48 The IEC 61400 series of standards addresses wind energy generation technical requirements up to 49 the point of interconnection with the utility grid system. Part 50 of the IEC 61400 series of standards 50 comprises a sub-set of standards which specify the requirements for equipment and methods to be 51 used in the measurement of the wind. 52 Wind measurements are required as inputs to various tests and analyses described in other use-case 53 standards in the IEC 61400 series (e.g. power performance, resource assessment, noise 54 measurement). Whereas those other standards define use-cases for wind measurements, Part 50 55 sets those wind measurement requirements which are independent of the use-case. Its purpose is to 56 ensure that wind measurements and the evaluation of uncertainties in those measurements are 57 carried out consistently across the wind industry and that wind measurements are carried out such 58 that the uncertainties can be quantified and that those uncertainties are within an acceptable range. 59 Part 50-0 provides a general introduction to the options that are available for wind measurement 60 which are further detailed in the other parts of the -50 series.