Testing.

Laboratory measurement.



BS EN ISO 10140-2:2010 ‘Acoustics. Laboratory measurement of sound insulation of building elements. Measurement of airborne sound insulation’, formerly BS EN ISO 140-3: 1995, is the internationally accepted method for testing and is referred to in the Part E Approved Document. 

A full-scale sample (doorset or door assembly) is installed within a separating wall of known sound reduction within a split chamber. Sound is generated within one side of the chamber at frequencies varying from 50 Hz to 10,000 Hz.

A receiving unit in the other side of the chamber measures sound reduction resulting from both wall and sample in 3rd octave bands. The level of reduction for the doorset/assembly alone is then calculated.
Measurements from the test are evaluated in accordance with BS EN ISO 717/1, formerly BS 5821 :Part 1. A series of standard reference curves is applied to the range 100 Hz – 3150 Hz until unfavorable deviation is as large as possible, but not exceeding 32 dB (This covers the human speech range - other specific noise problems, such as a generator hum, may need specific testing at the appropriate frequencies, falling outside the standard). The figure at 500 Hz is taken to provide a usable interpretation of the results in the form of a ‘weighted sound reduction index’, the Rw figure expressed in RwdB. This is a single figure value that identifies the acoustic performance of the doorset/assembly.

It should be remembered that performance values quoted for products and ranges are based on laboratory test results: on-site testing will generally produce lower results.

Please contact the Technical Sales Department for further advice. 

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