This document considers liquid atmospheric precipitation and defines the procedures and equipment to perform laboratory and field tests@ in steady-state conditions@ for the calibration@ check and metrological confirmation of liquid precipitation measurement instruments. It provides a classification of catching-type measurement instruments based on their laboratory performance. The classification does not relate to the physical principle used for the measurement@ nor does it refer to the technical characteristics of the instrument assembly@ but is solely based on the instrument calibration. Attribution of a given class to an instrument is not intended as a high/low ranking of its quality but rather as a quantitative standardized method to declare the achievable measurement accuracy in order to provide guidance on the suitability for a particular purpose@ while meeting the user??s requirements.
PREN 17277-2018 history
2018PREN 17277-2018 Hydrometry - Measurement requirements and classification of rainfall intensity measuring instruments