Patrick, In your story, what you did was a small statistical study. Multiple samples allow you to do this. It is similar to the problems of EMC. One possibility is to test multiple units and record the results as a probability or simply record the worst case. When dealing with large expensive equipment that can take days to evaluate, it is far simpler to build confidence by simply adding, pause for effect, margin. Doug Douglas E Powell doug...@gmail.com http://www.linkedin.com/in/dougp01
Ahhh, our old friend: "Margin". Margin is one of those timeless EMC topics. IMHO- there is simply no evidence that margin is helpful. In a practical sense we all know that a "single-measurement-plus-margin" is not a confidence builder. As an example, think about the last time you worked on your home wiring. How many times did you read that multi-meter before you touched the wires? Did you read it just once? Then add some margin? Nope- I'll bet you did like me: I read that meter, and double-read it. Then I read it again. One measurement is simply not enough to build confidence. Next time someone asks you for "reasonable margin" ask them about their last wiring project.... -Patrick OOO. On Mon, Oct 12, 2015 at 2:54 PM, Douglas Powell <doug...@gmail.com> wrote:
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