Fft - UNI-T UTD2000CEX-II Series User Manual

5.2 FFT

Using FFT (Fast Fourier Transform) mathematical operations, the time
domain signal (YT) can be converted into frequency domain signal. The
following types of signals can be easily observed with using FFT:
Harmonic content and distortion in measurement system
Performance of noise in DC power supply
Vibration Analysis
FFT frequency spectrum
Press MATH button, then press F1 to select FFT to enter the FFT menu.
FFT menu
Options Descriptions
Functions
Type
FFT
Set any one of the CH1,CH2 for FFT source
Source CH1, CH2
Hamming Use Hamming Window Function
Blackman Use Blackman Window Function
Window
Rectangle Use Rectangle Window Function
Hanning Use Hanning Window Function
Vrms dBVrms , Set vertical unit as linear or dB (log)
Vertical Unit
FFT Tips
Signals with DC components might cause mistakes or inaccuracies in FFT
calculation. In order to reduce error, it is adviced to set the channel to AC.
In order to reduce interference or noise from isolated events, the capture
mode can be set to average.
UTD2000CEX-II
User Manual