagnetic disturbance, it can be divided into three types: periodic disturbance, non-periodic disturbance and random disturbance.ĥ) Polarization Characteristics of Radiated Disturbance The distribution of electromagnetic disturbance field strength or power over time is related to the occurrence rate of electromagnetic disturbance. Waveform is an important factor in determining the frequency width of electromagnetic disturbance. In the continuous wave disturbance, the frequency spectrum width of the hum disturbance is the narrowest, and in the impulse disturbance, the frequency spectrum width of the unit impulse function is the widest.Įlectromagnetic disturbances have various waveforms. Three elements of electromagnetic compatibilityĮlectromagnetic energy emitted by any form of natural or electrical device can cause harm to people or other creatures sharing the same environment, or cause electromagnetic hazards to other equipment, subsystems or systems, resulting in performance degradation or failure, which is called electromagnetic harassment source.Ĭharacteristics of electromagnetic disturbance sourcesġ) The emission level under the condition of the specified bandwidthĪccording to the frequency distribution characteristics of electromagnetic disturbance energy, its spectral width can be determined. ![]()
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