The Research And Design Of A Virtual Oscillograph Using USB Interface

This text takes virtual oscillograph as an example, has recommended the whole course of the developing the virtual instrument.The virtual oscillograph is made up of the hardware platform and computer with testing software, it is a powerful signal processing system. It can realize the function of the traditional oscillograph but also can store, reproduce, analyse and deal with the waveform. It is high speed, portable, and multi-functionalling.The virtual oscillograph designed this time has the following characteristics: 1, adopt the popular USB interface technology, make the virtual instrument and interface of the computer more convenient, communication is higher in speed. 2, use the high speed Analog to Digital Converters (ADC) to sample at high speed; Use the high-performance programmable logic device (CPLD) to realize the control of the digital circuit at high speed; Use the high-speed large capacity memory (RAM) to keep the data of sampling in real time, this has achieved the high performance of the instrument. 3, use advanced language to design the application program of the host PC, not merely realize that the wave form shows, and deal with the data analysis.The whole paper introduces the background of the virtual instrument and current situation of the virtual oscillograph at first, then carried on the systematic demand and analysed and designed overallly, design from the hardware, software development debug respect detailed introduction develop course technology that run into difficult with the solution, summarized and looked into the distance to originally designing finally.