This part of ISO 21940 specifies the requirements for the following:


a) identifying errors in the unbalance measuring process of a rotor;


b) assessing the identified errors;


c) taking the errors into account.


This part of ISO 21940 specifies balance acceptance criteria, in terms of residual unbalance, for both directly


after balancing and for a subsequent check of the balance quality by the user.


For the main typical errors, this part of ISO 21940 lists methods for their reduction in an informative annex.