Some facts about environmental stress screening

This paper describes environmental stress screening experiments performed at Hughes Aircraft Company during the past three years. The experiments performed at the module level involved large numbers of production hardware. Data is presented indicating techniques for selecting environments and optimizing stress levels and duration for the screening of module level assemblies. The differences in screen results are discussed as to hardware and manufacturing processes. Also, some results tend to refute some intuitive ideas that are the rationale for some current screening practices.