NF S31-078-1*NF EN 27574-1:1989 Acoustics. Statistical methods for determining and verifying stated noise emission values of machinery and equipment. Part 1 : general considerations and definitions.
1989NF S31-078-4*NF EN 27574-4:1989 Acoustics. Statistical methods for determining and verifying stated noise emission values of machinery and equipment. Part 4 : methods for stated values for batches of machines.