Svantek SV 971A, User Manual

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SV 971A User Manual
– Appendixes
288
Ln Statistical level is the certain boundary
level surpassed by the temporary noise
level values in not more than
n% of the
observation period
see Chapter D.4
EX
Expected value. Calculated on the basis of
100ms Leq results.
SD Standard deviation. Calculated on the
basis of 100ms Leq results.
LR Rolling Leq measured in the time window
for
the last Tw seconds of the
measurement. LR window is moving with 1
second step.
𝐋𝐑(𝐓𝐰)
= 𝟏𝟎 𝐥𝐨𝐠 (
𝟏
𝐓𝐰
∫ ( 𝐫(𝐭) 𝐩
𝟎
⁄ )
𝟐
𝐝𝐭
𝐓
𝐓−𝐓𝐰
)
Note: If the current measurement time T is less than the time window Tw the LR result is
undefined.
D.3 D
EFINITIONS AND FORMULAS OF THE ADDITIONAL
D
OSIMETER FUNCTION RESULTS
DOSE 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 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
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 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 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
 + =