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120
SVAN 979 User Manual
12.4 S
TART
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
Summary of Contents for SVAN 979
Page 272: ...272 SVAN 979 User Manual Appendixes 400 Hz 500 Hz 630 Hz 800 Hz 1000 Hz 1250 Hz ...
Page 273: ...273 SVAN 979 User Manual Appendixes 1600 Hz 2000 Hz 2240 Hz 2500 Hz 2800 Hz 3150 Hz ...
Page 274: ...274 SVAN 979 User Manual Appendixes 3550 Hz 4000 Hz 4500 Hz 5000 Hz 5600 Hz 6300 Hz ...
Page 275: ...275 SVAN 979 User Manual Appendixes 7100 Hz 8000 Hz 8500 Hz 9000 Hz 9500 Hz 10000 Hz ...
Page 312: ...312 SVAN 979 User Manual Appendixes Summary curve ...
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Page 349: ...349 SVAN 979 User Manual Appendixes 1000 Hz 1250 Hz 1600 Hz 2000 Hz 2240 Hz 2500 Hz ...
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Page 352: ...352 SVAN 979 User Manual Appendixes 9500 Hz 10000 Hz 10600 Hz 11200 Hz 11800 Hz 12500 Hz ...
Page 370: ...370 SVAN 979 User Manual Appendixes O ring gasket locations inside ...