ref to voltage divider

pt100/pt100.tex

@@ -52,8 +52,6 @@ look-up tables or a suitable polynomial expression.
 \end{figure}
 
 
-
-
 The voltage ranges we expect from this three stage potential divider
 are shown in figure \ref{fig:pt100vrange}. Note that there is
 an expected range for each reading, for a given temperature span.
@@ -155,52 +153,15 @@ on the effects of each test case are found in section \ref{pt100range}
 and \ref{pt100temp}. 
 
 
-\pagebreak
-% \subsection{Single Fault Modes as PLD}
-% 
-% The component~failure~modes in table \ref{ptfmea} can be represented as contours 
-% on a PLD diagram. Each test case, or analysis into the effects of the component failure
-% caused by the component~failure is represented by an labelled asterisk.
-% 
-% 
-% \begin{figure}[h]
-%  \centering
-%  \includegraphics[width=400pt,bb=0 0 518 365,keepaspectratio=true]{./pt100/pt100_tc.jpg}
-%  % pt100_tc.jpg: 518x365 pixel, 72dpi, 18.27x12.88 cm, bb=0 0 518 365
-%  \caption{PT100 Component Failure Modes}
-%  \label{fig:pt100_tc}
-% \end{figure}
-% 
-% This circuit supplies two results, sense+ and sense- voltage readings.
-% To establish the valid voltage ranges for these, and knowing our
-% valid tempperature range for this example ({0\oc} .. {300\oc}) we can calculate
-% valid voltage reading ranges by using the standard voltage divider equation \ref{eqn:vd}
-% for the circuit shown in figure \ref{fig:vd}.
-
-
-\begin{figure}[h]
- \centering
- \includegraphics[width=100pt,bb=0 0 183 170,keepaspectratio=true]{./pt100/voltage_divider.png}
- % voltage_divider.png: 183x170 pixel, 72dpi, 6.46x6.00 cm, bb=0 0 183 170
- \caption{Voltage Divider}
- \label{fig:vd}
-\end{figure}
-%The looking at figure \ref{fig:vd} the standard voltage divider formula (equation \ref{eqn:vd}) is used.
-
-\begin{equation}
-\label{eqn:vd}
- V_{out} = V_{in}.\frac{Z2}{Z2+Z1}
-\end{equation}
-
 
 \subsection{Range and PT100 Calculations}
 \label{pt100temp}
 PT100 resistors are designed to 
-have a resistance of \ohms{100}  at 0 \oc \cite{eurothermtables}.
+have a resistance of \ohms{100}  at {0\oc} \cite{aoe},\cite{eurothermtables}.
 A suitable `wider than to be expected range' was considered to be {0\oc} to {300\oc}
 for a given application. 
 According to the Eurotherm PT100
-tables \cite{eurothermtables}, this corresponded to the resistances \ohms{60.28}
+tables \cite{eurothermtables}, this corresponded to the resistances \ohms{100}
 and \ohms{212.02} respectively. From this the potential divider circuit can be
 analysed and the maximum and minimum acceptable voltages determined.
 These can be used as bounds results to apply the findings from the 
@@ -246,48 +207,6 @@ Table \ref{ptbounds} gives ranges that determine correct operation. In fact it c
 for any single error (short or opening of any resistor) this bounds check
 will detect it.
 
-%\vbox{
-%\subsubsection{Calculating Bounds: High Value : HP48 RPL}
-%
-%
-%HP RPL calculator program to take pt100 resistance
-%and convert to voltage and {\adctw} values.
-%
-%\begin{verbatim}
-%<< -> p 
-%        <<
-%            p 2200 + 2200 2200 + p + / 5 * DUP 5
-%            / 4096 *
-%        >>
-%>>
-%\end{verbatim}
-%}
-%
-%\vbox{
-%\subsubsection{Calculating Bounds: LOW Value : HP48 RPL}
-%
-%
-%HP RPL calculator program to take pt100 resistance
-%and convert to voltage and {\adctw} values.
-%
-%\begin{verbatim}
-%<< -> p 
-%        <<
-%            p 2200 2200  p 2200 + + / 5 * DUP 5
-%            / 4096 *
-%        >>
-%>>
-%\end{verbatim}
-%}
-%
-%\subsection{Implementation of Four Wire Circuit}
-%
-%A standard 4 wire PT100\cite[pp 992]{aoe} circuit is read by 
-%ports on the 12 bit ADC of the PIC18F2523\cite{pic18f2523}.
-%Three readings are taken. A reading to confirm the voltage level
-%over $R_2$ is taken,
-%from which the current can be determined.
-%The two sense lines then give the vo
 
 \section{Single Fault FMEA Analysis of PT100 Four wire circuit}
 
@@ -312,7 +231,22 @@ This circuit supplies two results, sense+ and sense- voltage readings.
 To establish the valid voltage ranges for these, and knowing our
 valid temperature range for this example ({0\oc} .. {300\oc}) we can calculate
 valid voltage reading ranges by using the standard voltage divider equation \ref{eqn:vd}
-for the circuit shown in .
+for the circuit shown in figure \ref{fig:vd}.
+
+
+\begin{figure}[h]
+ \centering
+ \includegraphics[width=100pt,bb=0 0 183 170,keepaspectratio=true]{./pt100/voltage_divider.png}
+ % voltage_divider.png: 183x170 pixel, 72dpi, 6.46x6.00 cm, bb=0 0 183 170
+ \caption{Voltage Divider}
+ \label{fig:vd}
+\end{figure}
+%The looking at figure \ref{fig:vd} the standard voltage divider formula (equation \ref{eqn:vd}) is used.
+
+\begin{equation}
+\label{eqn:vd}
+ V_{out} = V_{in}.\frac{Z2}{Z2+Z1}
+\end{equation}