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Calibration. Part 2: Polynomial Curve Fitting, article 2013 year from the Circuit Cellar magazine.

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Calibration. Part 2: Polynomial Curve Fitting by David Cass Tyler. ABSTRACT: The first part of this article series introduced linear calibration and recalibration of A/D conversion readings. It described how to convert A/D readings to real-world engineering unit values. The article also explained how to convert back from those values to the equivalent A/D readings. This article presents a method for fitting a polynomial curve to nonlinear data to perform nonlinear conversions. It also outlines an approach that converts back from the engineering units to the A/D readings.

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