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Why perform interval analysis and adjustment? Usually, this requirement is driven by the need to maintain a specific level of measurement quality in a cost effective calibration program.
No measurement is perfect. There is always a risk the end result will be outside the desired tolerance. This is because measurement standards, no matter how good, have an associated uncertainty. Even at "time zero", which we call the Beginning-of-Period, this uncertainty still exists. This uncertainty increases as a function of time, usage, storage conditions, etc. The point where risk of being out-of-tolerance becomes unacceptable or where uncertainty becomes too great is the End-of-Period. Calibration should take place just prior to this point being reached.
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