PMC-2/11/05/000/00/00/01/00/00

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描述

PMC-2/11/05/000/00/00/01/00/00
數(shù)字萬用表由于具有測量精確、取值方便、功能齊全等優(yōu)點(diǎn),因此深受無線電愛好者的歡迎、最普通的數(shù)字方用表一般具有電阻測量、通斷聲響檢測、二極管正向?qū)妷簻y量。交流直流電壓電流測量、三極管放大倍數(shù)及性能測量等。有些數(shù)字萬用表則增加了電容容量測量、頻率測量、溫度測量、數(shù)據(jù)記憶及語音報數(shù)等功能,給實(shí)際檢測工作帶來很大的方便。但是,數(shù)字方用表由于使用不當(dāng),在實(shí)際檢測時易造成表內(nèi)元件損壞,產(chǎn)生故障。本人根據(jù)造成數(shù)字萬用表損壞的實(shí)際情況,總結(jié)出數(shù)字方用表在使用中的注意事項(xiàng),供初學(xué)初用者參考,以盡量防止數(shù)字萬用表的損壞。
有些數(shù)字萬用表損壞是由于測量的電壓電流超過量程范圍所造成的.如在交流20V檔位測量市電,很易引起數(shù)字萬用表交流放大電路損壞,使萬用表失去交流測量功能。在測量直流電壓時,所測電壓超出測量量程,同樣易造成表內(nèi)電路故障。在測量電流時如果實(shí)際電流值超過量程,一般僅引起萬用表內(nèi)的保險絲燒斷,不會造成其它損壞。所以在測量電壓參數(shù)時,如果不知道所測電壓的大致范圍,應(yīng)先把測量檔置于最高檔,通過測量其值后再換檔測量,以得到比較精確的數(shù)值。如果所要測量的電壓數(shù)值遠(yuǎn)超出萬用表所能測量的最大量程,應(yīng)另配高阻測量表筆。
數(shù)字萬用表損壞在大多數(shù)情況下是因測量檔位錯誤造成,如在測量交流市電時,測量檔位選擇置于電阻擋,這種情況下表筆一旦接觸市電,瞬間即可造成萬用表內(nèi)部元件損壞。因此,在使用萬用表測量前一定要先檢查測量檔位是否正確。在使用完畢,將測量選擇置于交流750V或者直流1000V處,這樣在下次測量時無論誤測什么參數(shù),都不會引起數(shù)字萬用表損壞.
數(shù)字萬用表的直流電壓上限量程為1000V,因此測量直流電壓時,最高電壓值在1000V以下,一般不會損壞萬用表。如果超出1000V,則很有可能造成萬用表損壞。但是,不同的數(shù)字萬用表的可測量電壓上限值可能有所不同。如果測量的電壓超出量程,可采取電阻降壓的方法加以測量。另外,在測量40O~1000V的直流高電壓時,表筆與測量處一定要接觸好,不能有任何抖動,否則,除了可能會造成萬用表損壞而使測量不準(zhǔn)確外,嚴(yán)重時還可使萬用表無任何顯示.?在測量電阻時,應(yīng)注意一定不要帶電測量。

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優(yōu)勢價格,大量現(xiàn)貨。

主營DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國內(nèi)實(shí)力庫存商家


選擇深圳長欣,選擇放心,售后無憂大量現(xiàn)貨,當(dāng)天順豐發(fā)貨!
主營:本特利,英維思,伍德沃德,福克斯波羅、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂,ACSO,力士樂等各大品牌的DCS系統(tǒng)配件,機(jī)器人系統(tǒng)配件,大型伺服系統(tǒng)備件。

先介紹幾點(diǎn)經(jīng)驗(yàn)。
1、先通讀一遍“系統(tǒng)手冊”(不管能不能看懂,先了解個大概,以便學(xué)習(xí)編程時查找);
2、由位控邏輯入手,逐漸增加定時、計數(shù)等條件,把或、與、非關(guān)系理順;
3、進(jìn)而練習(xí)整數(shù)運(yùn)算、實(shí)數(shù)運(yùn)算、類型轉(zhuǎn)換;
4、量程轉(zhuǎn)換、PID調(diào)節(jié)回路的建立及P、I、D參數(shù)的理解(最好是有個物理回路驗(yàn)證,比如變頻器+電機(jī)+測速傳感器);
5、循環(huán)、順序、跳轉(zhuǎn)等程序控制(盡量避免跳轉(zhuǎn),非跳不可時也是跳的越近越好);
6、中斷、通訊、位置控制....

本人以ABB工業(yè)機(jī)器人配件DSQC系列和Motorola MVME系列,GE 卡件 模塊 驅(qū)動器系列為主攻。各位電工朋友可根據(jù)自己的條件選擇適合自己的PLC品牌,由于PLC的基本框架大同小異,學(xué)會一種至于其它的學(xué)習(xí)起來也就簡單了。