Specifications

We are now ready for the second FFT acquisition. You may disconnect the power
amplifier because now we will rely on an external stimulus by means of an inflated
balloon.
We are going to analyze the explosion of the balloon, which will give us a measure
of the impulse response of our room. Open the FFT Option dialog and uncheck the
RTA box, set the Event Trigger to Enable and One Shot, and input -5ms into the
Delay edit box.
Close the dialog. Now set Input sensitivity to +20dBV to avoid overload, because
the balloon explosion, even for small balloons, provokes high peak pressures.
Press the Frequency&Time Graphs button; go into the lower time graph and
press the Zoom Out button until the right time scale reaches 1000ms. In this
way we will see most of FFT acquisition (which is 1.37s @ 64k samples @ 48kHz).
Start FFT acquisition; the FFT is set in Event Trigger mode therefore, with only a
small signal at microphone,the display should be frozen, with CLIO waiting for an
event able to trigger acquisition. The FFT running display and a blinking cursor
indicates this.
4 ENJOY CLIO POCKET 51