Ovation 1C31174G03 Digital input card

The first step in the development of an interference-free signal reference subsystem for an equipment or a facility is to assure that the ac primary power neutral or grounded conductor are interconnected with the safety grounding network at only one point. Isolation of ac power returns from the signal reference subsystem is a major factor toward reducing many noise problems. Additional steps should also be taken to minimize other stray ac currents such as those resulting from power line filters. One way of reducing these currents is to limit the number of filter capacitors in an installation by using common filtered ac lines wherever possible or by locating the filters as near as possible to the power service entry of the facility.

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