SRC Forum - Message Replies
Forum: Reliability & Maintainability Questions and Answers
Topic: Reliability & Maintainability Questions and Answers
Topic Posted by: Reliability & Maintainability Forum
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998
Posted by: Mark Urban
Date posted: Thu Jan 21 13:57:05 US/Eastern 1999
Does burn in today buy you anything? We currently perform a static burn in with after burn test defects around 0.001%.
Dynamic burn in has been suggested. What about HALT testing on prototypes and eliminating burn in on production lots.
Any input would be much appreciated.
Reply Posted by: Bruce Dudley
Organization: Reliability Analysis Center
Date Posted: Thu Jan 21 15:33:49 US/Eastern 1999
Looking at your low defect rate of 0.001%, it seems that the static burn-in test is either not stressing the units sufficiently or the quality is great. A dynamic burn-in test could add additional stress. If you continue to find few failures with a stress increased static test or a new dynamic test, then you should consider stopping the burn-in entirely. Burn-in testing is a functional test if there are lots of defects. On the other hand, HALT testing is usually done to find design and component deficiencies, not manufacturing and vendor defects.
Reply Posted by: Mark Morelli
)Otis Elevator Co.
Date Posted: Wed May 19 8:43:43 US/Eastern 1999
I agree with Bruce's comment. We discontinued burn-in several years ago (after discovering it's not effective in participating the types of defects that were escaping to the field). We recently implemented Highly Accelerated Stress Screening (HASS) which is based upon HALT results and it performed during production. We are having much beeter results finding defects in the factory as opposed to in the field.