| The virtual instrument is a metrical instrument based on the computer. It has a lot of advantedge compared with the traditional instrument. The development on this kind of instrument is fast these years. We were considering a new kind of virtual instrument system with DSP, for the sake of the innovation, intelligentize, and conveniency. This system has finished shese electric parameters in the electric experiments sunch as: AC voltage, AC current, direct voltage, direct current, resistance, capacitance, inductance etc. this system also contains the modules like digital oscillograph, and the signal generator.The hardware of this system contains signal circuits, the system of the DSP, usb interface and the human-machine interface systems. The emphases of the chapter were the design of the hardware. We point out the measure principle and the arithmetic in this system in the meantime.The application of the virtual instrument was wroten in c languages. We use the virtual faceplate as the human-machine interface. This part has implemented the calculation of the signal, the display of the wave and the memory of the data. We emphasized on the method of the the procedure exploitation , including the data collection, the conversion of the measurement, the digital filter, and the module of the parameters measurement.In the last of this chapter, we indicated the main problems of this system. |
