NTi Audio XL2 Sound Level Meter - Manual (Page 83)

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Reverberation Time RT60
Start the Measurement
Press start • . The status indication switches to ARMED.
Enable the test signal; e.g., switch on the gated pink noise •
signal or fire a starter pistol.
The black bars have to exceed the grey bars completely.
•
The RT60 calculation cycle is complete when •
the sound pressure level falls below the bot-
tom of the grey level markers in every band.
Confirmation marks
• , indicating success-
ful measurements, are displayed above each
band.
Continue the Measurement
Using pink noise:
The gated pink noise test signal continues with the preset on/
off time. The XL2 automatically triggers at each cycle. Com-
plete a minimum of three test cycles to accurately calculate
the uncertainty factor.
Using an impulse source:
Use further starter pistol shots to repeat the measurements.
Press pause • to pause the measurement.
Prepare the next impulse sound source; e.g., starter pistol. •
Press start • to continue the reverberation time measure-
ment.
Enable the test signal; e.g., fire the starter pistol.
•
An automated algorithm calculates the averaged reverb time of
all measurement cycles.