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clarify three stage pot div

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Robin Clark 2010-06-04 12:23:14 +01:00
parent 54dc5237d7
commit 05dd07ce83
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pt100/pt100.tex
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@ -52,7 +52,9 @@ look-up tables or a suitable polynomial expression.
\end{figure} \end{figure}
The voltage ranges we expect from this three stage potential divider The voltage ranges we expect from this three stage potential divider\footnote{
two stages are required for validation, a third stage is used to measure the current flowing
through the circuit to obtain accurate temperature readings}
are shown in figure \ref{fig:pt100vrange}. Note that there is are shown in figure \ref{fig:pt100vrange}. Note that there is
an expected range for each reading, for a given temperature span. an expected range for each reading, for a given temperature span.
Note that the low reading goes down as temperature increases, and the higher reading goes up. Note that the low reading goes down as temperature increases, and the higher reading goes up.