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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: Lim (limth@cet.st.com.sg )
Date posted: Thu Jul 18 3:54:01 US/Eastern 2002
Subject: ESS for Fine Pitch SMT components
Message:
Hi, My company is currently using fine pitch SMT components in one of our products. We practise ESS whereby we subject products to Random vibration of 20-1000Hz with a Grms of about 6g. However, because of these fine pitch components used, we are concerned that the mentioned vibration profile will damage the product. Does anyone have any experience in this area whcih they can advise. Is there any specific profile to use? Tks.


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Subject: ESS for Fine Pitch SMT components
Reply Posted by: Lim
Date Posted: Wed Jul 31 1:06:03 US/Eastern 2002
Message:
Hi, Joe, thanks for advice. I have done a vibration with increasing grms values starting with 1 thru 6. The product was still functioning. Therefore, we have decided that we will perform our vibration ESS at about 5grms and a ASD of 0.03g2/Hz on our production units and then analyze any failures and adjust the screen accordinly. Tks.


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