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Forum: Reliability & Maintainability Questions and Answers

Topic: Reliability & Maintainability Questions and Answers

Topic Posted by: Reliability & Maintainability Forum (src_forum@alionscience.com )
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998

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Original Message:

Posted by: Ananda Perera (Ananda.Perera@alliedsignal.com )
Organization:AlliedSignal Aerospace Canada
Date posted: Thu Apr 8 8:34:17 US/Eastern 1999
Subject: Microcircuit Quality Factors for Custom Screening
Message:
MIL-HDBK-217F, Notice 2; Section 5.10 - Microcircuits Quality Factors Reference Page 5-16: In the Quality Factor calculation for Custom Screening Programs, MIL-STD-883 Tests for Group 1 & Group 2 are the same. However (1) Point Valuation for Group 1 is 50; (2) Point Valuation for Group 2 is 37 ????? How can both Groups having same tests have different Point Valuations and hence different Quality Factors ?????


Reply:

Subject: Microcircuit Quality Factors for Custom Screening
Reply Posted by: Ananda Perera (Ananda.Perera@alliedsignal.com )
Organization: AlliedSignal Aerospace Canada
Date Posted: Sat Apr 10 20:11:59 US/Eastern 1999
Message:
For Microcircuits,MIL-HDBK-217 does not have an error in Quality Factor Calculation for Custom Screening Programs.It was my mistake not detecting (1)a "and" condition in Group 1 screening, (2)a "or" condition in Group 2 screening


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