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Electronics, Temperature and Age
Posted by Roger (more from Roger) on Fri, 18 Apr 2003 08:45:01
In Reply to: Question re: DI, PLC, Fri, 18 Apr 2003 08:02:08
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You are correct that electronics can fail at an early age (that's why I kept the old one as a spare), but their rate of failure is typically extremely low and then increases dramatically at a certain point of age. I believe Statisticians use an Exponential Curve or "bath tub curve" to model this failure mode.
At my accumulated mileage I felt it was a prudent decision to replace now rather than wait for failure. If I had been able to acquire a used unit at a favorable price I may have bought that for a spare and just used the original unit until failure. The individuals selling the few used units I could find wanted nearly the same price as the discounted price of a new unit. The provenance of these used units also troubled me.
posted by 68.42.114...
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