Overview
ISO 7574-2:1985 - Acoustics: Statistical methods for determining and verifying stated noise emission values of machinery and equipment - Part 2: Methods for stated values for individual machines provides guidance for establishing and checking the labelled noise emission value for each individual machine. It covers statistical procedures for determining a machine’s declared noise value and a method to verify that a particular machine’s noise emission does not exceed its labelled limit. The standard assumes measurement by an accredited testing laboratory with appropriate facilities and trained staff.
Key topics
- Scope and purpose: Methods are specific to situations where each machine receives an individual labelled noise value (i.e., each unit has its own declared noise emission).
- Statistical approach: Uses statistical methods mainly to estimate parameters relevant to verifying labelled values (the document notes particular emphasis on estimation of the factor K - see clause 5).
- Compliance check: Defines a procedure for testing an individual machine to confirm its noise emission is at or below the labelled value (the labelled value is treated as a limit).
- Dependencies and definitions: Relies on general definitions and principles in ISO 7574/1 and references established sound power measurement methods (ISO 3741–3746 family and ISO 3744, ISO 3745, ISO 3746, ISO 3742, ISO 3743).
- Assumptions and limits: Does not address regulatory or contractual consequences if a machine fails verification; focused on the statistical verification method itself.
Applications
- Manufacturer labelling: For manufacturers who provide an individually-labelled noise emission value for each machine produced.
- Testing and conformity assessment: For acoustic laboratories and test houses conducting verification tests and issuing compliance reports.
- Procurement and contract testing: Used by buyers and contractors to confirm delivered machines meet declared noise limits.
- Quality control: Employed in production quality assurance when noise performance is tracked per unit.
- Regulatory support: Assists safety and environmental compliance teams in validating noise declarations for machinery.
Who should use this standard
- Acoustic engineers and testing laboratories
- Product compliance and certification bodies
- Manufacturers and R&D teams for machinery and equipment
- Procurement officers and quality managers
- Environmental health & safety professionals
Related standards
- ISO 7574-1 (General considerations and definitions)
- ISO 7574-4 (Methods for stated values for batches of machines)
- ISO 3741–3746 (Sound power determination methods)
- ISO 4871 (Equipment noise labelling)
Keywords: ISO 7574-2, acoustics, noise emission, statistical methods, individual machines, noise labelling, sound power levels, machinery noise verification.
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