Dayton Audio OmniMic V2 Precision Measurement System - Manual (Page 40)

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 Set the value of the "Integration time" to a value approximately equal to the expected RT60 of
the room (around 500 milliseconds typically). The optimum value is the one that makes the
decay line the straightest and longest.
 Set the lower and upper frequency limits to define each frequency range over which you wish
to measure. The width of the range will be displayed in Hz and in Octaves. If you wish to
force the controls to hold current number or octaves of range, click the small "lock" icon and
the controls will track accordingly. Click again to unlock.
 Click on the graph to define a line parallel to the decay curve. The slope of this curve defines
the value of RT60, which will be displayed on the screen until the next graph update. This may
be easier to do if you first freeze the graph with the Pause button at top left of the OmniMic
screen.
ETC (Energy-Time Curve)
The curve shown is the energy relative to the level of the energy in the first peak as an impulse