Method of software control for excitation signal source
                                                                     ZOU Qin wen, WANG Ying
                             (Faculty of Machanical Engineering & Automation, Zhejiang Sci Tech University, Hangzhou 310018, China)

Abstract: Aiming at the problem of the demand of a variety of excitation signal sources in the process control and automation process, and the problem that the type of excitation signal sources is single,and the sources have narrow application range, and are inconvenient adjustment which were generated by conventional method, the method of generating the excitation signal source was studied. Using LabVIEW as the virtual instrument software development platform, the basic waveform, the formula waveform and the special pulse waveform generation program were designed. Combined with PXI bus technology, the data acquisition cards and oscilloscopes were used to complete a variety of signal source generation and testing. The results show that the excitation signal source generated by this method is more and more stable, the parameter is easy to adjust, the precision is higher and the function is more. The resulting signal source is stable and reliable, suitable for engineering practice.

Key words: excitation signals; LabVIEW; data acquisition card; pulse waveform