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The uncertainty of a measurement made with a calibrated instrument includes

  • A.neither
  • B.the calibration uncertainty as well as the instrument's own error
  • C.only the instrument's specified error
  • D.only the calibration uncertainty

Answer: B

The correction from the certificate is itself uncertain, and that uncertainty is inherited by every measurement made with the instrument. It is one link in the traceability chain and has to be combined with the others.

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