PRISM Forum
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Posted by: George Pyryt
(gpyryt@draper.com
)
Organization:Draper Laboratory
Date posted: Tue Apr 11 12:14:22 US/Eastern 2000
Subject: Storage reliability
Message:
I would like to calculate the dormant storage reliability of a system using PRISM. I set duty cycle and cycling rate to zero and also did not input any stress parameters for parts. The result gives me a failure rate which includes solder joint and electrical overstress failure rate components for each part in addition to the part nonoperational failure rate. I also applied Process Grade Factor. Is this failure rate comparable to previous approach of using 1% conversion factor for dormant storage? If not, what data should be used to get storage reliability.
Posted by: Leroy Meyers
(meyers@generalatronics.com
)
Organization:General Atronics Corporation
Date posted: Tue Mar 14 11:22:37 US/Eastern 2000
Subject: PRISM Parameters
Message:
Two Questions:
1. As a follow up to Mr. Dooley's question regarding PRISM acceptance, have international (outside the U.S.) governments or companies began to accept PRISM?
2. I have tried the Demo version of PRISM. I am curious about the Pi and Lambda factor calculations. If I buy the PRISM package, would I receive anything that explains how these factors are calculated? I compare this to a software package that uses the 217 model, like Relex. The software will perform calculations, but I can still look in 217 to determine how a factor was derived.
Posted by: Al Dooling
(alfred.l.dooling@lmco.com
)
Organization:Lockheed Martin
Date posted: Fri Mar 10 15:39:12 US/Eastern 2000
Subject: PRISM Acceptance
Message:
What companies or government organizations are using PRISM? What has the response been? Do you know if any government/military organization is accepting PRISM output as an alternative to MIL-HDBK-217F.
Posted by: Kenneth Meyerhoffer
(kmeyerho@csw.L-3com.com
)
Date posted: Tue Feb 15 11:15:02 US/Eastern 2000
Subject: PRISM common elements database error
Message:
I have installed the PRISM demo but, I am also getting the 'Unable to connect to common elements database. Teminating...' message. My PC meets all of the stated minimum requirements. What next?
Posted by: Ananda Perera
(Ananda.Perera@honeywell.com
)
Organization:Honeywell
Date posted: Sun Jan 30 16:45:24 US/Eastern 2000
Subject: Infant Mortality (IM) Pi Factor
Message:
Reference RAC Journal, Third Quarter-1999 Page 4 Pi_IM Equation:
(1) When SS=0.5; Pi_IM(Instantaneous at 5 Year) = 0.7662 and Pi_IM (Average over 5 Years) = 0.4728.
(2) When SS=0.9; Pi_IM(Instantaneous at 5 Year) = 1.3792 and Pi_IM (Average over 5 Years) = 0.8512.
Why does Pi_IM Factor increase when Screening Strength (SS)was increased. High Screening Strength is supposed to give lower failure rate.
Thanks.
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