This part of IEC62670 defines standard conditions for assessing the power produced by CPV systems and their photovoltaic subcomponents. The object of this part of IEC62670 is to define a consistent set of conditions so that power ratings noted on data sheets and nameplates will have a standard basis. Two sets of conditions are included to characterize: operating conditions that represent on-sun performance relative to commonly measured meteorological conditions, and test conditions that represent performance when the module is in a readily reproducible environment.