从自主研发的角度，提出了基于虚拟仪器的数字示波器的一种新的设计方法，该方法对数据采集卡硬件设计和配套软件的开发进行了研究。采用PCI接口，用DMA方式传输据，使得采样频率可达100MHz，用户可通过软面

板设置采样参数，采集的数据先送到系统内存，再直接以波形形式显示到软面板上，或者以数据文件格式存到Pc机硬盘。该虚拟示波器已成功运用于弱电信号的采集。-Independent research and development from the perspective of virtual instrument based on the digital oscilloscope, a new design method of data acquisition card hardware design and software development were studied. Using PCI interface, using DMA transfer, according to which the sampling frequency up to 100MHz, users may set up through the soft-panel sampling parameters, collecting data to system memory first, and then directly to the waveform display to the soft-panel, or data file format onto your hard drive Pc. The virtual oscilloscope has been successfully applied to weak signal acquisition.