Does traceability to foreign national labs, such as, the United Kingdoms National Physical Laboratory (NPL), Germanys Physikalisch-Technische Bundesanstalt (PTB), and Canadas National Research Council (NRC), imply traceability to NIST?
The U.S. has many written agreements with foreign countries recognizing that, at the national laboratory level, we have the same units. For information and reference about international agreements between NIST and foreign agencies and organizations, visit the NIST Office of International and Academic Affairs (OIAA) web site. In addition to many bilateral agreements, NIST signed a multilateral Mutual Recognition Arrangement (MRA) through which most of the worlds National Metrology Institutes (NMI) recognize each other’s measurements. For information and reference about the MRA, visit the Bureau of Weights and Measures (Bureau Intrnational des Poids et Msures, BIPM) web site. Unfortunately, this does not necessarily translate to traceability. NIST cannot do much about this problem because the rules for traceability are enforced by other agencies. You have to consult with your specific auditor for the interpretation of traceability. In most countries, traceability is defined and interpret
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