Design And Realization Of Signal Distortion Measurement System Based On Virtual Instruments

Based on virtual instrument technology,the traditional distortion measurement system is redesigned by using a digital method。To make up functions of the traditional distortion measurement system,The system increases a computer interface and human-machine interface with many operating functions,implements online and offline data analysis。Distortion measurement technology and virtual instrument technology have combined to enhance the overall level of the measurement system。The new distortion measurement system is in line with the requirements of the information age,and meet the market demand。It is achieve the purpose which the new system as a replacement of import distortion measurement system。It is significance to promoting the development of China's information industry measurement。This paper gives a idea of design the distortion measurement system,which is using the virtual instrument technology and the digital method of spectral analysis,and gives a general design。View of the measurement principle of digital method Distortion 0.01% of the technical difficulty and demand distortion measure,the use of MATLAB language windowing function,A/D converter resolution in bits,A/D converter sampling rate and the fast Fourier transform Several aspects of the series this simulation to determine the distortion based on virtual instrument measurement system used in the selection of the core components of the technical indicators。For the Distortion measurement system,it is eventually selected the NI USB-6251 data acquisition as a hardware platform,and LabVIEW virtual instrument software as a development platform。The system through a third party tested。The main subjects of innovation are the following:⑴. The virtual instrument technology to measure the distortion field;⑵. Using digital method of spectral analysis method to measure the distortion of the core unit of the digital design; ⑶. Provides a simulation using MATLAB to achieve low distortion indicators of the core components of the measurement system to verify the method;⑷. Distortion measurement system designed to achieve automatic input signal distortion measurement, no manual range switching;...