摘 要
针对传统示波器功能单一、不方便更新升级的缺陷，本文基于虚拟仪器软件LabVIEW和NI PCI-6221数据采集卡设计并实现了一种多功能虚拟示波器，该虚拟示波器不仅具有采集和显示实际信号时域波形的功能，还具有信号产生、波形存储等功能。
测试结果表明，该虚拟示波器既能够产生和显示正弦波、三角波、方波和锯齿波等四种常见仿真信号，又能够采集和显示实际物理信号，还可以实现波形的存储和回放，同时具有双综显示、通道选择、波形平移与缩放、触发方式选择和信号时域参数测量等功能。与传统示波器相比，具有功能多、更新升级方便和操作方便等优点，可广泛应用于信号时域分析和课程教学等场合。
关键词：虚拟仪器；虚拟示波器；数据采集卡；LabVIEW
ABSTRACT
Aiming at the defects of single function and inconvenient upgrade of traditional oscilloscopes, this paper designs and implements a multi-functional virtual oscilloscopes based on LabVIEW and Ni PCI6221 data acquisition card. The virtual oscilloscopes not only have the functions of collecting and displaying the time domain waveform of actual signals, but also have the functions of signal generation and waveform storage.
The test results show that the virtual oscilloscope can not only generate and display four common simulation signals, such as sine wave, triangle wave, square wave and sawtooth wave, but also collect and display the actual physical signals. It can also realize the storage and playback of waveforms. At the same time, it has the functions of dual display, channel selection, waveform translation and scaling, trigger mode selection and signal time domain parameter measurement. Compared with the traditional oscilloscope, it has many advantages, such as multi-function, convenient update and operation. It can be widely used in signal time domain analysis and course teaching.
Key words: Virtual instrument,Virtual oscilloscope,Data acquisition card,LabVIEW
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