一种基于TMS320F28379D的总谐波失真测量系统

his paper designs and introduces a system which can adapt to different signal amplitude and fundamental frequency to obtain relatively accurate total harmonic distortion of signal. The system is mainly composed of core control module, shaping module, amplification module, display module and communication module. Firstly, the signal is preprocessed through the shaping module and amplification module. The core control module of TMS320F28379D single chip microcomputer is used to collect and obtain the fundamental frequency and amplitude of the input signal, confirm the appropriate sampling frequency and adjust the amplification factor; Then re collect and calculate the properly amplified signal, and finally display the signal waveform, normalized amplitude of fundamental wave and harmonic, distortion rate and other data on the screen. At the same time, send the data to the mobile phone app through the Bluetooth module for display. According to the test results, the system can stably collect and calculate various data of the signal and display, and can obtain ideal total harmonic distortion accuracy in a certain range.