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Decibels

This guide explains the three key weighting standards for measuring sound in decibels: A, B, and C. A-weighting attenuates lower frequencies, mimicking human ear sensitivity, particularly between 3000 and 4000 Hz. It establishes maximum allowable limits such as 110 dB for ½ hour and 105 dB for 1 hour. B-weighting provides readings for high and middle frequencies, while C-weighting offers a flat response across all frequencies, making it ideal for identifying issues when other measurements are excessively high.

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Decibels

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  1. db • Decibels

  2. "A" Weighting • Attenuates the lower frequencies to approximate the response of the human ear, which is most sensitive to frequencies between 3000 and 4000 Hz. • WCB Reference Standard • 110 db per ½ hour maximum allowable • 105 db 1 hour

  3. "B" Weighting • Gives decibel readings of combined high- and middle-frequency signals. Lower frequencies are rolled off. Use in conjunction with A weighting to isolate sounds that are causing a problem.

  4. "C" Weighting • Reads all frequencies the same but gives a better response to higher frequencies than A or B weighting. Use to pinpoint problems when A or B weighted scale readings are very high. • Full Audio Spectrum

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