Components of a Calibration Certificate

Due Dates

Factors that may be used to determine the recalibration period, or calibration cycle, would be the amount of use, the way it is handled, and the degree of required accuracy.

Regular validation measurements can be used to monitor the drift of an instrument and to then determine its current accuracy. Using statistical analysis of calibration results and also of validation measurements, expected calibration intervals can be chosen and either shortened or extended as required.

It is therefore important that records be maintained of calibration, validation and maintenance work, and it may also be useful to restrict the use of the instrument only to suitably qualified persons.

ISO17025 (Section 5.10.4.4) discourages calibration laboratories from including a 'recalibration date' on a certificate unless it is approved by the client. Some government agencies will often specify a calibration interval thus defining the due date.

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