Non-connected analog inputs should always be connected to the analog ground or common reference terminal. This eliminates phantom readings on all unused analog inputs. When an unused analog input is not connected to a reference voltage source, the high-impedance…

A floating signal source is a signal that is not connected in any fashion to the building ground system but rather has an isolated ground reference point. Examples of floating signal sources are outputs of transformers, thermistors, battery-powered devices…

We recommend using a SeaI/O-570 module, which has eight 16-bit A/D inputs that are capable of measuring floating, or non-referenced, analog signals. For instructions and schematics for interfacing a SeaI/O-570 module to floating analog signals, read the Floating…