Reseach On Marching-on In-time Scheme And The Fast Algorithm Of Time Domain Integral Equation

The oscilloscope is the eye of electronic engineers and the most widely used measurement instrument. Selecting the scope as a practical teaching system is good for instrument majors’ understanding of the instrument system’s constitution, the hardware design of key modules, the interface technology of instrument interconnection. It has a strong practical significance.The issue is about the “oscilloscope practice teaching system design and implementation theme, the oscilloscope provides a set of programmable and practical teaching experiment board based on the typical structure of a digital storage oscilloscope. The test board has signal conditioning circuit, trigger circuit, data acquisition circuit, DSP processor, and network interface. It not only helps students apply digital circuits, analog circuits, and microcomputer principle knowledge learned in college, but also helps them get a concept of modern measuring instrument systems and networked automatic test system.The experimental system is designed by referring to currently commercially available oscilloscope’s indicators, appropriately reduce the difficulty of its implementation. The system’s signal channel consists of the attenuation network,coupling mode selection circuit, impedance transformation circuit, bandwidth limitation circuit, and controllable amplification circuit. It provides a platform for students to do some experiments about signal channel characteristics. The trigger circuit includes attenuation network, coupled mode selection circuit, edge trigger circuit and video trigger circuit. Users can carry out experiments related to trigger channel characteristics on the hardware platform. The system uses a controllable sampling chip for signal sampling. Users can carry out experiments about sampling data calibration and multiple data acquisition modes by switching its sampling mode as needed. It realizes oscilloscope’s acquisition system by programmable logic chip, users can make digital logic design by this chip. It use embedded systems constituted by DSP to realize data processing. Students can get a good design capacity of embedded software systems by some experiments of this chip. This system provide an actionable remote control command interface of LXI, students can design and verify instrument functions through the interface. What is more, students can realize the web server required by LXI-C classinstruments, master the B-S network programming.This system provides a reference design for each experiment, and all verified by.