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[[T-H Example]]
#REDIRECT [[T-H_Example]]
===T-H Example===
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The following data were collected after testing twelve electronic devices at different temperature and humidity conditions:
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[[Image:ex1chp9.png|center|400px|]]
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Using ALTA, the following results were obtained:
 
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::<math>\begin{align}
\widehat{\beta }=\ & 5.874395 \\
&  &  \\
\widehat{A}=\ & 0.000060 \\
&  &  \\
\widehat{b}=\ & 0.280599 \\
&  &  \\
\widehat{\phi}=\ & 5630.329851 
\end{align}</math>
 
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A probability plot for the entered data is shown next.
 
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[[Image:ALTA9probabilityplot.gif|thumb|center|300px|Probability plots at the tested combinations.]]
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Note that three lines are plotted because there are three combinations of stresses, namely, (398K, 0.4), (378K, 0.8) and (378K, 0.4). 
 
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Given the use stress levels, time estimates can be obtained for specified probability. A Life vs. Stress plot can be obtained if one of the stresses is kept constant. For example, the following picture is a Life vs. Temperature plot at a constant humidity of 0.4.
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[[Image:ALTA9stressplot.gif|thumb|center|300px|Life vs. Temperature plot with humidity fixed at 0.4.]]
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Latest revision as of 02:03, 14 August 2012

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