ok nearly drawn a derived component for the potdiv

noninvopamp/noninvopamp.tex

@@ -24,13 +24,101 @@ We can now create a functional group representing the amplifier,
 by bringing the failure modes from the potential divider and 
 the op-amp into a functional group.
 
-This can now be analysed and a derived component to represent th non inverting
+This can now be analysed and a derived component to represent the non inverting
 amplifier determined.
 }
 }
 {
 }
 
+\section{Introduction}
+
+Standard non inv op amp from ``art of electronics'' ~\cite{aoe}[pp.234] shown in figure \ref{fig:noninvamp}.
+
+\begin{figure}[h]
+ \centering
+ \includegraphics[width=200pt,keepaspectratio=true]{./noninvopamp/noninv.jpg}
+ % noninv.jpg: 341x186 pixel, 72dpi, 12.03x6.56 cm, bb=0 0 341 186
+ \caption{Standard non inverting amplifier configuration}
+ \label{fig:noninvamp}
+\end{figure}
+
+
+
+The functional of the resistors in this amplifier is to set the gain.
+They operate as a potential divider and program the minus input on the op-amp
+to balance them against the positive input, giving the voltage gain ($G_v$)
+defined by $$ G_v = 1 + \frac{R2}{R1} $$ at the output.
+
+As the resistors work to provide a specific function, that of a potential divider,
+we can treat them as a functional group.
+Using the EN298 specification for resistor failure ~\cite{en298}[App.A]
+we can assign  failure modes of $OPEN$ and $SHORT$ to the resistors.
+Thus $R1$ has failure modes $\{R1\_OPEN, R1\_SHORT\}$ and $R2$ has failure modes $\{R2\_OPEN, R2\_SHORT\}$.
+
+Modelling this as a functional group, we can draw a circle to represent each failure mode
+in the potential divider, shown in figure \ref{fig:fg1}.
+
+
+\begin{figure}[h]
+ \centering
+ \includegraphics[width=200pt,keepaspectratio=true]{./noninvopamp/fg1.jpg}
+ % fg1.jpg: 430x271 pixel, 72dpi, 15.17x9.56 cm, bb=0 0 430 271
+ \caption{potential divider `functional group' failure modes}
+ \label{fig:fg1}
+\end{figure}
+
+We can now look at each of these base component failure modes,
+and determine how they will affect the operation of the potential divider.
+Each failure mode scenario we look at will be given a teat case number,
+which is represented on the diagram, with an asterisk marking 
+which failure modes is is modelling (see figure \ref{fig:fg1a}).
+
+\begin{figure}[h]
+ \centering
+ \includegraphics[width=200pt,keepaspectratio=true]{./noninvopamp/fg1a.jpg}
+ % fg1a.jpg: 430x271 pixel, 72dpi, 15.17x9.56 cm, bb=0 0 430 271
+ \caption{potential divider with test cases}
+ \label{fig:fg1a}
+\end{figure}
+
+
+\begin{table}[ht]
+\caption{Potential Divider: Failure Mode Effects Analysis: Single Faults} % title of Table
+\centering % used for centering table
+\begin{tabular}{||l|c|c|l|l||}
+\hline \hline
+ \textbf{Test} & \textbf{Pot.Div} & \textbf{  } & \textbf{General}   \\
+ \textbf{Case} &  \textbf{Effect} & \textbf{  } & \textbf{Symtom Description}   \\
+%   R         &    wire        & res +         & res -    & description
+\hline
+\hline
+ TC1: $R_1$ SHORT    &  LOW       &       &  Low PD \\ 
+ TC2: $R_1$  OPEN    &  HIGH        &       &  High PD \\ \hline
+ TC3: $R_2$ SHORT    &  HIGH        &      &  High PD \\  
+ TC4: $R_2$ OPEN     &  LOW         &      &  Low PD \\ \hline
+\hline
+\end{tabular} 
+\label{pdfmea}
+\end{table}
+
+
+We can now collect the symptoms of failure. From the four base component failure modes, we now
+have two symptoms, $LOW\;PD, HIGH\;PD$. 
+
+We can represent the collection of these symptoms by drawing connecting lines between 
+the test cases and naming them (see figure \ref{fig:fg1b}).
+
+
+\begin{figure}[h]
+ \centering
+ \includegraphics[width=200pt,keepaspectratio=true]{./noninvopamp/fg1b.jpg}
+ % fg1b.jpg: 430x271 pixel, 72dpi, 15.17x9.56 cm, bb=0 0 430 271
+ \caption{Collection of potential divider failure mode symptoms}
+ \label{fig:fg1b}
+\end{figure}
+
+
 \vspace{60pt}
 $$ \int_{0\-}^{\infty}  f(t).e^{-s.t}.dt  \; | \; s \in \mathcal{C}$$
 \today

noninvopamp/paper.tex

@@ -33,7 +33,7 @@
 \author{R.P.Clark}
 \title{Two stage FMMD analysis of a non inverting op-amp}
 \maketitle 
-\input{noninvopamp}
+\input{noninvopamp_paper}
 
 \bibliographystyle{plain}
 \bibliography{../vmgbibliography,../mybib}