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===T-H Example===
#REDIRECT [[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.gif|thumb|center|300px|]]
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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. Humidity plot at a constant temperature of 338K.
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[[Image:ALTA9stressplot.gif|thumb|center|300px|Life vs. Humidity plot with temperature fixed at 338K.]]
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Latest revision as of 02:03, 14 August 2012

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