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A working standard is one that

  • A.is carried between national laboratories for intercomparison
  • B.is used for the routine calibration of instruments
  • C.realises the unit from its definition without reference to any other
  • D.is kept sealed and never used except to check a secondary standard

Answer: B

Correct answer: is used for the routine calibration of instruments

The working standard is the bottom of the chain and the one that does the daily work, checked against a secondary standard at intervals. Because it is in constant use it is expected to drift, which is why the interval between its own calibrations is a matter of documented policy.

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