Svantek SV 200A, Руководство пользователя

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195 SV 200A User Manual
D.2 D
EFINITIONS AND FORMULAS OF THE
SLM
RESULTS
The instrument calculates the sound measurement results for three profiles. The calculation flow diagram for
one profile is presented below:
OVL Percentage of the overloaded input signal, which occurred during the current time
period of the measurement (
T )
L(A/C/Z)peak Peak sound level expressed in dB, for
frequency weightings A, C, Z, symbols are
LApeak , LCpeak and LZpeak . Peak sound
level is calculated for the given T .
( )






=
2
0
2
W
p
t p
max log 10 Peak
T
L(A/C/Z)(S/F/I)m
ax The highest time weighted sound level ( Max )
expressed in dB, within a stated time interval,
for frequency weightings A, C, Z and time
weightings F, S, I symbols are LAFmax,
LASmax, LCFmax, LCSmax etc.
( )






=

2
0
2
W
p
t p
max log 10 Max
T
L(A/C/Z)(S/F/I)mi
n The lowest time weighted sound level ( Min )
expressed in dB, within a stated time interval,
for frequency weightings A, C, Z and time
weightings F, S, I symbols are LAFmin,
LASmin, LCFmin, LCSmin etc.
( )






=

2
0
2
W
p
t p
min log 10 Min
T
p
2
wτ
(t)
τ = Fast
τ = Slow
τ = Imp
p
w
(t)
p(t)
p
2
w
(t)
L
peak
L
max,
L
min, Spl,
L
tm3,
L
tm5
L
eq,
SEL,
L(den),
LEPd