ASA - ANSI/ASA S12.61
AMERICAN NATIONAL STANDARD Declaration and Verification of Noise Emission Values of Machinery, Equipment, and Products
|Publication Date:||31 July 2020|
This Standard specifies:
• the noise emission values to be declared and the requirements for their presentation,
• product information that should accompany the declared noise emission values,
• the method for determining the mean A-weighted sound power level, LWA,m, for a batch of machines, equipment, or products,
• the method for optionally determining the mean A-weighted emission sound pressure level, LpA,m, for a batch of machines, equipment, or products
• the method for optionally determining the total standard deviation, σt, for the batch if this quantity is to be declared (e.g., if required by a regulation, standard, or test code citing this Standard).
• the method for verifying the noise emission values that are declared by manufacturers and other product suppliers.
This Standard is applicable to commercially available products that emit noise, including consumer products and household appliances, information technology products, industrial equipment, outdoor equipment and construction machinery, and other products. The term "machinery, equipment, and products" is used in this Standard to include all such products. In general, and at the time of its initial publication, this Standard does not apply to transportation vehicles (cars, motorcycles, trucks, trains, planes) or other moving equipment, but its Scope and requirements may be extended to such products if relevant test codes are developed and published that apply the methods of noise emission declaration and verification herein to such equipment and products. The uniform declaration methods in this Standard use, when required and unless otherwise specified in relevant test codes, noise emission data obtained in accordance with standards in the ANSI S12.5x series or ANSI S12.12 for determining the sound power levels of noise sources, and optionally ANSI/ASA S12.43 and ANSI/ASA S12.44 for determining emission sound pressure levels at specified positions.
The basic noise emission value to be declared is the mean A-weighted sound power level, LWA,m. This may optionally be supplemented by the mean A-weighted emission sound pressure level at the operator or bystander positions, LpA,m. These declared values are arithmetic mean values based upon measurements on a random sample of units taken from a production batch or lot of the machinery, equipment, or products being declared.
In addition to these noise emission quantities, the standard deviation of the noise emission values for the batch being declared is often needed (see Note 1 in Clause 5.4 for discussion.) It is therefore recommended, but left optional, that the total standard deviation (see 3.16) also be declared.
The mean A-weighted sound power level for the batch of machines permits comparison of the noise emission levels between similar products and permits predictions of installation or work-place noise immission levels in spaces where such products are to be located.
Although the most useful quantity for calculating immission levels due to one or more sound sources is the A-weighted sound power level of the individual source(s), the A-weighted emission sound pressure level may also be useful in estimating the immission level in the immediate vicinity of an isolated piece of equipment.
NOTE 1 This Standard is not applicable to, and does not provide for, the verification of the A-weighted emission sound pressure level.
NOTE 2 This Standard does not include procedures for either the declaration or verification of the noise emission levels for a single, individual unit of machinery or equipment but only for batches of machinery, equipment, or products (see definition 3.3). If an individual machine or unit is to be provided with its own noise emission declaration and subsequently subject to verification, guidance and procedures for so doing may be found in ANSI S12.3.