Overview
EN ISO 11546-2:2009 (ISO 11546-2:1995) is a CEN/ISO acoustics standard that specifies in situ methods for determining the sound insulation performance (insertion loss) of machine enclosures. It applies to a complete enclosure only (not to individual panels such as doors or windows) and is intended for acceptance and verification measurements on installed equipment. The standard supports conformity assessment under relevant EU machinery Directives when applied within its scope.
Key topics and requirements
- Scope and applicability
- Measurement methods are for a total enclosure surrounding the actual noise source (machine). Alternative methods using an artificial sound source are given when the actual source cannot be used.
- Measurement objectives
- Quantify the enclosure performance in terms of sound power reduction or sound pressure level reduction (insertion loss).
- Measurement methods
- Procedures for measurements when the enclosure surrounds the actual sound source and for the artificial sound source method where necessary.
- Instrumentation and test conditions
- Requirements for instruments, test positions and environmental conditions are provided and reference related ISO measurement practice standards.
- Data handling
- Guidance on uncertainty estimation, information to be recorded during tests, and information to be reported in test reports.
- Annexes (informative)
- Annex A: design of an artificial sound source
- Annex B: example source spectrum
- Annex C: evaluating suitability of test environments for in situ work
- Annex D: estimating noise insulation for a given noise spectrum
- Annex E: bibliography and references
Applications and who uses it
EN ISO 11546-2 is intended for practical use by:
- Acoustic consultants and measurement laboratories performing on-site verification and acceptance tests
- OEMs and machine manufacturers validating enclosure performance on installed machinery
- Compliance and safety engineers demonstrating conformity with noise-related requirements under EU machinery directives
- Facility managers and maintenance teams assessing the effectiveness of sound enclosures in real operating conditions
Typical applications include field testing of acoustic enclosures, verifying claimed insertion loss during commissioning, and troubleshooting inadequate noise control.
Related standards
Key related ISO standards referenced for methods and instrumentation:
By following EN ISO 11546-2, practitioners can perform consistent, documented in situ sound insulation tests of machine enclosures and produce reliable results for acceptance, verification and regulatory compliance.