Temperature-Nonthermal Relationship Example: Difference between revisions
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<noinclude>{{Banner_ALTA_Examples}} | <noinclude>{{Banner_ALTA_Examples}} | ||
</noinclude>Twelve electronic devices were put into a continuous accelerated life test and the following data were collected. | </noinclude>Twelve electronic devices were put into a continuous accelerated life test and the following data were collected. | ||
[[Image:ALTA10t1.png|center|400px|]] | [[Image:ALTA10t1.png|center|400px|]] | ||
Using ALTA and the T-NT lognormal model, the following parameters were obtained: | Using ALTA and the T-NT lognormal model, the following parameters were obtained: | ||
::<math>\begin{align} | ::<math>\begin{align} | ||
\widehat{Std}=\ & 0.182558 \\ | \widehat{Std}=\ & 0.182558 \\ | ||
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\end{align}</math> | \end{align}</math> | ||
A probability plot, with the 2-sided 90% confidence bounds for the use stress levels of 323K and 2V, is shown next. | A probability plot, with the 2-sided 90% confidence bounds for the use stress levels of 323K and 2V, is shown next. | ||
[[Image:T-NT_Ex1.gif|center|600px|Probability plot for the use stress levels of 323K and 2V]] | [[Image:T-NT_Ex1.gif|center|600px|Probability plot for the use stress levels of 323K and 2V]] | ||
An acceleration factor plot, in which one of the stresses must be kept constant, can also be obtained. For example, in the following plot, the acceleration factor is plotted versus temperature given a constant voltage of 2V. | An acceleration factor plot, in which one of the stresses must be kept constant, can also be obtained. For example, in the following plot, the acceleration factor is plotted versus temperature given a constant voltage of 2V. | ||
[[Image:T-NT_Ex2.gif|center|600px|Acceleration facton versus temperature given a constant voltage of 2V]] | [[Image:T-NT_Ex2.gif|center|600px|Acceleration facton versus temperature given a constant voltage of 2V]] | ||
Revision as of 07:43, 7 August 2012
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Twelve electronic devices were put into a continuous accelerated life test and the following data were collected.
Using ALTA and the T-NT lognormal model, the following parameters were obtained:
- [math]\displaystyle{ \begin{align} \widehat{Std}=\ & 0.182558 \\ \widehat{B}=\ & 3729.650303 \\ \widehat{C}=\ & 0.035292 \\ \widehat{n}=\ & 0.776797 \end{align} }[/math]
A probability plot, with the 2-sided 90% confidence bounds for the use stress levels of 323K and 2V, is shown next.
An acceleration factor plot, in which one of the stresses must be kept constant, can also be obtained. For example, in the following plot, the acceleration factor is plotted versus temperature given a constant voltage of 2V.
