![]() ![]() It defines calibration as the: ".high-level, controlled and documented process of obtaining measurements on traceable calibration standards over the full operating range of the gage, then making the necessary gage adjustments (as required) to correct any out-of-tolerance conditions. Calibration in the Coatings Inspection IndustryĪSTM D7091 describes the use of magnetic eddy current gages for dry film thickness and is typical of many standards. Here ISO, ASTM, SSPC and other generally agree. It's not surprising that explanations differ given the challenges of defining a word used in many industries for many types of instruments.Ī simpler approach is to explain calibration terms as they pertain to a specific industry segment, in this case, the protective coatings industry. They would be surprised to learn that, not only can they not calibrate their gage themselves, but there is usually no fixed recalibration interval either.įor an indication of how challenging it is to define calibration terms, one needs to look no further than the myriad of definitions available from major organizations. ![]() There's a good chance someone you know misunderstands the terms Calibration and Calibration Interval as they relate to the coating inspection industry. The word "calibration" has different meanings depending on the industry or setting in which it is used. Ensuring Accurate Instrument Readings Part 1: Calibration What is Calibration? ![]() The importance of a 'long form' Calibration Certificate, who can perform a calibration, and the applications that may require field adjustments will also be discussed. In this paper, these often-misunderstood steps are explained as defined by ASTM D7091 1, ISO 2808 2 and SSPC-PA 2 3. Even high-quality electronic instruments can yield incorrect measurements if three key steps are not followed: Calibration, Verification, and Adjustment. Measuring physical parameters such as coating thickness, surface profile, and dew point is a common task for inspectors and applicators. However, those measurements are only as accurate as the instrument that performs them. ![]()
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