How to reduce noise for analogue measurements?
Any measurements will contain a certain amount of unwanted noise. The ability for a monitoring system to function in the face of noise will depend directly on the signal-to-noise ratio required for the particular application. Most noise incurred problems can be overcome by proper installation of the project cabling. Often noise problems can reduced by applying suitable grounding and shielding principles. A common error discovered in data acquisition systems is to assume that the signal ground and return lines are the same. This often leads to multiple ground links at separate points causing earth currents to flow due to the different parts of the system. The earth currents can be a major contributor to overall system noise. All the equipment connected within a system should all be terminated to one central earth point. The return path for signals to ground should have as low an impedance as possible to reduce the effects of EMI. The use of proper signal wiring to connect the various tr
