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Posted by: George Pyryt
Date posted: Fri Jun 9 15:58:04 US/Eastern 2000
Subject: Non-op electrical overstress factor
During the calculation of failure rates, Prism includes a serperate term for electrical overstress failure rate for all models. If I am trying to calculate the failure rate during storage over a long period of time, I do not think the electrical overstress should be that large of a factor. Is there a suggested factor or approach that I could use to reduce the part failure rate by when evaluating storage reliability. The failure rate Prism gives for a given resistor for example can be 2 orders of magnitude larger than if using the Mil-Std-217 data reduced by a factor of .01 for storage. The Prism failure rate I used included your previous suggestion of using 0 degree temperature rise for each component and 0% duty time.
Posted by: Don Alderman
Date posted: Fri Jun 2 12:20:39 US/Eastern 2000
Subject: Process Grading
We have purchased the PRISM program and are currently trying to evaluate the approach for process grading. Some questions and concerns have come up:
1. Apparently only the questions with asterisks have to be answered. Please confirm.
2. Assuming 1. above is true, it seems the process grading could be subject to unscrupulous users wanting to get the competitive edge. The questions without asterisks could be "cherry picked" to increase the process score. If this is true, are we in a numbers game?
3. How do we find the "default" process grading pi factor values? The documentation only says they are "average" values.
Posted by:Feng Bin
Date posted: Thu May 25 20:33:34 US/Eastern 2000
Subject: Install For Windows98
My computer is working in Windows 98.I download install.exe document yesterday.But when I installed,it indicate "DCOM 95 can only be installed on windows 95.For windows 98,Please install latest DCOM 98.For windows NT,Please install latest service packs."Does it have another install.exe for windows 98?
Posted by: Jim Ramsden
Date posted: Wed May 10 14:06:11 US/Eastern 2000
Subject: PRIZM Demo on NT
I installed the PRIZM demo on my PC which is running NT 4.0 SP3. When I bring up the Example System and add a component, I can select IC as the part category, but under part type it says in red - No RACRates Model. And when I try to select a type on the drop down list I get a Windows error - Index Does Not Exist. ItemDescription_UpshiftLevels isn't an index in this table. This PRIZM demo (that I DL'd yesterday) is V1.0 Release 1 Build 0. Any ideas ? Thanks...jrr
Posted by: Fred Levesque
Date posted: Fri Apr 28 13:28:19 US/Eastern 2000
Subject: Solder-joint factor
In performing RACRate calculations, I have noticed that for most parts the "Solder Joint" factor is the largest contributor to the failure rate. In IC memories this factor is two orders of magnitude larger than everything else combined! What is the justification for this effect?
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