Fft Menu Description; Fft Operation Knack - UNI-T UTD2025C Operating Manual

Form 2-3: FFT menu Description
Setup
Function
Type FFT
CH1
Information
CH2
source
Hanning
Hamming
Blackman
Window
Rectangle
Vrms
Vertical unit
dBVrm
23
Description
FFT mathematical
calculation
To set CH1 and CH2 as
calculation waveform.
Set Hanning window
function
Set Hamming window
function
Set Blackman window
function
Set Rectangle window
function
To set vertical unit to
Vrms or dBVrms.
Operating Manual for UTD2000/3000

FFT operation knack:

Signals with DC component or deviation will bring
in error or deviation of FFT waveform component.
AC coupling mode can be selected to reduce DC
component.
Average obtainment mode of digital storage
oscillograph can be set to reduce random noise
and aliasing frequency component of repeated or
single pulse event.