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Notes from C Garrett

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Robin Clark 2011-02-24 13:22:40 +00:00
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pt100/pt100.tex
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@ -677,7 +677,7 @@ TC 12: & $R_1$ SHORT $R_2$ SHORT & high & low & Both out of ran
TC 14: & $R_1$ SHORT $R_3$ SHORT & high & high & Both out of range \\ \hline TC 14: & $R_1$ SHORT $R_3$ SHORT & high & high & Both out of range \\ \hline
\hline \hline
TC 15: & $R_2$ OPEN $R_3$ SHORT & high & Floating input Fault & sense+ out of range \\ \hline TC 15: & $R_2$ OPEN $R_3$ OPEN & high & Floating input Fault & sense+ out of range \\ \hline
TC 16: & $R_2$ OPEN $R_3$ SHORT & high & high & Both out of Range \\ \hline TC 16: & $R_2$ OPEN $R_3$ SHORT & high & high & Both out of Range \\ \hline
TC 17: & $R_2$ SHORT $R_3$ OPEN & high & low & Both out of Range \\ \hline TC 17: & $R_2$ SHORT $R_3$ OPEN & high & low & Both out of Range \\ \hline
TC 18: & $R_2$ SHORT $R_3$ SHORT & low & low & Both out of Range \\ \hline TC 18: & $R_2$ SHORT $R_3$ SHORT & low & low & Both out of Range \\ \hline
@ -864,13 +864,13 @@ a given cardinality constraint is not visually obvious.
\subsubsection{Symptom Extraction} \subsubsection{Symptom Extraction}
We can now examine the results of the test case analysis and apply symptom abstraction. We can now examine the results of the test case analysis and apply symptom abstraction.
In all the test case results we have at least one an out of range value, except for In all the test case results we have at least one out of range value, except for
$TC\_7$ $TC\_7$
which has two unknown values/floating readings. We can collect all the faults, except $TC\_7$, which has two unknown values/floating readings. We can collect all the faults, except $TC\_7$,
into the symptom $OUT\_OF\_RANGE$. into the symptom $OUT\_OF\_RANGE$.
As a symptom $TC\_7$ could be described as $FLOATING$. We can thus draw a PLD diagram representing the As a symptom $TC\_7$ could be described as $FLOATING$. We can thus draw a PLD diagram representing the
failure modes of this functional~group, the pt100 circuit from the perspective of double simultaneous failures, failure modes of this functional~group, the pt100 circuit from the perspective of double simultaneous failures,
in figure \ref{fig:dubsim}. in figure \ref{fig:pt100_doublef}.
\begin{figure}[h] \begin{figure}[h]