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--- articles:nist_traceability [2019/11/20 07:47] – [An "unbroken chain of calibrations" to what?] rrandall
+++ articles:nist_traceability [2019/11/20 07:52] – [An "unbroken chain of calibrations" to what?] rrandall
@@ Line 59: / Line 59: @@
 **FAA National Policy - Order 6200.4G** \\
 Appendix 2 - Definitions \\
-h. Calibration Standard - a device or instrument used as a basis to calibrate measure, gage, test, inspect, or otherwise examine basic accuracy values. The standard has a higher order of accuracy than the examined item and is traceable to the National Institute of Standards and Technology (NIST).</WRAP>
+h. Calibration Standard - a device or instrument used as a basis to calibrate measure, gage, test, inspect, or otherwise examine basic accuracy values. The standard has a higher order of accuracy than the examined item and is __traceable to the National Institute of Standards and Technology (NIST)__.</WRAP>
 In contrast, ISO 17025:2017 is much more modern and technically correct in stating:\\
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 [[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? =====
 {{ :articles:2018-si.png?direct&130|}}