NTi Audio Acoustilyzer AL1 - Manual (Page 39)

• Start the pink noise test signal with the
appropriate on/off time according the
room under test.
Note: Use an initial low sound pressure
level (to protect your ears against
excessive sound level and hearing
damage).
• Increase the test signal level until all
individual octave band marks for the
minimum test signal level have been
passed. If required, an equalizer can be
used to push up individual band levels.
Start RT60 measurement
• Select the START icon and press the
enter key to initiate the reverberation
time measurement.
• The status indication switches to
ARMED.
• Complete several test cycles so an
averaged test result can be calculated.
• The individual octave band sound
pressure level increases above the
upper marks.
• Switch off the test signal.
• Once the sound pressure level has fallen
below the lower marks in each individual
octave band the RT60 is calculated.
Confirmation marks are displayed for
successful octave band reverberation time
measurements.
39