Measurement of sound power levels

Paul Boughton
Machinery manufacturers required by law to provide precise specifications of product noise levels can reduce the time and effort involved by using Bruel & Kjaer's new handheld sound intensity system, the 2270-G.
A combination of strict legislation and customers demanding noise-friendly surroundings has increased pressure for manufacturers producing products - such as washing machines, refrigerators, lawn mowers and electric motor devices - to label the noise output in accordance to national and international standards.
Many machines also contain parts from sub-suppliers, which means that in order for manufactures to predict noise output they must label individual parts to ensure the final product is in accordance with national and international standards.
To simplify this process, Bruel & Kjaer has created its 2270-G, a complete sound intensity system comprising a handheld sound level analyser (2270), Sound Intensity Software (BZ-7233) and a Sound Intensity Probe Kit. This portable, battery-operated system enables one person to make sound intensity measurements complying with the IEC 61043 sound intensity standard.
Users simply swap the 2270 meter's microphone for the sound intensity probe to start measuring. The BZ-7233 software transforms the analyser into a powerful measurement tool, using the intensity technique to determine sound power levels and locate noise sources using contour maps. An innovative phase calibration technique enables users to make all measurements with a 12mm spacer covering a frequency range from 50Hz to 10kHz.
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