The uncertainties associated to classes B, C and D haven’t a so direct link to technical “official” documents, nor typical users’ requirements. Class B uncertainties are derived from the experience of some meteorological services and are a compromise between the best achievable and an affordable system. Class C uncertainties have been defined mainly by expanding the class B uncertainties by a factor of 2. Class D uncertainties are by definition larger than class C uncertainties. The criteria indicated deal with the contribution of the instruments to the measurement uncertainty.
The uncertainties associated to classes B, C and D haven’t a so direct link to “official” technical documents, nor typical users’ requirements. Class B uncertainties are derived from the experience of some meteorological services and are a compromise between the best achievable and an affordable system. Class C uncertainties have been defined mainly by expanding the class B uncertainties by a factor of 2. Class D uncertainties are by definition larger than class C uncertainties. The criteria indicated deal with the contribution of the instruments to the measurement uncertainty.
CIMO_A1-A2-Doc_4.3%20Sustaind%20performance%20Surface%20Classification_as_published.docx