From 4c0590e3cc4cc7aa67a24fc7485baf912389b29f Mon Sep 17 00:00:00 2001 From: "Robin P. Clark" Date: Fri, 13 Sep 2013 15:53:05 +0100 Subject: [PATCH] pellls pool last chance saloon --- submission_thesis/CH2_FMEA/copy.tex | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/submission_thesis/CH2_FMEA/copy.tex b/submission_thesis/CH2_FMEA/copy.tex index 52dfff2..deceba3 100644 --- a/submission_thesis/CH2_FMEA/copy.tex +++ b/submission_thesis/CH2_FMEA/copy.tex @@ -287,7 +287,8 @@ for instance for {\textbf{Resistor,~Fixed,~Film}} the following failure causes a % against {\fms} that the resistor could exhibit. % We can determine these {\fms} by converting the internal failure descriptions % to {\fms} thus: -To make this useful for FMEA each failure cause must be mapped to a symptomatic failure mode descriptor +To make this useful for FMEA each failure cause must be mapped to a +symptomatic failure mode descriptor~\footnote{The symptomatic descriptors chosen are based on experience and are not unique.} as listed below: % %and map these failure causes to three symptoms, @@ -302,7 +303,7 @@ as listed below: \item Lead damage 1.9\% $\mapsto$ OPEN. \end{itemize} % -The symptomatic descriptor chosen is based on experience and are not unique. + % Note, that the main cause of resistor value drift is overloading. % of components. This is borne out in the FMD-91~\cite{fmd91}[232] entry for a resistor network where the failure @@ -447,7 +448,7 @@ This failure cause maps to $HIGH$ or $LOW$. \paragraph{Open input: $V_+$.} This failure cause will mean that the minus input will have the very high gain of the Op-Amp applied to it, and the output will be forced HIGH or LOW. -This failure cause maps to $HIGH$ or $LOW$.\footnote{No failure mode for open input $V_-$ was listed in this FMD-91 entry~\cite{fmd91}{3-116].} +This failure cause maps to $HIGH$ or $LOW$~\footnote{No failure mode for open input ${V}_{-}$ was listed in this FMD-91 entry~\cite{fmd91}[3-116].}. \paragraph{Collecting Op-Amp failure modes from FMD-91.} An Op-Amp's failure mode behaviour, under FMD-91 definitions will have the following {\fms}: @@ -1561,4 +1562,4 @@ This means that re-use, review and checking of traditional analysis must often b % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% -%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% \ No newline at end of file +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%