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Resistance Temperature Detector (RTD). An RTD sensing element usually consists of a metal filament, which is coiled on a mandrel or etched on a substrate. The RTD element is made from a pure material, typically platinum, nickel or copper. The material has a predictable change in resistance as the temperature changes; it is this predictable change that is used to determine temperature.

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Sallen-Key filter for PT100 RTD measurement

I refer my work to Microchip note AN687 Precision Temperature-Sensing With RTD Circuits. On the page 4 is shown circuit I want to build: I am beginner. …
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