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General Engineering
When does the calibration uncertainty contribute to a measurement uncertainty?
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[QUOTE="fonz, post: 6380763, member: 379378"] Hi thanks for the reply. That is essentially my understanding and I think that the common requirement for a Test Accuracy / Uncertainty Ratio of 4:1 or even 10:1 validates your statement. It has got me thinking though. When considering the uncertainty of a measurement made by an instrument with a known calibration. Is is correct to assume the error quoted by a calibration certificate can be considered a standard uncertainty or expanded uncertainty and if so, at what level of confidence? For example, I have shown an image of a typical calibration chart for a pressure sensor. The calibration tolerance is shown in blue, and the calibration points highlighted in green along with the error bars representing the uncertainty of the calibration itself. Is it correct to say that the contribution of uncertainty due to the accuracy of this device on any measurement made by it is within +/-2% of span? If so, at what level of confidence? [ATTACH type="full"]267886[/ATTACH] [/QUOTE]
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Forums
Engineering
General Engineering
When does the calibration uncertainty contribute to a measurement uncertainty?
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