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14.1 Mathematical Function
Use operator
“
+” ,“-”,“x”,“÷” to operating the channel waveform to get the math waveform.
(1) Operator
Operator supports
“
+”
,“-”,“x”,“÷”.
a. +
：
The waveforms of source 1 and source 2 are added point by point.
b. -
：
The waveforms of source 1 and source 2 are subtracted point by point.
c.
x
：
The waveforms of source 1 and source 2 are multiplied point by point.
d.
÷：
The waveforms of source 1 and source 2 are divided point by point.
14.2 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 by using
FFT:
Harmonic content and distortion in measurement system
；
Perform the noise feature in DC power supply
；
Vibration Analysis
；
(1) Vertical Unit
The unit of the FFT operation result can select Vrms and dBVrms. Vrms and dBVrms display the
vertical amplitude size in a linear way and decibel volts way. If the FFT spectrum need to display in
a large dynamic range, dBVrms is recommended.
(2) Frequency Range
a. Range
Start Frequency
：
Set the start sweep frequency of FTT.
End of Frequency
：
Set the end sweep frequency of FTT.
Follow
：
It can set ON or OFF. ON: start frequency and end of frequency will be linkage. OFF:
start frequency and end of frequency will not be linkage.
b. Bandwidth
Center Frequency
：
Set the center frequency of the FFT waveform and the FFT waveform will
be changed accordingly.
Frequency Bandwidth
：
Set the sweep frequency of bandwidth.
(3) FFT Count
Perform a data count of FFT operation, the count larger the resolution is higher, the corresponding
refresh speed will be slower. It can set to 8K, 16K, 32K, 128K, 256K, 512K and 1M.
