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ALTA Test Plan Utility

ALTA Test Plan Utility Example

ALTA Test Plan Types

The ALTA Test Plan utility allows you to choose a test plan type that will best fit your test goals and resource constraints. Which test plans are available will depend on whether you chose to design a one-stress or two-stress test in the Number of Simultaneous Stresses drop-down list. Each test plan will attempt to minimize the variance on the BX% life you specified in the BX% Life Estimate Sought field.

If you selected to design a single-stress test, the following test plans will be available:

If you selected to design a two-stress test, the following test plans are available:

The mid stress level is calculated such that the units tested at the 2nd and 3rd stress combinations will have the same probability of failure at the end of the test. The proportion of units allocated to each stress level is computed in order to minimize the variance on the BX% life.

The mid stress values A and B are calculated such that the units tested at the 2nd and 3rd stress combinations will have the same probability of failure at the end of the test. The mid stress values C and D are calculated such that the units tested at the 4th and 5th stress combinations will have the same probability of failure at the end of the test. The proportion of units allocated to each stress level is computed in order to minimize the variance on the BX% life.

 

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