V. Reliability Testing
C. Product Testing
Describe the purpose, advantages, and limitations of each of the following types of tests, and use common models to develop test plans, evaluate risks, and interpret test results.
4. Stress screening (e.g., ESS, HASS, burn-in tests) (Evaluate)
Shake out those latent defects just waiting to cause an early life failure.
Additional References
Quick Quiz
1-135. What is the main purpose of environmental stress screening?
(A) to subject parts to extreme conditions
(B) to reduce the possibility of supplier inspections
(C) to assist in the selection of standardized parts
(D) to eliminate infant mortality failures
(D) to eliminate infant mortality failures
Screening in not an efficient method to achieve product reliability, yet in certain circumstances it is necessary. If the risk of an unavoidable (thru design, quality, or control approaches) there is a risk of an unacceptable defect rate the use of stress screening may work to identify the units with defects before shipping to customers. In general, not always these defects are caused by component latent defects or assembly errors and would result in early life failures when placed into service.
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