B&K 2250 Light Manual do Utilizador descarregar pdf (Página 307)

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Appendix E

Glossary

A-weighting filter: Frequency weighting corresponding approximately to the 40 dB equal

loudness curve, that is to say, the human ear’s response at low to medium

sound levels. It is by far the most commonly applied frequency weighting

and is used for all levels of sound.

WCrest

: Crest factor given by Peak

over the entire measurement period

: Time-averaged (RMS) weighted acceleration value, averaged over the entire

measurement period with frequency weighting W

or W

W,1s

Maximum time-weighted acceleration value during the latest second with

frequency weighting W

or W

and 1 s exponential time constant

B-weighting filter: Frequency weighting corresponding approximately to the 70 dB equal

loudness curve, that is to say, the human ear’s response at medium sound

levels.

C-weighting filter: Frequency weighting corresponding to the 100 dB equal loudness curve, that

is to say, the human ear’s response at fairly high sound levels. Mainly used

when assessing peak values of high sound pressure levels.

Criterion Level: Criterion Level is the maximum averaged sound level allowed for an 8-hour

period. Used for calculation of Dose, ProjDose, DoseUQ and ProjDoseUQ,

where U = F or S and Q = 4, 5 or 6 dB.

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B&K 2250 Light Manual do Utilizador Página 307