描述

由于采用了TCP／IP協(xié)議以及100M以太網(wǎng)的傳輸方案,符合國(guó)際標(biāo)準(zhǔn),因此PC端軟件系統(tǒng)的開發(fā)非常方便,本課題采用了美國(guó)NI公司的Labwindows／CVI來開發(fā),它是基于標(biāo)準(zhǔn)C語言的虛擬儀器開發(fā)工具,提供了包括按鈕、換檔開關(guān)、示波器等在內(nèi)的大量人機(jī)界面函數(shù)一以及包括快速傅立葉變換、均方差計(jì)算、數(shù)字濾波等在內(nèi)的信號(hào)處理函數(shù),大大簡(jiǎn)化了開發(fā)進(jìn)程。在CSE808系統(tǒng)中,4510B通信系統(tǒng)板的IP地址為192.168.0198,作為TCP的Server端;主控PC的IP地址為192.168．0.188,作為TCP的Client端。圖4顯示的是測(cè)試得到的I一種CRT顯示器的亮度和兩個(gè)色度信號(hào)的瞬態(tài)波形。顯示器設(shè)置的刷新頻率是85Hz,CSE808系統(tǒng)的采集速率是通道16位并行20kHz。測(cè)試結(jié)果是三個(gè)通道的刷新頻群分別是84.9Hz、85.lHz、85.0Hz,證明系統(tǒng)工作正常。

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