Although I am not from a captive assembly house, I would be glad to work
with you off-line to develop a more effective screening process.  The
process that you are using now does not seem to provide much thermal
stress, and is probably not very effective in weeding out problems.



>Our company is currently evaluating the use of Burn-In or Environmental
>Stress Screening our assemblies. We are a captive house providing board
>assemblies for the process control industry.
>
>Our current ESS cycle is as follows:
>
>	Assemblies are elevated to 70°C in 5°C increments per minute.
>
>	Then they are dropped to 0°C
>
>	The cycle is repeated 12 times.
>
>	Power is applied to the assemblies in 5 minute increments, 5 min.
>on
>		then 5 min. off.
>
>My questions are:
>
>	Do other capitive assembly houses use a similisr test ?
>
>	Do contract assembly houses use a similiar test ?
>
>	If so, What resuts are expected and obtained ?
>
>	Are the tests performed based on some internal or external
>
>		requirements ?
>
>	Are the results utilized for further actions ?
>
>	If so, What actions ?
>
>Your help and feed back is greatly appreciated.
>
>Rich Ackerson
>Sr. Ind. Eng.
>Elsag Bailey Electronics
>[log in to unmask]
>
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Bill Marsh
Phone: 415-604-6979
e-mail: [log in to unmask]


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