User Manual

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8.1 Outline of the FFT Function

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NOTE

Chapter

FFT Functio

.1 Outline of the FFT Function

(1) FFT (Fast Fourier Transform) processing can be performed on input signal data

for frequency analysis.

(2) Frequency range

133 mHz to 400 kHz

(3) Frequency resolution

1/400, 1/800, 1/2000, 1/4000 of frequency range

(4) 12 types of analysis functions

Storage waveform, linear spectrum, RMS spectrum, power spectrum, auto-

correlation function, histogram, transfer function, cross-power spectrum, cross-

correlation function, unit-impulse response, coherence function, octave analysis

(5) Analysis modes

1-channel FFT, 2-channel FFT

(6) Analysis of data stored with memory recorder function and recorder and memory

function possible

(7) Switchable antialiasing filter

Automatic selection of cutoff frequency to match frequency range (8938 FFT

ANALOG UNIT)

・We recommend using an input unit equipped with an anti-aliasing filter

that can be enabled to minimize sampling distortions during FFT analysis.

・Refer to Section 21.3.10 for more information about aliasing distortion and

anti-aliasing filters.