1 Scope
This International Standard
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— gives information on the declaration of noise emission values,
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— describes acoustical and product information to be presented in technical documents for the purposes of noise emission declaration, and
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— specifies a method for verifying the noise emission declaration.
It is applicable to machinery and equipment.
The values to be used for the purposes of noise emission declaration are either declared
single-number noise emission values, Ld, or declared dual-number noise emission values, L and K. L is a noise emission value determined directly from measurements and K is the uncertainty associated with those measurements. Ld is the sum of L and K and represents an upper limit which values from repeated measurements are unlikely
to exceed at a given confidence level; Ld corresponds to the stated or labelled value, Lc, defined in ISO 7574‑1.
The two forms of noise declaration are alternative means of representing any or all
of the A-weighted sound power level, LwA, the A-weighted emission sound pressure level at specified positions, LpA and the C-weighted peak emission sound pressure level at specified positions, LpC,peak. The choice as to which of the two forms is used in a particular case depends upon
the requirements to be fulfilled. This selection is made, and guidance on the values
of K is given, in the appropriate noise test code.
Guidelines for determining declared noise emission values are given in annex A.