Using Fft Function - Promax OD-610 User Manual

3.1.2

Using FFT function

The FFT (fast Fourier transform) math function mathematically converts a
time-domain waveform into its frequency components. It is very useful for
analyzing the input signal on Oscilloscope. You can match these frequencies with
known system frequencies, such as system clocks, oscillators, or power supplies.
FFT function in this oscilloscope transforms 2048 data points of the time-domain
signal into its frequency components mathematically and the final frequency
contains 1024 points ranging from 0Hz to Nyquist frequency.
Taking the FFT operation for example, the operation steps are as follows:
Press the Math button and call out the Math menu.
Press the H2 button and call out the FFT menu.
Press the F1 button to choose CH1 as the source.
Press F2 button, the windows item will display at the left of the screen,
turn the M knob to select Window, including Rectangle, Hamming,
Hanning and Blackman.
Press F3 button to choose the Format, including dB, Vrms.
Press F4 button, the zoom window will display at the left of the screen,
turn the M knob to zoom in or out the wave of the multiple including
×1, ×2, ×5, ×10.
28
Page
Figure 23. Waveform resulted from CH1 +CH2.
June 2017