CASELLA CEL CEL-490 Manuel d'utilisateur télécharger pdf (Page 67)

CEL-63x Environmental Noise Meter

67 Casella CEL

8 Glossary

The following list defines some of the acoustic terms that you can find in this

User Manual. For additional information, contact Casella CEL or your local

agent.

Acoustic calibrator

An instrument that provides a reference noise source with

a standard level and frequency. It is used to calibrate and

the check the performance of sound level meters and

noise dosimeters.

decibel (dB)

The standard unit for measuring sound level and noise

exposure.

dB(A)

A-weighted sound level in decibels.

A-weighted measurements are shown by using the

subscript „A‟.

A standard weighting of audible frequencies designed to

imitate the response of the human ear to noise.

dB(C)

C-weighted sound level in decibels.

C-weighted measurements are shown by using the

subscript „C‟.

C-weighting is a weighting used in the Control of Noise at

Work Regulations, and applies only a relatively small

correction to very loud noise sources.

dB(Z)

Z-weighted sound level in decibels.

Z-weighting applies no weighting to the frequency of

measurement. It is a raw measurement of sound level

across the complete frequency range of the instrument.

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CASELLA CEL CEL-490 Manuel d'utilisateur Page 67