ISO 7779, Acoustics - The measurement of airborne noise emitted by information technology and telecommunications equipment, specifies procedures for measuring and reporting the noise emission of information technology and telecommunications equipment.
The basic emission amount is the A-weighted sound power level that can be used to compare equipment of the same type but from different manufacturers or to compare different equipment.
Three key noise emission standards are specified in ISO 7779:2010 for determining sound power levels to avoid unnecessary restrictions on existing facilities and experience. ISO 3741 specifies comparison measurements in a reverberation test chamber; ISO 3744 and ISO 3745 specify measurements in essentially free space on a reflective plane. Any of these three basic noise emission standards can only be selected and used in accordance with ISO 7779:2010 when determining the sound power levels of a machine.
The A-weighted sound power level is complemented by the A-weighted emission sound pressure level determined at the operator position(s) or spectator positions according to the basic noise emission standard ISO 11201. This sound pressure level is not an employee's emission rating. level, but can help identify potential problems that could cause discomfort, activity interference, or hearing damage for operators and bystanders.
Methods for determining whether the noise emission contains pronounced discrete tones or is impulsive in character are specified in the appendices. ISO 7779 is suitable for type testing and provides manufacturers and testing laboratories with methods to achieve comparable results.
The methods specified in ISO 7779 allow noise emission levels to be determined for an individually tested functional unit. The procedures apply to equipment that emits noise or impulsive noise that includes broadband noise, narrowband noise, and discrete frequency components.
The resulting sound power and emission sound pressure levels can serve for noise emission declaration and comparison purposes.
If the sound power levels achieved for several functional units of the same production batch are determined, they can be used to determine a statistical value for that production batch. Designed for noise measurement, ISO 7779 is also often incorrectly used for noise declaration. This is sometimes simply due to a lack of information, and sometimes because customers are misled into believing that the noise values of the products are better than they actually are.
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