Although unconnected physically, nearby conductors are coupled electrically by the capacitance between them (in the same way that the parallel plates of a capacitor are coupled). Thus a voltage change occurring in one conductor is coupled to other conductors nearby. The amount of capacitance (see Chapter 11) between the conductors determines the degree of coupling between them.
In measurement systems, the objects of capacitive interference are the low-level signal transducers and low-level signal-carrying conductors. The sources of capacitive