Tool identifies elusive tones
A
Bruel and Kjaer product story
Edited by the Engineeringtalk editorial team
Jan 24, 2008
Bruel and Kjaer's new tone assessment tool provides on-the-spot calculations for tone-corrected rating levels and the results are displayed in accordance with ISO 1996-2 Annex C.
Local authorities and acoustic consultants can reduce time and money spent investigating the existence of elusive tonal noises Bruel and Kjaer's new tone assessment tool.
Tonal noise typically contains a continuous note which can include hums, hisses, screeches or droning sounds.
These noises are conclusively identify to prove and can quite often be disputed.
Created for use with Bruel and Kjaer's 2250 sound level meter, this tone assessment application provides simultaneous measurements of the LAeq - as well as other broadband parameters.
It provides on-the-spot calculations for tone-corrected rating levels and the results are displayed in accordance with ISO 1996-2 Annex C.
By using ISO 1996-2, which provides an objective method for verifying the presence of tones, Bruel and Kjaer's tone assessment produces instant, objective feedback, allowing users to determine whether they have identified the problem or need to make further measurements.
Bruel and Kjaer's instruments are also equipped with a tone generator so that an audible tone can be compared with the measured sound.
The tonal assessment application is available as an add-on with Bruel and Kjaer's FFT Analysis software for the Type 2250 sound level meter.
The 2250 meter is extremely user-friendly with a large dynamic range and frequency resolution, allowing the operator to simply position the analyser in an appropriate location and start measuring.
As objective measurement results can be very comprehensive in detail, it's helpful to have a sound recording of the noise for the benefit of a nontechnical audience.
For this purpose, Bruel and Kjaer's tonal assessment tool is also compatible with its 2250 meter's sound recording tool.
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