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Robin Clark 2012-04-05 16:33:39 +01:00
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papers/software_fmea/software_fmea.tex
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@ -373,7 +373,7 @@ Let us define any value outside the 4mA to 20mA range as an error condition.
As a voltage, we use ohms law~\cite{aoe} to determine the voltage ranges: $V=IR$, $0.004A * \ohms{220} = 0.88V$ As a voltage, we use ohms law~\cite{aoe} to determine the voltage ranges: $V=IR$, $0.004A * \ohms{220} = 0.88V$
and $0.020A * \ohms{220} = 4.4V$. and $0.020A * \ohms{220} = 4.4V$.
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Our acceptable voltage range is therefore $V >= 0.88 \wedge V<= 4.4$. Our acceptable voltage range is therefore $$V >= 0.88 \wedge V<= 4.4 \; .$$
This voltage range forms our input requirement. This voltage range forms our input requirement.
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We can now examine a software function that performs a conversion from the voltage read to We can now examine a software function that performs a conversion from the voltage read to