rexroth放大器于控制一個(gè)或兩個(gè)比例電磁閥,如控制一個(gè)可反向軸向柱塞單元或一個(gè)閥片。rexroth放大器在不需要復(fù)雜操作以及只需要少量輸入/輸出的應(yīng)用場(chǎng)合,RA模擬放大器可以用作數(shù)字控制器的廉價(jià)替代品。無需其他工具,可以直接在設(shè)備上通過電位計(jì)對(duì)放大器進(jìn)行參數(shù)設(shè)置。
增加信號(hào)幅度或功率的裝置,它是自動(dòng)化技術(shù)工具中處理信號(hào)的重要元件。放大器的放大作用是用輸入信號(hào)控制能源來實(shí)現(xiàn)的,放大所需功耗由能源提供。對(duì)于線性放大器,輸出就是輸入信號(hào)的復(fù)現(xiàn)和增強(qiáng)。對(duì)于非線性放大器,輸出則與輸入信號(hào)成一定函數(shù)關(guān)系。放大器按所處理信號(hào)物理量分為機(jī)械放大器、機(jī)電放大器、電子放大器、液動(dòng)放大器和氣動(dòng)放大器等,其中用得 廣泛的是電子放大器。隨著射流技術(shù)(見射流元件)的推廣,液動(dòng)或氣動(dòng)放大器的應(yīng)用也逐漸增多。電子放大器又按所用有源器件分為真空管放大器、晶體管放大器、固體放大器和磁放大器,其中又以晶體管放大器應(yīng)用 廣。在自動(dòng)化儀表中晶體管放大器常用于信號(hào)的電壓放大和電流放大,主要形式有單端放大和推挽放大。此外,還常用于阻抗匹配、隔離、電流-電壓轉(zhuǎn)換、電荷-電壓轉(zhuǎn)換(如電荷放大器)以及利用放大器實(shí)現(xiàn)輸出與輸入之間的一定函數(shù)關(guān)系(如運(yùn)算放大器)。
REXROTH力士樂放大器所產(chǎn)生的直流誤差使失調(diào)和失調(diào)漂移降到 低。在-40℃~ 125℃溫度范圍內(nèi),它具有10μV 大輸入失調(diào)電壓和65nV/℃ 大輸入失調(diào)電壓漂移。DIGIN是單線串行接口,通過它對(duì)放大器的增益和輸出失調(diào)進(jìn)行調(diào)整設(shè)置,增益調(diào)整范圍是70~1280,二級(jí)放大器的增益可以分別單獨(dú)進(jìn)行設(shè)置和調(diào)整,調(diào)整到預(yù)定的增益值后,再利用DigiTrim多晶硅熔絲技術(shù)固定放大器的增益設(shè)置,實(shí)現(xiàn)增益*設(shè)定。*級(jí)增益調(diào)整通過調(diào)整Pl和P2的128步7bit編碼進(jìn)行,范圍為4.00~6.40;第二級(jí)增益調(diào)整通過調(diào)整P3和P4的8步3bit編碼,范圍為17.5~200。在*性固定放大器的增益設(shè)定值之前,為獲得 佳校準(zhǔn)精度,可暫時(shí)在路設(shè)置和反復(fù)調(diào)節(jié)調(diào)整值。*級(jí)增益與編碼值的關(guān)系見公式(1);第二級(jí)增益與編碼值的關(guān)系如表l所列,放大器總增益GAlN=CAIN1xGAIN2。放大器的輸出電壓VOUT可由公式(3)算出,其中GAIN為電路對(duì)于差分輸入的默認(rèn)內(nèi)部初始增益,大小為70。當(dāng)2個(gè)輸入都接地時(shí),因*項(xiàng)接近0德國*力士樂rexroth電子比例放大器
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