Part 4. Selecting Ideal Transducer Range,

INTRODUCTION: As we saw at the beginning of this series, the 1m rule had a range of 1m! This may seem to be a statement of the obvious but when dealing with transducers, their range is of paramount importance. Range is crucially important for two main reasons.

Firstly the resolution of the signal conditioning is a proportion of the range it is set to which is fixed by the A/D converter’s bit range. For 12 bit A/D the range is divided into about 4000 steps. Secondly, and just as importantly, the transducer accuracy is specified by the manufacturer as a percentage of full range e.g. 0.05% FRO is common for pressure transducers. Thus range is the key element, not only in the specification of transducers and measuring systems, but also how these specifications work out in practice. These practical outcomes are best illustrated with some examples. To download the complete white paper, click on the PDF link below.

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