Case
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Description
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1
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Case 1 is used if temperature and stress factors are unknown. In this case, the temperature is assumed to be 40 degrees C, and all operating stresses are assumed to be 50 percent. Additionally, the burn-in time is assumed to be 1 hour or less.
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2
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Case 2 is used when the burn-in time is more than 1 hour. In all other respects, Case 2 is identical to Case 1.
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3
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Case 3 is used when temperature and stress factors are known and are entered for the component.
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