Environmental Stress Screening. Revision A.
Environmental Stress Screening. Revision A.

Author: A. E. Saari

Publisher:

Published: 1986

Total Pages: 160

ISBN-13:

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Environmental Stress Screening is now being employed throughout the defense industry as a means of precipitating latent part and workmanship defects prior to fielding, with the expectation that improved field reliability and reduced support costs will result. The objective of this study was to develop a quantitative technique for planning, monitoring and controlling the cost effectiveness of stress screening programs for electronic equipment and to prepare a draft military standard based on the developed technique. Latent defects are introduced in equipment through defective parts and deficiencies in the manufacturing assembly process. Design related defects, though not insignificant, are not considered in the techniques developed. Stress screens act on part and workmanship defects with resulting fallout, but since screens are less than 100% effective, some defects escape in fielded equipment. A method for estimating the number of defects initially present was developed and is described later. The effectiveness of stress screens is measured by test strength determined from screening strength equations developed in a previous study and updated in this study based on acutal screening results and test detection efficiency. The question of what is a reasonable number of defects to escape is addressed based on equipment complexity and a tradeoff of stress screening cost and resulting field reliability.

Environmental Stress Screening
Environmental Stress Screening

Author: Dimitri Kececioglu

Publisher: DEStech Publications, Inc

Published: 2003

Total Pages: 558

ISBN-13: 9781932078046

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Environmental stress screening (ESS) has become one of the primary approaches in the modern electronic industry to precipitate and eliminate latent or hidden defects in electronic products which are introduced mainly during the manufacturing, assembling and packaging processes. Temperature cycling, plus random vibration (shaking and baking) are the primary processes of ESS. This text presents coverage of the subject, from basic concepts and the historical evolution of ESS, to the statistical and physical quantification of ESS.

Environmental Stress Screening Guidelines
Environmental Stress Screening Guidelines

Author: Department of defense washington dc

Publisher:

Published: 1993

Total Pages: 48

ISBN-13:

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Our urgent requirements to improve the operational performance of weapon systems while reducing their operating and support costs can be met only by improving their quality and reliability. Environmental stress screening (ESS) has been shown to be a significant aid towards meeting these objectives. This document is the culmination of work that began in the mid-1980s when industry, with Government encouragement, initiated the revision and improvement of existing Government ESS guidelines.

Environmental Stress Screening Handbook
Environmental Stress Screening Handbook

Author: John J. Quinn

Publisher:

Published: 2004

Total Pages: 160

ISBN-13: 9781418428198

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Why read this book on Environmental Stress Screening ? If you are working in the electronic manufacturing industry and you have heard the questions : "Why did it fail in the field and not in the factory ?" The answer to this question is there was not a proper ESS program developed for this product. A good ESS program is develop from the ground up and the fallout data is tracked. The fallout data is used to alter the present ESS program. This new /altered program is tailored to the hardware and usually is less costly and should improve the product reliability. "Why can't we use the same ESS program as the other guy ?" The answer to this is you can, if you are manufacturing the exact same product. If this is the case, you must be working with the other guy. A different product requires a different ESS program. Or If you are working in the electronic manufacturing industry and you have heard the statements : "I won't do ESS, it's going to cost too much." Can you put a price on field returns or lost contracts because of poor quality ? "I don't need to ESS, I'll just be more careful during manufacturing." You can be as careful as you want. If you don't weed out the Latent defects the time bomb is ticking. Or (worst case condition) If you are working in the electronic manufacturing industry and you have heard the front door being locked for the last time because of poor Quality hardware being shipped to the customer: Unfortunately if this happens it is too late to do anything. Hopefully you will develop a strong ESS program that is cost effective, apply dynamic management of the ESS program by analyzing the fallout data and last but not least - use common sense.