©Sealevel Systems, Inc.
SL9049 - 06/2011
SeaI/O Manual
101
A floating, non-referenced 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, and opto-
isolator outputs. To measure these devices the ground reference point must be connected to
the analog ground reference of the SeaI/O-570 as shown in the above schematic. Without this
connection, the signals will float and an accurate measurement is not possible. The SeaI/O-570
is configured to measure floating, non-referenced signals by default.