Overview
EN ISO 11203:2009/A1:2020 (ISO 11203:1995/Amd 1:2020) is an amendment to the international/European acoustics standard for assessing noise emitted by machinery and equipment. It specifies how to determine emission sound pressure levels at a work station and at other specified positions derived from the sound power level of a machine. The amendment updates definitions, normative references and cross-references (e.g., to ISO 11200:2014) and was approved by CEN for national adoption across member bodies in 2020.
Key topics and requirements
- Scope: Relates to airborne sound radiated by a defined machine under specified operating and mounting conditions; measurements assume a reflecting plane surface and exclusion of background noise and unwanted reflections (unless permitted).
- Core definitions: Clear definitions of key acoustical quantities including:
- Emission (airborne sound radiated by the source)
- Emission sound pressure and emission sound pressure level
- Time‑averaged emission sound pressure level, peak emission sound pressure/level, and single-event emission sound pressure level
- Sound power and sound power level
- Measurement context: Emphasis on standardized measurement and controlled acoustic environments when determining emission quantities.
- Regulatory linkage: Annex ZA explains how the standard supports essential requirements of EU Machinery Directive 2006/42/EC (useful for conformity assessment and CE marking where cited in the Official Journal).
Applications
- Producing comparable noise data for product labels and technical specifications.
- Converting measured or declared sound power levels of machines into expected sound pressure levels at operator workstations and other positions.
- Supporting noise control design, workplace risk assessments and compliance with machinery noise requirements.
- Providing a standardized method for reporting emission metrics used in procurement, product development and occupational health evaluations.
Who uses this standard
- Machine manufacturers for product noise declarations and labeling.
- Accredited test laboratories performing sound power and emission measurements.
- Acoustic consultants and engineers conducting machine noise assessments and mitigation.
- Compliance and certification bodies assessing conformity with the Machinery Directive and related regulations.
- Occupational health & safety professionals evaluating worker exposure to machine noise.
Related standards
This amendment updates normative references and aligns with related ISO acoustics standards used for sound power and intensity measurement methods, e.g.:
- ISO 3740 series (sound power guidelines)
- ISO 3741, 3743-1, 3743-2, 3744, 3745, 3746, 3747 (sound power/measurement methods)
- ISO 9614-1/2/3 (sound intensity measurement)
Keywords: EN ISO 11203:2009/A1:2020, ISO 11203, noise emitted by machinery, emission sound pressure level, sound power level, machine noise measurement, Machinery Directive.