HASS (Highly Accelerated Stress Screening) is used in the production stage to uncover defects and flaws in the manufacturing process by applying tri-axial (omni-axial) vibration and rapid temperature changes. It differs from a traditional test and should be considered a process in which to improve quality and reduce warranty costs.Equipment Required:
Vibration
Quasi-Random, Omni-Axial Vibration Table
6 degrees of freedom (three transitional, three rotational)
Frequency Range: 5- 5000Hz up to 90 gRMS
(2K - 10K Hz only for specialty items: for most items testing
in this frequency range would be useless and/or counterproductive)
Thermal
Liquid Nitrogen Cooled Thermal Chamber
30 to 200deg C per minute
Range: -100 to +200 deg C
Other Requirements
Test Plan
Fixturing
Monitoring
Where:
Testing in-house or outsource
Example HASS Cost Savings
A leading power supply company found their typical 3
hour HASS cycle was equivalent to 125 hours of static
burn-in. Finding die cracks, poor wire bonds and cold solder joints.
E-mail:
solutions@scrsys.com
