This part of ISO 9902, taken together with ISO 9902-1, specifies the mounting, operating and measuring conditions required for the measurement, declaration and verification of noise emitted by spinning preparatory and spinning machinery. It is applicable to engineering (grade 2) and survey (grade 3) methods, in accordance with the International Standards to which it makes normative reference, and to machines of different types used as defined in ISO 2187 for — opening, cleaning and blending, — wool scouring, — baling, — carding, — tow cutting and stretch breaking, — spinning preparation subsequent to carding, and — spinning.