From 1e3badc3084335d49a3dbc26d27c4c874b7091a3 Mon Sep 17 00:00:00 2001
From: Robin <robin@NovaProspect.(none)>
Date: Sat, 12 Jun 2010 00:07:09 +0100
Subject: [PATCH] formatting

---
 pt100/pt100.tex | 29 ++++++++++++++++++++++++++---
 1 file changed, 26 insertions(+), 3 deletions(-)

diff --git a/pt100/pt100.tex b/pt100/pt100.tex
index 2ff976a..f7c9daf 100644
--- a/pt100/pt100.tex
+++ b/pt100/pt100.tex
@@ -22,6 +22,29 @@ Thus after the analysis the PT100 temperature sensing circuit, may be veiwed
 from an FMEA persepective as a component itself, with a set of known failure modes.
 
 \end{abstract}
+}
+{
+
+\section{Overview}
+The PT100, or platinum wire \ohms{100} sensor is 
+a widely used industrial temperature sensor that is
+slowly replacing the use of thermocouples in many 
+industrial applications below 600\oc, due to high accuracy\cite{aoe}.
+
+This chapter looks at the most common configuration, the 
+four wire circuit, and analyses it from an FMEA perspective twice.
+Once considering single faults (cardinality constrained powerset of 1) and then again, considering the 
+possibility of double faults (cardinality constrained powerset of 2).
+
+The analysis is performed using Propositional Logic
+diagrams to assist the reasoning process.
+This chapter describes taking
+the failure modes of the components, analysing the circuit using FMEA
+and producing a failure mode model for the circuit as a whole.
+Thus after the analysis the PT100 temperature sensing circuit, may be veiwed 
+from an FMEA persepective as a component itself, with a set of known failure modes.
+
+
 }
 
 \begin{figure}[h]
@@ -33,7 +56,7 @@ from an FMEA persepective as a component itself, with a set of known failure mod
 \end{figure}
 
 
-\section{Overview of PT100 four wire circuit}
+\section{General Description of PT100 four wire circuit}
 
 The PT100 four wire circuit uses two wires to supply small electrical current,
 and returns two sense volages by the other two.
@@ -277,7 +300,7 @@ Using the temperature ranges defined above we can compare the voltages
 we would get from the resistor failures to prove that they are
 `out of range'. There are six test cases and each will be examined in turn.
 
-\subsubsection{ TC1 : Voltages $R_1$ SHORT } 
+\subsubsection{ TC 1 : Voltages $R_1$ SHORT } 
 With pt100 at 0\oc 
 $$ highreading = 5V $$
 Since the highreading or sense+ is directly connected to the 5V rail,
@@ -290,7 +313,7 @@ $$ lowreading = 5V.\frac{2k2}{2k2+212.02\Omega} = 4.56V$$
 Thus with $R_1$ shorted both readingare outside the 
 proscribed range in table \ref{ptbounds}.
 
-\subsubsection{ TC2 : Voltages $R_1$ OPEN } 
+\subsubsection{ TC 2 : Voltages $R_1$ OPEN } 
 
 In this case the 5V rail is disconnected. All voltages read are 0V, and 
 therefore both readings are outside the