philippe_44 wrote: 
> Electronics manufacturers, we do burn-in (at elevated T° often) to cause
> early failure for components that have a potential problem. Wafer
> processes have variability and that creates transistors or metal layers
> not in spec. It's reliability and sorting, not to adjust parametrics

Why you've made the very point for me!
The point was not that burn in is done to "adjust parametrics".... but
rather...
During burn in... THINGS CHANGE!!!!

> To cause early failure for components that have a potential problem
It..(burn in) would not DO that..... if it didn't cause things to
change!!!!!!!!!!


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