Mike Krzyzewski is really a famous coach of Dream Team. She has coached north america men's basketball team for some time, that's clinched numerous medals for his country. Following Londonfl jerseys supplyn Olympic was over, Krzyzewski told The Associated Press that this game will be his final one as national coach, a job he's held for seven years. He had left open the possibility of swomen nfl jerseystaying with the team beyond the London Games, when practice on Saturday said these will be his last Olympics.When asked if he was sure, Krzyzewski didn't hesitate before again saying, "yecheap nfl jerseys wholesales," this will be his last game "If we could win it, then it might be three major championships in a row, i always do not know when that has been done because we haven't usually won http://govoriotkrito.bg/libs/nflcn08.htmthe globe championships," Krzyzewski said. "It becomes an enormous thing for the program." Whatever, he's an awesome coach. His achievement are going to be remembered by the country.cheap nfl jerseys
  • <sup id="cpttk"><center id="cpttk"><input id="cpttk"></input></center></sup>

  • <mark id="cpttk"><center id="cpttk"><dl id="cpttk"></dl></center></mark><s id="cpttk"></s>
  • <s id="cpttk"><i id="cpttk"><form id="cpttk"></form></i></s>

      1. DTSF、DSSF三相電子式多費率電能表工作原理

        2014/3/11 8:29:28      點擊:

        DTSF、DSSF三相電子式多費率電能表 工作原理2.1 電能計量單元工作原理本儀表電能計量單元的核心是ADE7755芯片。被計量的每一相電能的電流通過互感器采樣得到電壓信號,再通過ADE7755芯片內(nèi)部的差放電路將電壓信號放大,放大的信號經(jīng)過A/D轉(zhuǎn)換成與其成比例的數(shù)字信號,再經(jīng)過高通濾波去除信號中的直流分量后進(jìn)入數(shù)字乘法器的一個輸入端。被計量的電能電壓信號經(jīng)過電阻分壓取樣,通過ADE7755芯片內(nèi)部的差放電路將信號放大,再經(jīng)過A/D轉(zhuǎn)換成與其成比例的數(shù)字信號,進(jìn)入數(shù)字乘法器的另一個輸入端與電流通道的信號進(jìn)行乘法運算,完成計量電能的瞬時功率測量。每相輸出瞬時功率通過數(shù)字低通濾波器,進(jìn)行積分處理,然后進(jìn)行絕對值累加后進(jìn)入"數(shù)字/頻率"轉(zhuǎn)換器,經(jīng)過分頻電路輸出的脈沖經(jīng)過隔離后送入CPU單元進(jìn)行處理。2.2 CPU單元工作原理電能計量單元輸出的高頻脈沖通過光電耦合器,一路作為無源脈沖輸出用于出廠檢驗和用戶對電能表進(jìn)行校驗;另一路送到CPU芯片進(jìn)行數(shù)據(jù)處理。CPU在系統(tǒng)(電能表程序)指令下,根據(jù)數(shù)據(jù)存儲器中的記憶及儀表常數(shù)計算出有功的電量值,再轉(zhuǎn)存到內(nèi)部存儲器中,存儲的數(shù)據(jù)既可以通過液晶LCD顯示, 又可以通過紅外和RS485兩種通迅方式輸出。

        国产无码在线一区二区观看,人妻av乱片aV出轨中文字幕,18禁在线永久免费观看网站,色综合无码av网站 国产性色在线视频 日韩中文字幕在线
      2. <sup id="cpttk"><center id="cpttk"><input id="cpttk"></input></center></sup>

      3. <mark id="cpttk"><center id="cpttk"><dl id="cpttk"></dl></center></mark><s id="cpttk"></s>
      4. <s id="cpttk"><i id="cpttk"><form id="cpttk"></form></i></s>