Larson Davis 831 - Page 521

C-8 Basic Integrated Level Calculations Model 831 Manual
expressed in pascal-squared hours for measurements of
noise exposure in the workplace.
Note that the 831 displays Sound
Exposure Level as L
XE
, where X is
the frequency weighting (X=A, C or
Z).
Sound Exposure Level
The A-weighted sound exposure level L
AE
is related to a
corresponding measurement of time-average, A-weighted
sound level, L
AT
or L
AEeqT
, by
where
E
A
is the A-weighted sound exposure in pascal-squared
seconds
E
0
is the reference sound exposure of:
(20 Pa


xs = 400 x 10
-12
Pa
2
s
T0 = 1 s
T = t
2
- t
1
, the time interval for measurement, in seconds, for
sound exposure level and time-average sound level


 
dBTTLdBEEdBTpdttpL AT
A
t
t
A
AE
000
2
0
2
1
2
/// lg10lg10lg10 
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