Small Changes, Big Results

Abstract:The highly accelerated stress screen (HASS) is a method of finding the early life defects of a product. Alone, a HASS profile has limited value, as the profile will not catch all defects and in the process of determining defects, it may also create new defects or damage a product. Therefore, HASS tuning may be required to find the smaller or rarer defects for any given product. HASS tuning first requires a highly accelerated life test (HALT) that puts the products under specific stresses to try and find defects, and then a new HASS profile can be created. To ensure that the HASS profile detects any defects, a proof of screen or seeded failure test must be performed on current known failures to see if the HASS profile finds them. Once that is done, a safety of screen test is done to decide if the HASS profile puts undue stress on a product. HASS tuning requires many cycles of tests be done and tweaked as new defects arise, but these tests will increase the reliability of products over …

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