FOXBORO P0902YU Digital input module

) If the dimensions of a metallic sheet increase extensively (as in the case of a conducting subfloor), the characteristic impedance approaches a very low value. In this case, even if the signal equipotential plane were improperly terminated to the earth electrode subsystem, the impedance would be quite low throughout a large portion of the spectrum. This, in turn, would establish an equipotential reference plane for all equipment bonded to it. With this reference plane bonded to earth, the following advantages are obtained. (a) Any "noisy" cable or conductor connected to the receptor through or along such a ground plane will have its electric field contained between the conductor and the ground plane. The noise field can be "shorted out" by filters and bond straps because the distance between these “transmission line” conductors is very small.

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