Casella CEL-352 dBadge Instrukcja Obsługi Pobierz pdf (Strona 33)

Casella CEL-35X dBadge Users Handbook – Page 33

Decibel (dB)

The standard physical unit for measuring sound level and noise

exposure.

Estimated Exposure in Pa

A calculated estimate of the exposure that would be received by

the wearer if the average level measured continues for the period

defined by the criterion time. Expressed in Pascal squared hours

(Pa

h).

Fast Time Weighting

A standard time weighting applied by the sound level

measurement instrument.

IEC 61252

The International Standard for Personal Sound Exposure Meters.

LAE

The A-weighted exposure level is the level that would contain the

same amount of energy in one second as the actual noise has

during the whole measurement period.

LAeq

The A-weighted equivalent level is the level that would contain the

same amount of noise energy as in the actual noise, effectively

giving an average level over the measurement period. Following

the ISO procedures, doubling the energy results in a 3dB change

in the Leq. This is denoted by exchange rate Q=3. For example, if

the noise level in a factory was a constant 85dB and the

measurement period was 4 hours, the LAeq would be 85dB(A).

The calculation of LAeq DOES NOT USE a Threshold as in the

calculation of LAVG.

LAF

The A-weighted sound level measured with Fast time weighting.

LAS

The A-weighted sound level measured with Slow time weighting.

LASmax

The maximum A-weighted sound level measured with Slow time

weighting.

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Casella CEL-352 dBadge Instrukcja Obsługi Strona 33