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定義
各段階で不確かさが明示された、測定結果を国家または国際測定標準に結びつける途切れのない校正の連鎖。
解説
A factory floor caliper is calibrated against a reference gauge block, which was calibrated against a master gauge block, which was calibrated at a national metrology institute (such as NIST in the US) against the SI meter definition. Each step in this chain has a calibration certificate with quantified uncertainty. Without traceability, measurements from different facilities cannot be reliably compared.
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