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articles:nist_traceability [2019/11/20 07:48]
rrandall [An "unbroken chain of calibrations" to what?]
articles:nist_traceability [2019/11/20 07:52] (current)
rrandall [An "unbroken chain of calibrations" to what?]
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 [[http://​www.isobudgets.com/​measurement-traceability-complying-iso-17025-requirements/​|{{ :​articles:​measurement-traceability-pyramid-600px.jpg?​direct }}]] [[http://​www.isobudgets.com/​measurement-traceability-complying-iso-17025-requirements/​|{{ :​articles:​measurement-traceability-pyramid-600px.jpg?​direct }}]]
  
-I describe the above pyramid as "//​typical//"​ because, contrary to the antiquated language of ISO 9001:2015 & AS9100:​2016,​ it is possible to “bypass” the National Metrology Institutes (NMIs) to obtain traceability to SI units. Using the example of DC volts, [[https://​www.fluke.com|Fluke]],​ a world leader in the field of metrology, owns a [[https://​nvlpubs.nist.gov/​nistpubs/​jres/​095/​jresv95n3p219_A1b.pdf|Josephson voltage system]], which they can use to realize the SI Units directly.+I describe the above pyramid as "//​typical//"​ because, contrary to the antiquated language of ISO 9001:2015 & AS9100:​2016,​ it is possible to “bypass” the National Metrology Institutes (NMIs) to obtain traceability ​directly ​to SI units. Using the example of DC volts, [[https://​www.fluke.com|Fluke]],​ a world leader in the field of metrology, owns a [[https://​nvlpubs.nist.gov/​nistpubs/​jres/​095/​jresv95n3p219_A1b.pdf|Josephson voltage system]], which they can use to realize the SI Units directly.
 ===== What are SI Units? ===== ===== What are SI Units? =====
 {{ :​articles:​2018-si.png?​direct&​130|}} {{ :​articles:​2018-si.png?​direct&​130|}}