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BC54-10PA Datasheet(PDF) 7 Page - EPCOS |
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BC54-10PA Datasheet(HTML) 7 Page - EPCOS |
7 / 22 page 15 04/00 Disturbed equipment Electrical devices, equipment and/or systems subject to interference and which can be adversely affected by it are termed disturbed equipment. In the same way as interference sources, disturbed equipment can also be categorized correspond- ing to frequency characteristics. A distinction can be made between narrowband and broadband susceptibility (fig. 6). Narrowband systems include radio and TV sets, for example, whereas data processing systems are generally specified as broadband systems. Fig. 6 Disturbed equipment 2.3 Propagation of electromagnetic interference and EMC measurement techniques As previously mentioned, an interference source causes both conducted and radiated electro- magnetic interference. Propagation along lines can be detected by measuring the interference current and the interference voltage (fig. 7). The effect of magnetic and electric interference fields on their immediate vicinity is assessed by measuring the radiated magnetic and electric field components. This method of propagation is also frequently termed electric or magnetic coupling (near field). In higher frequency ranges, characterized by the fact that device dimensions are in the order of magnitude of the wavelength under consideration, the interference energy is mainly radiated direct- ly (far field). Conducted and radiated propagation must also be taken into consideration when measuring the susceptibility of disturbed equipment. Interference sources e.g. sine-wave generators as well as pulse generators with a wide variety of pulse shapes are used for such tests. Radio and TV receivers Digital and analog systems Radio reception equipment Data processing systems Modems Process control computers Data transmission systems Control systems Telemetric radio transmission devices Video transmission systems Frequency-coded signalling equipment Interface lines Disturbed equipment (affected by EMI) Narrowband susceptibility Broadband susceptibility General Technical Information |
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