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The calibration interval of an instrument is decided from

  • A.its observed drift and the consequence of an error
  • B.the date it was purchased and nothing else
  • C.the number of readings taken with it since the last calibration
  • D.the resolution of its display or scale

Answer: A

An instrument that has proved stable over several cycles can have its interval extended, and one whose reading matters greatly is recalibrated more often. Fixing every interval at a year regardless is convention rather than reasoning.

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