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Weibull++ Standard Folio

Life Data Analysis Example

Ten identical units of a prototype device were reliability tested at the same application and operation stress levels. Six of the units failed during testing after operating for the following times: 16, 34, 53, 75, 93, 120 hours. Four other units were still operating after 120 hours.

The objective is to obtain the reliability of the prototype device at 60 hours, at the lower 1-sided 90% confidence bound.

The parameters of the distribution will be automatically computed and displayed in the Analysis Summary area of the control panel. The parameters are beta = 1.5070 and eta = 128.6414.

Click Calculate to obtain the results, as shown next.

The result shows that the reliability of the prototype device at 60 hours is 72.84%. The lower one-sided 90% confidence bound is estimated to be 54.32%. This means that there is 90% probability that the reliability of the device will be at least 54.32% at the end of 60 hours of operation.

Reliability vs. Time plot

 

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