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
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