INTERNATIONAL STANDARD ISO 14253 1.pdfl ((NEW))

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The fundamental principle of ISO 14253-1 is to put the measurement uncertainty intoaccount while making acceptance decisions based on measurement. Part 1 of ISO14253-1 prescribes the measurement uncertainty used for making decisions ofqualification. It is defined as the sum of the product of the uncertainty of the measurement device and the nominal validity of the measurement. The measurement uncertainty in testing is measured after calibration and the nominal validity ofthe measurement is set as the tolerances of the specification and definition ofqualification. Thus, the measurement uncertainty can be determined by reviewing the measurement result and the specification and qualification rule. The general determination rules of Part 1 of ISO14253-1 [4] are as follows.

The first model is a systematic and complete quality inspection model. The measurement uncertainty is to be determined by the manufacturer. This is logical, because it has been determined by the manufacturer.

The second model considers a worst case scenario. It is a model that is based on the manufacturer’s usual production practices and is usually used as the basis for qualification. The measurement uncertainty is determined by the manufacturer.

The third model considers a best case scenario. This is based on a one-off calibration with a complete and representative model calibration result. The measurement uncertainty is the theoretical best case scenario. d2c66b5586