Svantek SVAN 971, Руководство пользователя

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SVAN 971 User Manual
– Appendixes
217
Lnn 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.
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
  
E The E result (Exposition) represents the
amount of the acoustical energy received by
the worker.
 
10
LEQ
2
o
10 p
3600
s T
E
 
E_8h The E_8h result (Exposition in 8 hours)
represents the amount of the acoustical
energy
received
by the worker during 8 hours. The E_8h result
is expressed in the linear units [Pa
2
h].
 
10
LEQ
2
o
10 p h 8 h 8 _ E
  