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電子天平構(gòu)造原理

時(shí)間:2011/11/18閱讀:979
分享:
電子天平構(gòu)造原理基本構(gòu)造是相同的。主要由以下幾個(gè)部分組成 :
(1)秤盤(pán):秤盤(pán)多為金屬材料制成 , 安裝在天平的傳感器上 , 是天平進(jìn)行稱量的承受裝置。它具有一定的幾何形狀和厚度 , 以圓形和方形的居多。使用中應(yīng)注意衛(wèi)生清潔 , 更不要隨意掉換秤盤(pán)。
(2)傳感器:傳感器是的關(guān)鍵部件之一 , 由外殼、磁鋼、極靴和線圈等組成 , 裝在秤盤(pán)的下方。它的精度很高也很靈敏。應(yīng)保持天平稱量室的清潔 , 切忌稱樣時(shí)撒落物品而影響傳感器的正常工作。
(3)位置檢測(cè)器 位置檢測(cè)器是由高靈敏度的遠(yuǎn)紅外發(fā)光管和對(duì)稱式光敏電池組成的。它的作用是將秤盤(pán)上的載荷轉(zhuǎn)變成電信號(hào)輸出。
(4)PID 調(diào)節(jié)器:PID( 比例、積分、微分 ) 調(diào)節(jié)器的作用 , 就是保證傳感器快速而穩(wěn)定地工作。
(5)功率放大器:其作用是將微弱的信號(hào)進(jìn)行放大 , 以保證天平的精度和工作要求。
(6)低通濾波器:它的作用是排除外界和某些電器元件產(chǎn)生的高頻信號(hào)的干擾 , 以保證傳感器的輸出為一恒定的直流電壓 o
(7)模數(shù) (A/D) 轉(zhuǎn)換器:它的優(yōu)點(diǎn)在于轉(zhuǎn)換精度高 , 易于自動(dòng)調(diào)零能有效地排除干擾 , 將輸入信號(hào)轉(zhuǎn)換成數(shù)字信號(hào)。
(8)微計(jì)算機(jī):此部件可說(shuō)是電子天平的關(guān)鍵部件了 o 它是電子天平的數(shù)據(jù)處理部件 , 它具有記憶、計(jì)算和查表等功能 o
(9)顯示器:現(xiàn)在的顯示器基本上有兩種 : 一種是數(shù)碼管的顯示器 ; 另一種是液晶顯示器。它們的作用是將輸出的數(shù)字信號(hào)顯示在顯示屏幕上。
(10)機(jī)殼:其作用是保護(hù)電子天平免受到灰塵等物質(zhì)的侵害 , 同時(shí)也是電子元件的基座等。
(11)底腳:電子天平的支撐部件 , 同時(shí)也是電子天平水平的調(diào)節(jié)部件 , 一般均靠后面兩個(gè)調(diào)整腳來(lái)調(diào)節(jié)天平的水平

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