BENTLY 3500/53 Overspeed detection module

Filters. The majority of interfering signals, even if they are free-space coupled to the signal and power lines, are conductively coupled into the susceptible circuit. The proper application of filters to both the signal and power lines can reduce this coupling. (1) It is essential to avoid signal penetration via power and signal wiring. This demands that filters achieving adequate insertion loss be installed in all incoming cables; it is fairly normal to have threephase power circuits and several hundred signal lines going into a large enclosure. It is essential that the filters provide the specified attenuation under full-load conditions at all frequencies. Unless the filter attenuation is maintained at all frequencies and load currents, the overall shield attenuation will be degraded by the signal penetration via the filters.

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