BS EN ISO 717-1:2020 pdf free.Acoustics – – Rating of sound insulation in buildings and of building elements.
BS EN ISO 717-1 This document a) defines single-number quantities for airborne sound insulation in buildings and of building elements such as walls, floors, doors, and windows,b] takes into consideration the different sound level spectra of various noise sources such as noise sources inside a building and traffic outside a building, and c gives rules for determining these quantities from the results of measurements carried out in one-third-octave or octave bands for example in accordance with ISO 10140-2 and ISO 16283-1.The single-number quantities in accordance with this document are intended for rating airborne sound insulation and for simplifying the formulation of acoustical requirements in building codes. An additional single-number evaluation in steps of 0,1 dB is indicated for the expression of uncertainty (except for spectrum adaptation terms). The required numerical values of the single-number quantities are specified according to varying needs. The single-number quantities are based on results of measurements in one-third-octave bands or octave bands.For laboratory measurements made in accordance with ISO 10140-2, single-number quantities are calculated using one-third-octave bands only.The rating of results of measurements carried out over an enlarged frequency range is dealt with in Annex B.To evaluate the results of a sound insulation measurement in one-third-octave bands (or octave bands), the measurement data shall be given to one decimal place1). Shift the relevant reference curve in increments of 1 dB (0,1 dB for the expression of uncertainty) towards the measured curve until the sum of unfavourable deviations is as large as possible, but not more than 32,0 dB (measurement in 16 one-third-octave bands) or 10,0 dB (measurement in 5 octave bands).For field measurements in accordance with ISO 16283-1 or ISO 16283-3, it shall be stated whether the single-number quantity is calculated from measuring results in one-third-octave bands or octave
bands. In general, there can be differences between single-number quantities calculated from one-third-octave or octave band measurements of about +1 dB.BS EN ISO 717-1 pdf download.