Hioki MEMORY HiCORDER 8855, Инструкция по эксплуатации

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4.1 Overview of the FFT Function
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Chapter 4
FFT Function
4.1 Overview of the FFT Function
The FFT function has the following features.
(1) FFT (Fast Fourier Transform) processing can be performed on input signal
data for frequency analysis.
(2) Frequency range
133 mHz to 8 MHz
(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 anti-aliasing filter
Automatic selection of cutoff frequency to match frequency range (8953-10
HIGH RESOLUTION UNIT)
We recommend using an input module equipped with an anti-aliasing filter
that can be enabled to minimize sampling distortions during FFT analysis.
Refer to Appendix 3.9, "FFT Function" for more information about aliasing
distortion and anti-aliasing filters.