User manual

77
Reverberation Time RT60
4
Measurement Status STAT
Displays the actual measurement status. Start and stop the
reverberation time measurement with start/stop
. The
following status information is displayed:
ARMED Measurement is waiting for the test signal
to exceed at least one measurement trigger
marker, then the measurement is triggered
automatically.
NOISE A sound stimulus signal above the trigger
marker is being received.
DECAY Decay is being measured.
PAUSE The measurement has been paused by press-
ing pause
.
STOP No RT60 measurement is presently being per-
formed.
5
Average AVRG
Counts the measurement cycles. When using an interrupt-
ed noise test signal, a minimum of 3 sequential cycles is
recommended.
6
Actual Real-Time Spectrum
The black bars indicate the actual signal, including back-
ground noise. While setting up the reverberation time mea-
surement you should increase the test signal level until the
black bars exceed the grey bars completely and the status
4
displays NOISE.
7
Level Marker
The grey bars indicate the signal level required for effective
reverberation time measurements in each octave band.
The marker has a length of 35 dB, and can be set by
Selecting • SET
1
with the rotary wheel
.
Press enter •
to measure the environmental noise in
the silent room.
8
Band Status
Indicates a successful reverberation time measurement
above each octave band with a tick
.
9
Measurement Method
Select between the measurement methods T20 and T30.
T20 requires just a small dynamic measurement range of
~35 dB above the ambient noise level for each frequen-
cy band. T30 requires a dynamic measurement range of
~45 dB.