SV 971A User Manual – Appendixes
Statistical level is the certain boundary
level surpassed by the temporary noise
level values in not more than n% of the
observation period
Expected value. Calculated on the basis of
100ms Leq results.
Standard deviation. Calculated on the
basis of 100ms Leq results.
Rolling Leq measured in the time window
for the last Tw seconds of the
measurement. LR window is moving with 1
second step.
Note: If the current measurement time T is less than the time window Tw the LR result is
undefined.
D.3 DEFINITIONS AND FORMULAS OF THE ADDITIONAL DOSIMETER FUNCTION RESULTS
Quantity of noise received by the worker,
expressed as the percentage of the whole
day acceptable value.
( )
−
=
T
0
q
LtL
h8
dt10
T
%100
DOSE
cd
Quantity of noise received by the worker
during 8 hours.
( )
DOSE
T
T
dt10
T
%100
h8_D
h8
T
0
q
LtL
cd
==
−
Quantity of noise received by the worker
during exposure time.
( )
DOSE
T
T
dt10
T
%100
DOSEPr
e
T
0
q
LtL
cd
==
−
Average level of the acoustic pressure for
the given time period
of the measurement.
( )
=
T
0
q
tL
dt10
T
1
logqLAV
d
SEL result corresponding to the integration
time equal to 8 hours. The SEL8 result is
calculated on the base of the LEQ.
s1
sT
log10LEQ8SEL
h8
+=
Individual Sound Exposure Level to the
noise is equal to the standing sound level
in a measurement period. The PSEL result
is calculated on the base of the LEQ.
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