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BS EN ISO 140-4
BS EN ISO 140-4:1998 (Replace by 16283-1:2014)
Specifies field methods for measuring the airborne sound insulation properties of interior walls, floors and doors between two rooms under diffuse sound field conditions.
The methods give values for airborne sound insulation which are frequency dependent. They can be converted into a single number, characterizing the acoustic performance, by application of ISO 717-1.
The results obtained can be used to compare sound insulation between rooms and to compare actual sound insulation with specified requirements.
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BS EN ISO 354
Reverberation Time Measurement – BS EN ISO 354
In a room with highly reflecting surfaces, such as a bathroom, the reverberation time is relatively long, while in an anechoic chamber where all the walls, the ceiling and the floor are covered by a highly absorbent material, the reverberation time is nearly zero. The absorption of different materials varies widely with the frequency of the incident sound and the angle of incidence. It follows that the reverberation time is liable to vary with frequency. Generally, the reverberation time is longer at lower frequencies because these are usually less effectively absorbed than higher frequency.
It is important that the reverberation time suits the intended use of the room. Too long a reverberation time renders speech less intelligible and music more cacophonous and produces higher background noise levels. A short reverberation time deadens background noise, but muffles speech and makes music sound thin and staccato.
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BS EN ISO 717
Test Report – Determination of Single Rating Number BS EN ISO 717
Defines single-number quantities for airborne sound insulation in buildings and of building elements such as walls, floors, doors and windows.
Takes into consideration the different sound level spectra of various noise sources such as noise sources inside a building and traffic outside a building.
Give rules for determining these quantities from the results of measurements carried out in one-third octave or octave bands in accordance with ISO 140-3, ISO 140-4, ISO 140-5, ISO 140-9 and ISO 140-10.
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Acoustic Instruments
Our partner in sound measurement – NTI Audio XL2 from Switzerland.
- Sound Level Meter
- Real Time Analyzer
- Audio Analyzer
- FFT Spectrum Analyzer
- STIPA Analyzer
The XL2 is the reference instrument in audio and acoustic measurement, and provides reliable measurement solutions for sound system installations, noise control, architectural acoustics, evacuation systems, live events and quality inspection and generates test reports for documentation.
This instrument confirms compliance with system specifications and regulations such as IEC 60849, EN 54-24. Measure speech intelligibility STIPA in accordance with the IEC 60268-16 standard.
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Industry Standards
BS EN ISO 140-4:1998 (16283 1:2014) Airborne Sound Insulation Testing
BS EN ISO 354 Reverberation Time Measurement
BS EN ISO 717 Part 1 & Part 2 Determination of Single Rating Number
BS EN 140 Part 7 Impact Sound Insulation Testing
Approved Document E (E1 E4), Building Regulations-UK E1 Protection against sound from other parts of the building and adjoining
building.
E2 Protection against sound within a dwelling-house etc.
E3 Reverberation in the common internal parts of buildings containing flats
or rooms for residential purposes
E4 Acoustic conditions in schools
HTM 08-01 Acoustic design criteria for healthcare premises
Institute of Acoustics, UK (IOA)
US Green Building Council (USGBC)
Leadership in Energy & Environmental Design (LEED)
Project Management Institute (PMI)