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If a pure sine wave was playing at a certain frequency, then the micro
-
phone would measure this, and the FFT display would show a peak
at the fundamental frequency. If however, this pure sinewave was
overloading the power amplifiers and causing distortion, then the FFT
graph would display the fundamental frequency peak, as well as other
(naughtier) peaks at higher harmonic frequencies.
Note: If the Fast Fourier Transform seems to be running slowly, ask the
band to pep it up a bit.
Menu items along the bottom allow you to (from left to right):
• Change the graph-smoothing in fractions of an octave
• Pause/start the measurement
• Save and recall measurements
• Setup the internal signal generator to play audio through your
sound system
• Setup the display, such as SPL range, frequency range
• Choose the measurement decay rate
Experiment with any of the FFT controls until you are also at one with
them. If this was Scouts, you would then proudly earn your FFT badge.
