Svantek SV 971A, User Manual

Page: 286 / 305

SV 971A User Manual
– Appendixes
286
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 ).