Calibration Due Dates - Daily or End of the Month?

Much of the test equipment in-use today requires periodic calibration. This is done to ensure a high probability that the equipment will remain in tolerance by the due date or end of the calibration interval. The majority of calibration intervals are monthly with common intervals every 3 months (3, 6, 9, 12, etc.) The calibration interval is based on many factors which this paper will not address. But when, exactly, should the equipment be due? And by due calibration, we mean that it is taken out of service to be calibrated. The purpose of this paper is to examine when (specifically) the equipment is required to be removed from service for calibration. Two of the most popular methods is the day of the month (daily) and end of month due date. But which is better for you? This paper will examine the pros and cons of each method so you can decide which is best for your situation.