Svantek SV 973, Руководство пользователя

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SVAN 973 User Manual
– Appendixes
201
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)
max 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)
min 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
L(A/C/Z)(S/F/I) Time weighted sound level expressed at
observation time, expressed in dB, for
frequency weightings A, C, Z and time
weightings F, S, I symbols are LAF, LAS,
LCF, LCS etc.
( )






=

2
0
2
W
p
t p
log 10 L
L(A/C/Z)eq Time averaged equivalent continuous sound
level (
Leq ) expressed in dB, for frequency
weightings A, C, Z symbols are LAeq, LCeq
and LZeq. In principle time weighting is not
involved in a determination of time averaged
sound level. Time-averaged sound level is
calculated for current time period of the
measurement (
T ).
( )
( )








=

T
0
2
0
dt p t r
T
1
log 10 Leq
L(A/C/Z)E Sound Exposure Level ( SEL ) expressed in
dB, for frequency weightings A, C, Z,
symbols are LAE, LCE and LZE.
SEL is
essentially the subset of the Leq result. Its
value is equal to the Leq result referred to the
integration time equal to one second (so, for
the Integration time equal to 1 s,
SEL is
always equal to Leq ).
( )
( )
s 1
T
log 10 Leq dt p t r log 10 SEL
T
0
2
0
+ =








=

L(den) Only one result from: Lday , Leve , Lnight , Lde , Len , Lnd , and Lden is available in the
instrument. It depends on the day and night time in which the measurement was
performed. Day and night time depend on the
<Day Time Limits> option ( 6h-18h or 7h-
19h ).