12.4 START RT60 MEASUREMENTS
Measurements with the use of Decay method
1. Set parameters for Decay RT60 measurements. Most used setup is
presented below.
• Method: Decay
• Recording Time: 7 s
• Time Step: 10 ms
• Smoothing: 3
• Noise Mar.: 10.0 dB
• Level: 100 dB.
2. Place the sound power source in the measured room (for the sound power
source location - see the reverberation time measurement ISO standard).
3. Place the microphone in one of the selected measurement points (for the
measurement points location see the reverberation time measurement ISO
standard).
Note: The default measurement time of the decay curve registering (Recording Time) is 7 seconds.
It can be insufficient in some applications. It is recommended to set this value to be at least two times
longer than expected reverberation time. For details see Appendix E.
4. Switch on the sound power source.
5. Start the measurement process by
pressing the <Start/Stop> key. While
the instrument is waiting for the trigger
condition fulfilment the Spl result is
displayed.
6. Switch off the sound power source (the
source should work enough long to
obtain the acoustic field stabilisation).
After the trigger condition fulfilment,
the instrument starts to collect data.
7. After the data recording process ends,
the instrument starts the calculation of
the reverberation time results. During
this process, the messages
“Reading Logger…” and
„Calculations…” appear.
8. To save results press the <Save> key
or use the File menu option.
Note: It is necessary to switch on the sound source before starting the measurement because of the
trigger requirements (for more details see Appendix E). If it is necessary to start the instrument before
switching on the sound source it is recommended to use the higher Start Delay value.
Measurements with the use of Impulse method
1. Set parameters for Impulse RT60 measurements. Most used setup is
presented below.
• Method: Impulse
• Recording Time: 7 s
• Time Step: 10 ms
• Smoothing: 3
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