BS EN ISO 11546-2:2009

Foreword
1 Scope
2 Normative references
3 Definitions
4 Choice of measurement method
5 Instrumentation
6 Test methods applicable to enclosures with the
   actual sound source
7 Test methods applicable to enclosures without the
   actual sound source
8 Uncertainty
9 Information to be recorded
10 Information to be reported
Annex A (normative) - Artificial sound source
Annex B (informative) - Example of a source spectrum
Annex C (informative) - Guidelines for evaluating the
        applicability of different test environments
        for in situ measurements
Annex D (informative) - Estimated noise insulation due to the
        enclosure for a specific noise spectrum
Annex E (informative) - Bibliography
Annex ZA (informative) - Relationship between this European
         Standard and the Essential Requirements of EU
         Directive 98/37/EC
Annex ZB (informative) - Relationship between this European
         Standard and the Essential Requirements of EU
         Directive 2006/42/EC

Describes in situ methods for the determination of the sound insulation performance (insertion loss) of machine enclosures.

This part of ISO 11546 specifies in situ methods for the determination of the sound insulation performance (insertion loss) of machine enclosures.

It applies to a total enclosure only and not to the individual panels from which the enclosure is made.

NOTES

1. Sound insulation for enclosure panels such as wall elements, doors, windows, silencers, etc. should be measured in accordance with other relevant standards.

2. Related standards concern noise-attenuation measurements of enclosures under laboratory conditions (ISO 11546-1) and cabins (ISO 11957).

The measurement methods specified in this part of ISO 11546 are based on International Standards in the series ISO 3740, ISO 9614 and ISO 11200 (see table 1). Depending on the method chosen, the sound insulation performance (insertion loss) of the enclosure is determined in terms of the reduction of sound power level or sound pressure level. Methods are given for measurements where the enclosure surrounds the actual sound source (machine). When these methods are not practicable, alternative measurements can be performed with an artificial sound source. Such methods are also described in this part of ISO 11546.