低频模拟信号波形显示分析器设计的论文毕业设计论文.doc

低频模拟信号波形显示分析器设计的论文 摘 要 传统的示波器其功能完全依靠硬件实现，功能单一且维护费用高，更重要的是功能一旦确定便不能更改。利用LabVIEW做成的虚拟仪器是将虚拟技术，计算机技术，总线技术，和软件技术紧密结合在一起，利用计算机强的数字处理能力实现了仪器的大部分功能，打破了传统仪器的框架，形成了一种新的仪器模式。为此，本文提出了低频模拟信号显示分析器。 低频模拟信号显示分析器主要分为上位机和下位机两部分，下位机主要是利用C8051F340单片机对信号采样并将得到的信号通过USB接口发送给PC机。上位机主要是由PC机端的GUI界面进行波形显示、存储、频谱分析，而且PC机端的GUI界面主要利用LabVIEW来实现。软件上，波形进行采样并通过USB发给PC机，利用LabVIEW虚拟仪器设计一个示波器进行波形显示和频率分析。硬件上先将产生的模拟信号发送到A/D转换器上,使其转换为数字信号,经过调试，最后验证本设计实现了以上所提到的功能，具有合理可行性。 经过对本设计的功能进行仔细分析，在论文开始得出了系统的总体设计方案，接着从硬件、软件两部分对系统的设计方案进行了详细描述，最后又通过系统的调试和分析验证了系统功能特性。C8051F340，频谱分析，LabVIEW，PC机，USBABSTRACT Traditional oscilloscope function completely dependent on hardware implementation with single function and the high cost of maintenance, it is more important function cannot change once established. Using the LabVIEW virtual instrument is made of the virtual technology, computer technology, bus technology, and software technology closely together. It use computer powerful digital processing ability realize the instrument most of the functions, breaking the traditional instruments of the framework, formed a new instrument mode. To this end, this paper presents a low frequency analog signal display analyzer design. Low frequency analog signal analyzer design is mainly divided into two parts of the upper machine and lower machine. Lower machine mainly used C8051F340 MCU of signal sampling and signal will be sent to PC through USB interface. Upper machine mainly by the PC to the GUI interface for waveform display store spectrum analysis. On the software, I/O port, timer, ADC, initialized clock, and then to generate the waveform sampling and via USB to a PC Then the waveform sampling and via USB to a PC. In the PC using the LabVIEW virtual instrument design an oscilloscope waveform display and frequency analysis. On the hardware, we will produce the first on the analog signal sent to the A/D converter, so that it is converted to digital signals . PC to the GUI interface displayed waveform and frequency sp