Abstract
The system is based on digital signal processing technology, takes MSP432P401R single-chip microcomputer as the main controller, uses the on-board ADC to convert the input signal into a digital signal, and then carries out FFT transformation to obtain the amplitude of each harmonic component, so as to carry out spectrum analysis and calculate THD/ THDo/ Δ values for further signal processing. The system realizes the signal processing and the calculation of distortion and distortion measurement error and expands the functions of calculating the normalized amplitude of the fundamental wave and harmonic and recovering the input signal waveform. Distortion measurement error value Δ ≤3%, can process signal amplitude range 30mV~600mV, fundamental frequency range 1kHz~100kHz, and the calculation and processing time is less than 10 seconds.
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