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An instrument's specification of accuracy applies

  • A.over a stated range of conditions and after a stated warm-up
  • B.under any conditions the user chooses to impose upon it
  • C.only on the day the instrument was calibrated
  • D.only at exactly full scale deflection

Answer: A

Temperature range, humidity, warm-up time, orientation and supply stability are all part of the specification, and using the instrument outside them invalidates the figure. Reading the small print before the measurement is what distinguishes a result from a number.

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