WELMEC 4.2 Issue 1 (2006)

Elements For Deciding The Appropriate Level Of Confidence In Regulated
Measurements. (Accuracy classes, MPE in-service, nonconformity, principles of uncertainty)

This WELMEC document reflects the following issues:

• Accuracy classes of measuring instruments;
• The role and setting of maximum permissible errors (MPEs)
  in-service;
• Acceptable maximum rate of non-conforming instruments in use;
• Use of measurement uncertainty when assessing instrument conformity.