Metrology and analysis

Which pair correctly names a measuring instrument's property of "small spread when measuring the same thing repeatedly" and that of "measured values being close to the true value"?

  1. ASensitivity and resolution
  2. BSpeed and capacity
  3. CPrecision (repeatability) and accuracy
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Answer: C. Precision (repeatability) and accuracy

Small spread on repeated measurements is called precision, and closeness of measured values to the true value is called accuracy. Even with small spread, measurements offset from the true value are not accurate. Calibration and reference standards are used to manage both.

  • A. Sensitivity and resolution are different properties.
  • B. Speed and capacity are not metrology accuracy terms.
  • C. Correct. Precision (spread) and accuracy (closeness to truth).
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