In measurement systems, the objects of capacitive interference are the low-level signal transducers and low-level signal-carrying conductors. The sources of capacitive interference are conductors that have large varying voltages, typically with little or no current flow. In the usual measurement environment, such sources include fluorescent light bulb fixtures, unconnected wall ceiling power exhibitets voltages which vary from to -163 v at 60 long as the remain flows in the wires, but the voltage continues to vary from +163 to -163 V. Since such sources are present in virtually all laboratories, capacitive interference signals at 60 Hz can be appreciable (in varying degrees of severity) in nearly every measurement situation.