Calibration may be called for:
1. After equipment has been repaired or modified.
2. When a specified time period has elapsed.
3. When a specified usage (operating hours) has elapse.
4. Before and/or after a critical measurement.
5. After an event, for example:
a)After the equipment has had a shock, vibration, or has been exposed to an adverse condition which potentially may have put it out of calibration or damage it.
b)Sudden changes in weather.
c)Improper use of software to cause the loss of the calibration data.
6. Whenever observations appear questionable or equipment indications do not match the output of surrogate instruments.
7. As specified by a requirement, e.g., customer specification.
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