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A secondary standard is one that

  • A.is calibrated against a primary standard and held in a laboratory
  • B.realises the unit directly from its definition
  • C.is used for the routine calibration of production instruments
  • D.is built into every instrument as a reference

Answer: A

Correct answer: is calibrated against a primary standard and held in a laboratory

The secondary standard is the intermediate link: it is compared periodically against a primary standard and then serves as the reference within its own laboratory. The hierarchy exists so that the primary standard is disturbed as little as possible while accuracy still propagates down the chain.

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