UTD2000 Series User Manual
21
After pressing theMATH button at the menu area to active mathematic operation.
Table 2-2：Math Menu
Function Menu Setting Description
Type Math
Mathematic operation (+、–、×、÷)
Source1
CH1
You can select signal source1 as CH1
or CH2
CH2
Operator
+ Source1+Source2
– Source1–Source2
× Source1×Source2
÷ Source1÷Source2
Source2
CH1
You can select signal source2 as CH1
or CH2
CH2
2.7 FFT spectral analysis
By pressing F1 button again at mathematical operation mode to enter FFT (fast
fourier transform) operation, the time domain (YT) signal can be converted into frequency
domain signal.
At FFT operation, it is convenient to observe signals of the following types:
● Measure harmonic content and distortion in the system
● Display noise characteristic in DC power supply
● Analyze vibration
Table 2-3：FFT Menu Description
Function Menu Setting Description
Type FFT FFT mathematical operation
Source
CH1
You can select signal source as
CH1 or CH2
CH2
Window
Hanning
Set to select Hanning, Hamming,
Blackman, or Rectangle window
function
Hamming
Blackman
Rectangle
Vertical unit
Vrms
Set vertical units as Vrms or
dBVrms
dBVrms
Select FFT window
Assuming that YT waveform is continuously repeated, DSO shall conduct FFT
conversion for time record with finite length. In this case, when the cycle is an integer, YT
waveforms are of the same amplitude at the starting and ending positions, without
interrupting. However, if the cycle of YT waveform is not an integer, the waveform
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