Villar, 20 - 08041 Barcelona (Spain) - Tel. (34) 934.335.240 - Fax. (34) 933.479.310 - e-mail: info@cesva.com - www.cesva.com
SC160
Reverberation time module
30
40
50
60
70
80
90
100
110
The module of reverberation time measurement of the
SC160
Sound Level Meter allows:
•
The simultaneous measurement of T
20
and T
30
reverberation
times by the interrupted noise method for the octave bands of
63, 125, 250, 500, 1000, 2000, and 4000 Hz.
T
30
Is the time, expressed in seconds, that it is required for
the sound pressure level to decrease by 60 dB. The T
30
is the result of multiplying by 2 the time that it takes for
the level to decrease by 30dB.
T
20
Is the time, expressed in seconds, that it is required for
the sound pressure level to decrease by 60 dB. The T
20
is the result of multiplying by 3 the time that it takes for
the level to decrease by 20dB.
•
Measurement range (depends on the frequency band):
TR minimum:
0,2 s
TR maximum: 10,0 s
•
The automatic detection of the decay curve and its slope es-
timation through a least square approximation.
•
Decay curves calculated from the averaging time between
10 ms and 40 ms depending on the frequency band.
•
The possibility of storing the results in memory: Values of
T
20
, T
30
and decay curves, for all octave bands.
The reverberation time module for the
SC160
is optional and may
be purchased when buying the
SC160
or later. All
SC160
pur-
chased before this date may be upgraded with this module.
Below a graphic is shown with the steps that must be followed to
make a reverberation time measurement.
Storage Capacity
Reverberation time (T
20
and T
30
) + Background noise
(L
N
) + maximum level (L
N
+
∆
) + decay time history
100 measure-
ments
Reverberation time mode in 1/1 oc-
tave bands
Calculation and measurement stan-
dards
•
ISO 3382-1:2009 Measurements of
the reverberation time in perform-
ance spaces.
•
ISO 3382-2:2009 Measurements of
the reverberation time in ordinary
rooms.
•
ISO 354:1985: Measurement of the
coefficient absorption in a reverbera-
tion room.
•
ISO 140:1998: Measurement of
sound insulation in buildings and of
building elements.
Procedure for the RT measurement
1.
Switch the SC160 to RT mode
2.
Press
to start the measurement
process
3.
Validate the background noise by
pressing
4.
Progressively increase the sound pres-
sure level by starting the sound source
5.
When the source emits the necessary
sound pressure level and the acoustic
field reaches the stationary state, press
to validate this level
6.
Stop the noise emission
7.
A few seconds after the noise emission
stops the RT values will appear on the
screen of the SC160.
Maximum level (L
N
+ ∆)
Background
noise L
N
∆
8
