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Traceability of a measurement means

  • A.the ability to repeat the measurement at a later date
  • B.the instrument having been bought from an accredited supplier
  • C.an unbroken chain of comparisons back to a national standard
  • D.a record of every person who has used the instrument

Answer: C

Correct answer: an unbroken chain of comparisons back to a national standard

Traceability means every link in the chain is documented, each with its own stated uncertainty, so the measurement can be related to the national realisation of the unit. Buying from a reputable supplier is not traceability; a certificate naming the standards used and their uncertainties is.

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