... the presence of sound. It isexpressed in pascals3.2sound pressure level, Lpten times the logarithm to the base 10 of the ratio of the square of the sound pressure to thesquare of the reference ... provisions of this part of IEC 60076. For dated references, subsequentamendments to, or revisions of, any of these publications do not apply. However, parties toagreements based on this part of IEC ... measurement of sound intensity –Measurement with pairs of pressure sensing microphonesIEC 61378 (all parts), Convertor transformersISO 3746:1995, Acoustics – Determination of sound power levels of...