Decision rules for conformity statements
Standards, specifications and other rules determine whether and in which form measurement uncertainties are included in the evaluation for conformity statements.
Type 1
Measurement uncertainty is determined on the basis of error propagation, theoretical and/or practical experience, statistical methods and, if necessary, by estimation.
When considering conformity, the measurement uncertainty is taken into account with the agreed confidence level in all cases.
Type 1a high confidence level
Type 1b low confidence level
Type 2
Determination of measurement uncertainty is not necessary, since main sources of measurement uncertainty are recorded and the form of presentation of calculated results takes place normatively.
Measurement uncertainty is not taken into account when considering conformity. Unless a value for measurement uncertainty is specified in the standard and consideration is required.
Type 3
A determination of the measurement uncertainty is not required, since the result of the test is not a measurement result in the sense of DIN EN ISO/IEC 17025.
Conformity is confirmed on the basis of the test result.