FOXBORO P0970EJ-DNBX Card system module

Large common reference planes. At the equipment level, the individual signal reference planes for the various networks must be connected together to prevent personnel shock hazards and to provide as near as possible, the same signal reference for all networks. Thus, the signal reference plane may extend over large distances within a facility. The assumption that this large reference plane provides zero impedance paths is not valid; the series inductance and resistance of the conductors forming the signal reference plane and the shunt capacitance to nearby conductive objects must be considered. Currents flowing in the signal reference plane will develop voltages across this impedance and will produce electric and magnetic fields around the conductors.

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