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SC-30
User’s Manual
53
7.3 Using the SC-30
7.3.1 Starting the SC-30
To start the SC-30, press the key:
The logo, together with the SC-30 sound level meter model will appear on the
screen. A few seconds later, the initial screen predetermined in the menu configuration
option will appear.
If the SC-30 does not switch on, check that a fully charged battery is fitted or that it is
connected to a suitable power supply.
7.3.2 Access to the Reverberation Time Mode
Switch on the SC-30 and check there is no measurement in progress ( ), sequencially press
the key until appears “REVERBERATION TIME 1/1”. Then will appear in the screen the
Reverberation Time mode screen. This mode will be distinguished because the
indication that will appear at the upper right corner of the screen
7.3.3 Measuring the Reverberation Time
The reverberation time mode of the SC-30 measures simultaneously the reverberation time
(T
20
and T
30
) for all the octave bands (from 63 Hz to 4 kHz ) through the interrupted noise
method.
This method lies in obtaining the sound pressure level decay according to time inside the
room that it is being studied. This decay is obtained exciting the room with random noise of
broadband or of limited bandwidth and recording the decay level of the sound pressure when
making a sudden interruption of the noise emission.
To do this measurement, you will need an omni directional sound pressure source (FPA-120)
to emit a broadband noise (pink noise)
From among the applications of this mode you should point up the measurement of the
reverberation time in rooms, the measurement of the absorption coefficient in reverberant
rooms, the measurement of the acoustic insulation in buildings and of building elements.
7.3.4 Beginning a measurement
First of all, check that is no measurement in progress ( ) . If there is, ( o ), press
to stop it.
Next, switch the SC-30 to reverberation time mode and follow the next steps: