SC310
User’s Manual
75
6.2.3 Sound pressure peak level
L
peak
(Peak)
The highest absolute instantaneous sound pressure value since the beginning
of the measurement, in decibels.
6.2.4 Equivalent continuous sound pressure level
L
T
and L
t
Equivalent continuous sound pressure level. This is the linear average of the
instantaneous sound pressure square from the beginning t
1
to the end t
2
. The
duration of the measurement is therefore T= t
2
- t
1
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
⋅
=
∫
2
1
t
t
2
0
2
eqT
dt
p
(t)
p
T
1
log
10
L
p(t):
instantaneous sound pressure
p
0
:
reference sound pressure (20
µ
Pa)
T:
duration of the measurement
The equivalent sound pressure level is the pressure level that, kept constant
throughout the entire measurement interval, has the same sound energy as the
measured sound event.
The equivalent continuous sound pressure level function is ideal for measuring
variable sound events such as road traffic or sound events that due to their long
duration cover a wide range of sound pressure levels, such as environmental
measurements.
Percentile levels are the perfect complement to the equivalent continuous
sound pressure level function.
The
SC310
measures the equivalent continuous sound pressure levels
L
t
and
L
T
.
The
L
t
equivalent level is the equivalent level of the interval measured, that is,
for each instant it gives us the value of the equivalent level from the beginning
of the measurement to that instant. When measurement has been completed,
the
L
t
value corresponds to the equivalent level of the entire measurement from
beginning to end.
The
L
T
equivalent level is the equivalent level corresponding to integration time
T (a programmable parameter). It is displayed every T time period. In other
words, every T time period the
SC310
shows the equivalent level of the last T
time period.
6.2.5 Sound exposure level (SEL)
L
E
(SEL)
Sound exposure level. This is the sound level that, kept constant for 1 second,
presents energy equivalent to the energy accumulated throughout the entire
measurement, in decibels.
