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| articles:nist_traceability [2019/01/26 14:32] – [An "unbroken chain of calibrations" to what?] rrandall | articles:nist_traceability [2019/01/26 14:45] – [An "unbroken chain of calibrations" to what?] rrandall |
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| a. calibrated or verified, or both, at specified intervals, or prior to use, against measurement standards __traceable to international or national measurement standards; when no such standards exist, the basis used for calibration or verification shall be retained as documented information__;//" | a. calibrated or verified, or both, at specified intervals, or prior to use, against measurement standards __traceable to international or national measurement standards; when no such standards exist, the basis used for calibration or verification shall be retained as documented information__;//" |
| </WRAP> | </WRAP> |
| Unfortunately, the language in ISO 9001:2015 & AS9100:2016 (Rev. D) is extremely antiquated in stating its requirements for "measurement traceability". In contrast, ISO 17025:2017 is much more modern and technically correct in stating:\\ | Unfortunately, the language in ISO 9001:2015 & AS9100:2016 (Rev. D) is extremely antiquated (by about 55 years) in stating its requirements for "measurement traceability". In contrast, ISO 17025:2017 is much more modern and technically correct in stating:\\ |
| <WRAP center round box 80%> | <WRAP center round box 80%> |
| **ISO 17025:2017, “General requirements for the competence of testing and calibration laboratories”** \\ | **ISO 17025:2017, “General requirements for the competence of testing and calibration laboratories”** \\ |
| ===== What are SI Units? ===== | ===== What are SI Units? ===== |
| {{ :articles:2018-si.png?direct&130|}} | {{ :articles:2018-si.png?direct&130|}} |
| The "[[https://www.bipm.org/en/measurement-units/|International System of Units]]" (//Système International d'Unités//, with the international abbreviation SI) consists of 7 base units that define 22 derived units. With the exception of the kilogram, the base SI units are all derived from intrinsic (i.e., invariant) constants of nature, such as the speed of light in vacuum and the [[https://en.wikipedia.org/wiki/Boltzmann_constant|Boltzmann constant]] (which serves as the basis for the Kelvin temperature scale). According to Dr. Chris Sutton, "[[https://www.sciencelearn.org.nz/resources/1872-non-si-units|the SI system of units allows for complete coverage of all scientific measurements]]". \\ | Adopted by the [[https://en.wikipedia.org/wiki/General_Conference_on_Weights_and_Measures|General Conference on Weights and Measures (CGPM)]] in 1960, the "[[https://www.bipm.org/en/measurement-units/|International System of Units]]" (//Système International d'Unités//, with the international abbreviation SI) consists of 7 base units that define 22 derived units. With the exception of the kilogram, the base SI units are all derived from intrinsic (i.e., invariant) constants of nature, such as the speed of light in vacuum and the [[https://en.wikipedia.org/wiki/Boltzmann_constant|Boltzmann constant]] (which serves as the basis for the Kelvin temperature scale). According to Dr. Chris Sutton, "[[https://www.sciencelearn.org.nz/resources/1872-non-si-units|the SI system of units allows for complete coverage of all scientific measurements]]". \\ |
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| The SI Units are defined in the [[https://www.bipm.org/en/publications/si-brochure/|SI Brochure]], which is published by the [[https://www.bipm.org/en/about-us/|“Bureau International des Poids et Mesures” (BIPM)]], located in France. | The SI Units are defined in the [[https://www.bipm.org/en/publications/si-brochure/|SI Brochure]], which is published by the [[https://www.bipm.org/en/about-us/|“Bureau International des Poids et Mesures” (BIPM)]], located in France. |
