Floating the data acquisition chains to improve the quality of measurements.
Guarding sensors and measuring equipment is a smart operation which decouples the apparatus or systems from common mode electrical disturbances. In this context, the floating techniques are revisited and the usual measurement problem in noisy environment is outlined. It is shown that the use of differential inputs to pickup sensor continuous signals, as well as simple shielding and grounding techniques lead to increase the quality of data acquisition systems. At the other size, optical couplers allow to pass the digital version of data to an external bus or to a network by preserving the apparatus floating features.
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IUT Dépt GE, Université d'Evry-Val-d'Essonne, Evry, France.