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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: Bob Valerius (robert_m_valerius@md.northgrum.com )
Organization:Northrop-Grumman Oceanic & Naval Systems
Date posted: Wed Aug 9 8:45:07 US/Eastern 2000
Subject: ESS
Message:
Hi I am wondering what the current thinking on ESS is. It appears to me that activity in this arena is waning as most screening is no longer viewed as needed, especially with so many COTS products. Is this an accurate view? Comments and emails from those with experience would be appreciated.


Reply:

Subject: ESS testing of COTS
Reply Posted by: Bruce Dudley (bdudley@alionscience.com )
Organization: Reliabiity Analysis Center
Date Posted: Thu Aug 10 14:02:41 US/Eastern 2000
Message:
At the Reliability Analysis Center, we have been collecting data on commercial off the shelf (COTS) equipment. The data seems to show that a number of failures have been and probably will continue to be experienced early in the life of the equipment due to manufacturing anomolies. Many of the failure that were collected on COTS personnel computer systems involved solder joint failures. It seems that one of the prime environmental stress screening techniques is vibration testing which should reveal this failure mode. With this in mind, one should consider the environment that the COTS equipment will be placed. If the environment is harsh, ESS testing should be exercised to remove early faults from the system. Many of the COTS systems were not designed for harsh environments, so ESS testing is a viable routine to see if significant problems are revealed. In the old days, we called this testing "RJT" (Reliability Junk Testing).


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