Casella CEL-352 dBadge Manuale delle Istruzioni Scaricare il pdf (Pagina 35)

Casella CEL-35X dBadge Users Handbook – Page 35

Peak

The maximum level in dB reached by the sound pressure at any

instant during a measurement period. With the dBadge, Peak is

measured with either C, Z or A weighting. It is the true peak level

of the pressure wave, which should not be confused with the

highest sound pressure level, termed Lmax.

Slow Time Weighting

A standard time weighting applied by the noise measurement

instrument.

SPL

The sound pressure level. This is the basic physical measure of

noise, and is normally expressed in dB.

Threshold

A threshold below which sound levels are excluded from

calculation. OSHA measurements use an 80 dB threshold and call

for a hearing conservation program to be implemented when the

eight hour TWA exceeds 85 dB (50% dose).

TWA

This is a parameter used in OSHA measurements. The time

weighted average is the daily personal exposure level calculated

from the LAVG and measurement duration.

Z-Weighting

Effectively this is a linear, or un-weighted measurement. In the

dBadge system it is used for the measurement of peak sound

pressure level against the OSHA standard.

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Casella CEL-352 dBadge Manuale delle Istruzioni Pagina 35