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articles:nist_traceability [2020/01/23 10:03] – [Traceability to Organizations, rather than SI Units] rrandall | articles:nist_traceability [2020/06/07 17:20] – [An "unbroken chain of calibrations" to what?] rrandall | ||
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Sec. 820.72 Inspection, measuring, and test equipment. \\ | Sec. 820.72 Inspection, measuring, and test equipment. \\ | ||
(b) (1) Calibration standards. Calibration standards used for inspection, measuring, and test equipment shall be __traceable to national or international standards__. If national or international standards are not practical or available, the manufacturer shall use an independent reproducible standard. If no applicable standard exists, the manufacturer shall establish and maintain an in-house standard.</ | (b) (1) Calibration standards. Calibration standards used for inspection, measuring, and test equipment shall be __traceable to national or international standards__. If national or international standards are not practical or available, the manufacturer shall use an independent reproducible standard. If no applicable standard exists, the manufacturer shall establish and maintain an in-house standard.</ | ||
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+ | Similar antiquated language appears in MIL-STD-1309D, | ||
+ | <WRAP center round box 80%> | ||
+ | 3.1.653 Traceability. The ability to relate individual measurement results to __national standards or nationally accepted measurement systems__ through an unbroken chain of comparisons. | ||
+ | </ | ||
In contrast, ISO 17025:2017 is much more modern and technically correct in stating:\\ | In contrast, ISO 17025:2017 is much more modern and technically correct in stating:\\ | ||
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Also, while not strictly speaking a National Metrology Institute (NMI), the [[https:// | Also, while not strictly speaking a National Metrology Institute (NMI), the [[https:// | ||
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+ | Transcat has an excellent White Paper on this topic at: [[https:// | ||
===== What are SI Units? ===== | ===== What are SI Units? ===== | ||
{{ : | {{ : | ||
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NIST, for example, is a non-regulatory agency of the United States Department of Commerce. When the US Government was "shut down" during 1995, 2013, 2018, and 2019, NIST operations were suspended. So if your company had measurement standards at NIST awaiting calibration, | NIST, for example, is a non-regulatory agency of the United States Department of Commerce. When the US Government was "shut down" during 1995, 2013, 2018, and 2019, NIST operations were suspended. So if your company had measurement standards at NIST awaiting calibration, | ||
- | To avoid this, standards writing bodies and regulatory agencies should gain a better understanding of " | + | To avoid this, standards writing bodies and regulatory agencies should gain a better understanding of " |
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For more information visit: [[https:// | For more information visit: [[https:// |