B&K 2250 Light Manual do Utilizador descarregar pdf (Página 308)

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Hand-held Analyzer Types 2250 and 2270 – User Manual

Decibel (dB): The measurement unit for expressing the relative intensity of sound. A direct

application of linear scales (in Pa) to the measurement of sound pressure

leads to large and unwieldy numbers. As the ear responds logarithmically

rather than linearly to stimuli, it is more practical to express acoustic

parameters as a logarithmic ratio of the measured value to a reference value.

This logarithmic ratio is called a decibel or dB. The advantage of using dB

can be clearly seen in the below illustration. Here, the linear scale with its

large numbers is converted into a manageable scale from 0 dB at the

threshold of hearing (20 Pa) to 130 dB at the threshold of pain (100 Pa).

Our hearing covers a surprisingly wide range of sound pressures – a ratio of over a million to one. The

dB scale makes the numbers manageable

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