EN ISO 3743-1:2010 PDF

Overview

EN ISO 3743-1:2010 (CEN adoption of ISO 3743-1:2010) is an engineering-grade acoustics standard for determining sound power levels and sound energy levels of small, movable noise sources using sound pressure measurements. It specifies a comparison method carried out in a prescribed hard-walled test room (reverberant field) where measured sound pressure from the test source is compared to a calibrated reference sound source. Results are reported in one-octave frequency bands and can be combined into A-weighted levels.

Key topics and technical requirements

• Scope and test environment
  • Applicable to small, portable devices, machines, components or sub-assemblies mounted in a hard-walled test room with specified acoustical characteristics.
  • Not intended for large stationary equipment that cannot be moved into the test room.
• Types of noise covered
  • Suitable for steady, non-steady, fluctuating, transient or burst noise as defined in ISO 12001.
• Measurement basis
  • Comparison of octave-band sound pressure levels between the test source and a calibrated reference source to derive sound power or sound energy.
  • Option to calculate A-weighted sound power/energy from octave-band results (see normative Annex B).
• Instrumentation & procedures
  • Requirements for instrumentation, microphone positions and measurement procedure are defined (see clauses on instrumentation and measurement procedure).
• Uncertainty and accuracy
  • Measurement uncertainty guidance is provided; the method is classified accuracy grade 2 (engineering grade) in accordance with ISO 12001:1996.
  • Annex C gives informative guidance on assessing uncertainty; Annex A addresses reference meteorological conditions.

Applications and who uses this standard

• Acoustic test laboratories performing in-room sound power measurements for portable equipment.
• Manufacturers validating product acoustic performance and preparing noise data for datasheets.
• Design and R&D teams assessing noise from components or sub-assemblies during development.
• Compliance and certification bodies using the method as part of demonstrating conformity with machinery safety directives and related EU requirements (see Annex ZA).
• Typical uses: product noise labelling, comparative testing, noise control engineering and product optimization for small movable machinery.

Related standards

• ISO 3740–3747 series (selection guidance for methods to determine sound power)
• ISO 12001 (noise types, uncertainty classification)
• ISO 3741 or ISO 9614 - referenced when higher accuracy or different test environments are required
• ISO 6926 (requirements for reference sound sources)

Keywords: EN ISO 3743-1:2010, acoustics standard, sound power levels, sound energy levels, sound pressure, reverberant field, hard-walled test room, comparison method, A-weighting, measurement uncertainty, engineering grade.