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January 1997

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Subject:
Reliability Testing
From:
Bob Willis <[log in to unmask]>
Date:
02 Jan 97 03:22:34 EST
Content-Type:
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What does accelerated testing mean in terms of time ?

Take for example 16h at 155oC for Solderability it is accepted to = 1 year

The IPC SM 785 Table one provides temperature cycling conditions but does it
provide an indication on the equivalent in days and years. 

What do the following tests relate to in days, years etc.

7 days 85%RH 85oC = ?

21 days 85%RH 85oC = ?

21 days 40oC 95%RH = ?

Temperature cycling -55 to 125oC = ?

A listing of the suggested test conditions and what they are considered to
equate too will be mailed to the IPC forum. 


Bob Willis
Process Engineering Consultant
Electronic Presentation Services
2 Fourth Avenue, Chelmsford, Essex CM1 4HA. England.
Tel: (44) 01245 351502
Fax: (44) 01245 496123
Home Page: http://ourworld.compuserve.com/homepages/Bwillis
Email: [log in to unmask]

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