Casella CEL-35X dBadge Users Handbook – Page 36
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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