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UTD1000L User Manual
FFT Spectrum Analysis
FFT Operation Tip
s
Select FFT Window
FFT (Fast Fourier Transform algorithm) mode ca
n
convert time domain (YT) into Frequency domai
n
for signal waveform graph, which helps to easil
y
observe signals of following kinds
:
Harmonic component and distortion in the
measurement system
Char acte ri ze noises i n DC s ourc e
A
nalyze the virbratio
n
Signals w ith DC components or bias may cause
error or deviation to FFT waveform components. I
n
order to reduce DC component, you can set
coupling to AC mode. And you can set ACQUIRE
type to AVG to lower down random noise or mixed
overlapped frequency component in repetitive or
single pulse event
.
S
uppose YT waveforms repeats constantly and the
Oscilloscope then performs FFT on limited lengt
h
record. When the period numers are integer, YT
waveform at the start and finish points share same
amplitude values and will not cause an
y
interruption to the waveform. If it is non-integral
,
the start and finish amplitude are different, and
high-frequency transient interruption will happen at
joint points, which is called leakage in frequenc
y
domain. To avoid the leakage, FFT mode will
multiply original waveform with one window
function to force the start and finish values all go to
0. Refer t
o
following windows for details
:
Ɣ
Ɣ
Ɣ
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