B&K 2250 Light Manual do Utilizador descarregar pdf (Página 313)

APPENDIX E

Glossary

301

Loudness, Loudness

Level:

Loudness is the subjective judgement of intensity of a sound by humans.

Loudness depends upon the sound pressure and frequency of the stimulus

and whether the sound field is diffuse- or free-field. The unit is the Sone.

Loudness Level = 10*log2(Loudness) + 40. The unit is the Phone.

The Zwicker method of calculation of stationary loudness based on 1/3-octave

measurements is described in ISO 532 -1975, Method B.

Linear Weighting: ‘Linear’ frequency weighting is without any frequency weighting, that is,

equivalent to LIN, Z or FLAT.

Linear: Time-averaged (RMS) weighted acceleration (or voltage) value, averaged

over the entire measurement period with frequency weighting Linear

Geq

: The G-weighted equivalent continuous noise level – used to assess

infrasound

Gpeak

: Maximum peak sound level with G-weighting

G10

: Instantaneous time-weighted sound level with G-weighting and 10 s

exponential time constant

G10max

: Maximum time-weighted sound level measured with G-weighting and 10 s

exponential time constant

G10min

: Minimum time-weighted sound level measured with G-weighting and 10 s

exponential time constant

: a

expressed in dB with reference 10

–6

m/s

MTVV Maximum of the a

W,1s

values

#CPeaks(>140dB): The number of 1 s peak sound levels over 140 dB. ‘C’ denotes that the C

frequency weighting is used.

Three peak counters are available – one with a user-definable value (set to

140 dB by default), one with 137 dB and one with 135 dB value. Used for

assessing possible damage to human hearing caused by very high, short-

duration, noise levels.

The European Noise at Work Directive 2003/10/EC defines the following limit

and action values:

Limit Value: 140 dB corresponding to 200 Pa

Upper Action Value: 137 dB corresponding to 140 Pa

Lower Action Value: 135 dB corresponding to 112 Pa.

1 2 ... 308 309 310 311 312 313 314 315 316 317 318 ... 331 332

Comentários a estes Manuais

Sem comentários

B&K 2250 Light Manual do Utilizador Página 313

Comentários a estes Manuais

Manuais e produtos relacionados com Medição, teste e controlo B&K 2250 Light