working on design aid chapter.

fmmd_design_aide/fmmd_design_aide.tex

@@ -145,6 +145,20 @@ TC:8 $OP\_AMP$ LATCH DOWN     &  low amp output            &  Out of Range     &
 \label{tab:fmmdaide1}
 \end{table}
 
+
+This analysis process, which given the components R18,R22,R26,R30,IC1, has derived 
+the component "milli-volt amplifier" with two failure modes, `Out of Range' and 
+`Low reading'.
+we can represent this in an FMMD hierarchy diagram, see figure \ref{fig:mvamp_fmmd}.
+
+\begin{figure}[h]
+ \centering
+ \includegraphics[width=200pt,keepaspectratio=true]{./fmmd_design_aide/mvamp_fmmd.jpg}
+ % mvamp_fmmd.jpg: 281x344 pixel, 72dpi, 9.91x12.14 cm, bb=0 0 281 344
+ \caption{FMMD analysis Hierarchy for Milli-Volt Amplifier}
+ \label{fig:mvamp_fmmd}
+\end{figure}
+
 The table \ref{tab:fmmdaide1} shows two possible causes for an undetectable
 error, that of a low reading due to the loss of the offset millivolt signal.
 Typically this type of circuit would be used to read a thermocouple
@@ -153,6 +167,7 @@ beleive that the temperature reading is lower than it actually is.
 To take an example from a K type thermocouple, the offset of 1.86mV
 from the potential divider represents amplified to $\approx \, 342mV$ would represent  $\approx \; 46\,^{\circ}{\rm C}$.
 
+\clearpage
 \subsection{Undetected Failure Mode: Incorrect Reading}
 
 Although statistically, this failure is unlikely (get stats for R short FIT etc from pt100 doc)
@@ -163,6 +178,7 @@ test $R_{off}$ periodically.
 For instance were we to check $R_off$ every $\tau = 20mS$ work out detection
 allowance according to EN61508.
 
+
 \section{Proposed Checking Method}
 
 Were we to switch in a a second resistor in parrallel with the