This standard contains mathematical expressions and procedures
that must be implemented for correctly assessing uncertainty
affecting measurements on power systems. The document relies on
the instrumentation typically used, with particular focus on
digital instrumentation, and addresses typical kinds of
uncertainty sources. The theory reported in the Standard ISO/IEC
Guide 98-3:2008 Uncertainty of measurement -- Part 3: Guide to
the expression of uncertainty in measurement (GUM:1995) and
supplements is used as background for expressing the
relationships to be used for the evaluation of the uncertainty
in measurements on power systems. The guidelines developed in
this document can be used to evaluate uncertainty budget when
performing the measurement of a given quantity on electric power
systems as well as to correctly write their value in official
documents like specifications and test reports. This document
contains a variety of examples to deeply discuss and explain the
provided guidelines. The concepts pre