scope:

This standard specifies methods for measuring airborne acoustical noise emitted by electric refrigerators, frozen-food storage cabinets, food freezers and their combinations for household and stimilar uses, supplied from the mains or from batteries. The term "similar use" means "use under conditions timilar to those in a household", e.g. in cafés, restaurants, hotels and similar establishments. This standard does not apply to appliances, equipment or machines designed exclusively for industrial or commercial purposes. This standard is concerned with objective methods of engineering accuracy (engineering method, grade 2 according to ISO 2204) for determining sound power levels, L_w expressed in decibels with reference to a sound power of 1 pW, of airborne acoustical noise within the specified frequency range of interest, and for specified operating conditions of the appliance to be measured. The frequency range of interest includes the octave bands with centre frequencies between 125 Hz and 8000 Hz (this interval being, for practical reasons, narrower than the frequency range of audible sound).