Forum: Reliability & Maintainability Questions and Answers
Posted by: Ian-C Date posted: Wed Apr 11 6:55:36 US/Eastern 2001 Subject: Activation Energies Message: I have been supplied 3 temperature and humidity conditions (75C/90%RH; 85C/90%RH; 85C/65%RH) and 3 associated MTTF's. Is there a way that I can calculate the Activation Energy and humidity acceleration factor from this given information. If this is not possible, what other information would be required, other than the normal temperature and humidity operating conditions. (I would normally use the Peck model(Arrhenius-Lawson)for this) If it is not possible to calculate it under damp heat conditions can it be done for dry heat (Arrhenius only). Any help/advice will be greatly appreciated Thanks in advance
Posted by: Ron Date posted: Tue Apr 10 16:19:42 US/Eastern 2001 Subject: Confidence level of the prediction Message: Hello: Always can learn a lot from your guys. Here is the question. I was told that the confidence level for 217 prediction is 60%, and for Bellcore is 90%. Is it true? I checked with 217 HDBK, no such number is found. Only found "the failure rate models are point estimates". BTW, what's the confidence level for PRISM? Thanks in advance.
Posted by: Johnson Wood Date posted: Tue Apr 10 3:52:06 US/Eastern 2001 Subject: Derating and stress prediction Message: We want to conduct a stress prediction and derating on a product. But how to get the practical stress values of various of components in early stages of life cycle? Thanks.
Posted by: David Vermeis (dvvermeis@lambtech.com ) Organization:Lamb Assembly & Test Date posted: Mon Apr 9 16:34:57 US/Eastern 2001 Subject: HALT, HASS Message: Can anyone give me a good infromation source (books, aritcles, web sites) for HALT & HASS testing? Thanks.
Posted by: Johnson Wood Date posted: Wed Apr 4 22:41:05 US/Eastern 2001 Subject: Burn-in Message: A circuit board was burned-in before product released, for some reasons, a component on it was replaced by a new one. Will it be necessary to burn-in again on this board? If the answer is yes, will the burn-in affect other conponents on this board? Thanks.
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