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Posted by: Thomas Urbanczyk
Date posted: Thu Aug 11 2:21:58 US/Eastern 2005
Subject: Assembly Copy&Paste Bug?
I came across the following critical bug:
If I copy an assembly containing of sub-assemblys and components and paste it into another system (another PRISM project-file) OR even paste it into another assembly of the same system, ALL components of the copied assembly will get lost after I save the file, close it and open it again.
It seems, that the program-internal component IDs get corrupted.
Is there any known workaround for this serious bug and if not, could you state, when the next PRISM update is supposed to be available?
Posted by: Jim Weber
Date posted: Wed Apr 27 11:57:30 US/Eastern 2005
Subject: Question about Instantaneous Failure Time
Could you please explain the meaning of the "Instantaneous Failure Time" factor which can be changed for the Infant Mortality Process Grade?
The manual says: "the time when all infant mortality failures have been removed from the system".
I understand it that way, that the shorter the "Instantaneous Failure Time" the better the Infant Mortality Process Grade is supposed to be, as (corresponding to the manual) it takes less time to remove infant mortality failures from the system.
But in fact the opposite seems to apply.
Posted by: Thomas Urbanczyk
Date posted: Fri Apr 15 8:19:53 US/Eastern 2005
Subject: Question: Process Grade Scoring
1.) I would like to know, if there is any documentation about the Process Grade Scoring available.
In special I would like to know how the grade of answered questions does correlate to the corresponding Pi-factor of the process grade. As far as I can see, the grade of answered questions does not change the corresponding Pi-factor in a linear manner. That kind of knowledge would greatly improve my understanding about the way, how the list of questions for each process grade correlates to the expected defect rate in the end. And as a result it would make it quite easy to do "what if" studies for our customers based on MS-Excel, for different qualities of answered questions.
2.) Is there any system report available in the PRISM tool to state the made data input? For example the component detail system report does only show the calculated PI-factors. However our customers will have no use for that kind of information, however they would, if a report would state the made data input (e.g. capacitor: capacitance, rated/applied voltage). If it's not possible at the moment; is this feature possibly planned for a future version?
Posted by: S.Arun Kumar
Date posted: Wed Feb 9 12:48:39 US/Eastern 2005
Subject: PRISM Model for PCBs
When we want to compute the FR for PCB, we were not able to find a model for it in PRISM. We are Currently using MIL 217FN2 for PCBs.
Now the Questions we have are
Q1. How do I compute the Failure Rate for the PCBs using PRISM.
Q2. In MIL 217FN2 we have Model for PTH and SMT Version of the PCB. My Query is that since we take the solder joint factor, Cycling Rate Factor for most of the components we are using in PRISM, do we need to separately calculate the FR of the PCB (SMT Technology).
Posted by: Bruce Cook
Organization:Westingouse Electric Company
Date posted: Wed Feb 2 12:32:56 US/Eastern 2005
Subject: PRISM Acceptance
Now that PRISM has been in use for a few years, has there been any published acceptance of it by the Department of Defense as an alternative to MIL-HDBK-217? I am working in the nuclear power industry and frequently see the handbook specified as the accepted way to predict failure rates. I would like to have credible evidence that PRISM is accepted as an alternative approache.
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