基于虚拟仪器的虚拟信号发生器和示波器的实现

　　基于虚拟仪器的虚拟信号发生器和示波器的实现
　　摘要：本文介绍了虚拟仪器的基本框架和总体设计思想。在此基础上，利用虚拟仪器开发平台LabVIEW和数据采集卡PCI-6024E设计了1种基于虚拟仪器的函数信号发生器和虚拟多功能示波器。
　　为了弥补常规函数信号发生器无任意波输出的不足，虚拟函数信号发生器以数据采集卡为输出设备，采用虚拟仪器技术，设计并实现了基于虚拟仪器的函数信号发生器。该函数信号发生器除了能产生常规的信号外，还能产生根据用户输入函数表达式的信号，实现了对现用常规信号源功能的扩展。
　　虚拟示波器它不但具有传统示波器波形显示控制的功能，而且还对传统示波器的功能进行了扩展， 实现了参数自动测量显示、波形读写等传统示波器无法实现的新功能，并将波形显示、电压测量、频谱分析等功能融入仪器设计中， 构成了全新的多功能示波器。最后，利用数据采集卡PCI-6024E采集信号发生器的数据，对其各项功能分别进行了测试和分析，测试结果表明该虚拟多功能示波器达到了相应的技术指标。
　　关键词  虚拟仪器；函数信号发生器；虚拟多功能示波器；PCI-6024E采集卡；LabVIEW
　　Realization of Virtual signal generator and Oscilloscope
　　based on Virtual instrument
　　Abstract: This thesis introduced the basic framework and design ideas of virtual machines. On this basis, based on the software LabVIEW of virtual instrument and data acquisition card PCI-6024E,based on a virtual functional signal generators of virtual instrument and a kind of virtual mutil-functions Oscilloscope is introduced in this thesis.
　　In order to compensate the defect of normal functional signal generators without arbitrary waveforms output a virtual functional signal generator was designed and realized using data acquisition card as output device．The virtual functional signal generator can generate not only standard  waveforms，but also various user-defined waveforms，so the functions of normal signal source have been expanded．
　　This virtual scope not only has the functions achieved in traditional scope such as waveform display and control,but also achieves some expanded functions which cant be achieved in traditional scope. For example, the parametern can be measured and displayed autorn aticly, the waveform can be saved and readed freely and so on. There are the other new functions such as waveform display, voltage correlation analysis digital filter, frequency response analysis etc. So this is a fresh multi-functions scope. The all functions of the virtual multi-functions DSO are tested and analyzed with the data acquisition card PCI-6024E.The testing results prove that the virtual multi-functions DSO attains the relevant technical target.
　　Key Words  virtual instrument；functional signal generators；virtual mutil-functions Oscilloscope；data acquisition card PCI-6024E；LabVIEW