Ivie IE-45 RT60 - Reverberation Time Analysis - Manual (Page 3)

Optional Software Function Module RT60
The resultant decay curve is automatically displayed. The user may then view the
calculated ISO 20 and ISO 30 RT60 data. The program allows the user to position
two cursors on the curve and determine the RT60.
STEP 1 - Select the RT60 function by pressing the "Function" menu and then selecting
"RT60." This will take you to the RT60 "Setup" screen. Please note that the "RT60"
menu item will only be accessable if the Optional Software Function Module has
been purchased and activated on your unit.
STEP 2 - Open the "Options" menu and select the time duration for the RT60
measurement. If you expect the measured RT60 to be greater than 0.75 seconds but
less than 3.0 seconds, select "T = 3 seconds" for the measurement duration.
STEP 3 - Open the "Options" menu again and select "Pink Noise Mode." Select "Pink
Noise" if you plan to utilize a sound system within the room.
STEP 4 - Select RT60 measurement in 1/3 Octave or 1/1 Octave.
STEP 5 - View the ambient noise in the room and adjust the dB range control so the
noise appears at the bottom of the screen.
STEP 6 - Turn on the Pink Noise and adjust its level so that it is at least 30 dB above the
ambient noise in the room.
STEP 7 - Press the "Test RT60" button to turn off the Pink noise and go to the Test
Screen.
RT60 Test Setup for Pink Noise Mode
TEST SCREEN
The Pink Noise Mode is used when the room under test has an existing sound system or the user
will be using a portable sound system. Pink noise generated by the RT60 program is output via the
PDA earphone jack to the input of the sound system. The Pink noise is switched on by the user and
levels are adjusted so that the Pink noise level is 30 to 40 dB above the ambient noise in the room.
The RT60 measurement is performed when the user initates the test. The the Pink noise is turned off
and the measurement of sound decaying in the room is instituted.
STEP 8 - Press the to turn on the
Pink Noise in preparation for the test.
STEP 9 - Press the button to start
the test. The Pink Noise will be gated Off and the
button will change to for the duration
of the test.
STEP 10 - The RT60
Test Data Screen will
automatically appear.