Dear Technical Representative,
     
     Do you know of any specifications that outline the need to moisture 
     bake multilayer (PTH,SMT,or mixed technology) PCB's?  I am trying to 
     conduct a literature search on such requirement.  I have concluded, so 
     far, that moisture baking boards prior to assembly was a preventive 
     method used to minimize yield problems such as blow-holes on boards 
     subjected to high humidity for several months.  Which leads to another 
     question how is high humidity defined?  How long should a board be 
     stored prior to use?
     
     
     Wil McCray
     AMETEK Aerospace
     607-763-4745

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