Svantek SV 973, Руководство пользователя

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SVAN 973 User Manual
– Appendixes
203
Ln Statistical level is the certain boundary level
surpassed by the temporary noise level
values in not more than
n% of the observation
period
Example: Let us assume that L35 is
equal to 76.8 dB. It means that during
the measurements the noise level
76.8 dB was exceeded in not more
than 35% of the observation period.
EX Expected value. Calculated on the basis of
100ms Leq results.
SD
Standard deviation. Calculated on the basis
of 100ms Leq results.
D.3 D
EFINITIONS AND FORMULAS OF THE ADDITIONAL
D
OSIMETER FUNCTION RESULTS
DOSE
The DOSE result is the quantity of noise
received by the worker, expressed as the
percentage of the whole day acceptable
value.
( )

−
=
T
0
q
L t L
h 8
dt 10
T
% 100
DOSE
c d
D_8h
The D_8h result is the quantity of noise
received by the worker during 8 hours.
( )
DOSE
T
T
dt 10
T
% 100
h 8 _ D
h 8
T
0
q
L t L
c d
 = =

−
PrDOSE
The PrDOSE result is the quantity of noise
received by the worker during exposure time.
( )
DOSE
T
T
dt 10
T
% 100
DOSE Pr
e
T
0
q
L t L
c d
 = =

−
LAV
The LAV result is the average level of the
acoustic pressure for the given time period
of the measurement.
( )








 =

T
0
q
t L
dt 10
T
1
log q LAV
d
SEL8
The SEL8 result is the SEL result
corresponding to the integration time equal to
8 hours. The
SEL8 result is calculated on the
base of the LEQ .
 
 
s 1
s T
log 10 LEQ 8 SEL
h 8
 + =
PSEL
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 .
h 8
T
T
log 10 LEQ PSEL
 + =