BS EN 61400-11:2013+A1:2018 presents measurement procedures that enable noise emissions of a wind turbine to be characterised. This involves using measurement methods appropriate to noise emission assessment at locations close to the machine, in order to avoid errors due to sound propagation, but far away enough to allow for the finite source size. The procedures described are different in some respects from those that would be adopted for noise assessment in community noise studies. They are intended to facilitate characterisation of wind turbine noise with respect to a range of wind speeds and directions. Standardisation of measurement procedures will also facilitate comparisons between different wind turbines.Cross References:IEC 61672EN 60688IEC 61400-12-2IEC 60688EN 61672EN 61400-12-2IEC 61400-12-1:2005EN 61400-12-1:2006IEC 60942:2003EN 60942 (IEC 60942:2003) ASISO/IEC Guide 98-3EN 61260 (IEC 61260:1995 AS)IEC 61260:1995ISO 7196ISO 9613-1:1993IEC/TS 61400-14Incorporates the following:Amendment, October 2018