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| articles:nist_traceability [2019/11/20 07:52] – [An "unbroken chain of calibrations" to what?] rrandall | articles:nist_traceability [2020/01/15 15:06] – [An "unbroken chain of calibrations" to what?] rrandall |
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| 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. | 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. |
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| | Also, while not strictly speaking an NMI, the BIPM offers [[https://www.bipm.org/en/bipm-services/|calibration & Measurement services]] (with traceability to SI Units) to Member States. |
| ===== What are SI Units? ===== | ===== What are SI Units? ===== |
| {{ :articles:2018-si.png?direct&130|}} | {{ :articles:2018-si.png?direct&130|}} |
