Calibration may be required called for the following reasons:

  • a new instrument
  • after an instrument has been repaired or modified
  • when a specified time period has elapsed
  • when a specified usage (operating hours) has elapsed
  • before and/or after a critical measurement
  • after an event, for example
    • after an instrument has been exposed to a shock, vibration, or physical damage, which might potentially have compromised the integrity of its calibration
    • sudden changes in weather
  • whenever observations appear questionable or instrument indications do not match the output of surrogate instruments
  • as specified by a requirement, e.g., customer specification, instrument manufacturer recommendation.

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