The ultimate purpose of the
\(R\left(T\right)\) calibration is to be able to determine the temperature from a measurement of the thermometer resistance. Rather than carry out a second Chebyshev fit for
\(T\left(R\right)\) — which can lead to inconsistencies in the handling of the data — we instead find the value of
\(T\) for which our calibration calculates a value of
\(R\) corresponding to the measured
\(R\) value by use of the
Chebyshev.roots()
root finding routine built into
Chebyshev_fit
.