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Multiplication or division
When multiplication or division is selected, the values of function sources 1 and 2 values will be multiplied or
divided point by point and the results will be displayed.
Multiplication is useful when viewing the power relationship, if one of the channels is proportional to the current.
8.2 FFT Measurement
FFT is used to calculate the Fast Fourier Transform using the analog input channel. FFT record specifies the
digitization time of the source and converts it to the frequency domain. After selecting the FFT function, FFT
spectrum is plotted as amplitude in V-Hz or dB-Hz on the oscilloscope display screen. The reading of the
horizontal axis changes from time to frequency (Hz), while the unit of the vertical axis changes from volt to V or
dB.
Figure 8-3 FFT Window
Open FFT
1) Tap on the lower right corner of the screen to enter the second channel selection area. Tap the soft
key to cycle through the math channel, open the math channel menu, and close the math channel.
2) Tap spectrum type “Line/Decibel” to open the FFT window (see Figure 8-3 FFT Window).
3) Tap the Operation Source box to select the channel for which FFT transform is required.
4) Tap the window box to select the window function applied to the FFT input signal.
Selection of window function
In the FFT transform, four different FFT windows can be selected.
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