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Session:

5A - Uncertainty Analysis IV 

Date & Time:

Tuesday August 8, 2:30 PM - 4:00 PM

Paper Title:

k=3.9 ? . . . Why Not ?? 

 

 

Speaker:

Howard Zion, Director of Technical Operations  

CoAuthors:

Speaker Info

Company:

Transcat, Inc.

Address:

35 Vantage Point Drive
Rochester, NY, 14624, United States

Phone:

585-352-9720

Email:

hzion@transcat.com 

 

 

Abstract:

This paper will begin with an elementary review of the differences between TAR and TUR, underscoring the reasons for ISO-17025 and the GUM. In the discussion on TUR, a demonstration of the application of k=2 will be presented with respect to the UUT's tolerance. Previous NCSLI papers discussing "Indeterminate" calibration results will be addressed and quantified, illustrating the probability that a reading may indeed be out of tolerance (OOT). When attempting to determine this probability using k=2 for the reporting of a TUR, a problem arises if the entire area under the Normal Probability Density Function is not considered: the result is a misrepresentation of the OOT probability. This will lead to the concept that, although k=2 is a good reporting format for the uncertainty of a measurement, TURs should be standardized using k=3.9. It is the author's hope that this will spark discussion that will take the Metrology industry to the next step in tackling this "Indeterminate" area.  

 

 

 

 

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