Hello engineer, the signal map I got after measuring the data in real time, the ordinate range is about -1.5-1.5. When I shut down the web server, executed the csv file after fft_scan the script file, and imported the first column of time data data into MATLAB, the graph obtained was very different from the real-time measurement, the amplitude was reduced by ten times, I changed the sampling frequency in the script file to the same as the sampling frequency monitored by the website, but the sample size was different, I wanted to ask why the difference between the waveform spectrum displayed after importing MATLAB and the website monitoring is so large.
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ninamihalios
Hello engineer, the signal map I got after measuring the data in real time, the ordinate range is about -1.5-1.5. When I shut down the web server, executed the csv file after fft_scan the script file, and imported the first column of time data data into MATLAB, the graph obtained was very different from the real-time measurement, the amplitude was reduced by ten times, I changed the sampling frequency in the script file to the same as the sampling frequency monitored by the website, but the sample size was different, I wanted to ask why the difference between the waveform spectrum displayed after importing MATLAB and the website monitoring is so large.
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