[attachment=140762]  [attachment=140761]  [attachment=140760]  [attachment=140759]  [attachment=140758]  [attachment=140757] 想自制一個(gè)4-20ma的信號(hào)發(fā)生器，準(zhǔn)備把擴(kuò)散硅壓力變送器改裝一下。  但是拆開(kāi)后看不懂?dāng)U散硅反饋的是什么信號(hào)。  自己菜鳥(niǎo)級(jí)別，無(wú)從下手。    特請(qǐng)師傅們有時(shí)間時(shí)看看能不能把擴(kuò)散硅去掉換成電位器，能在4-20ma調(diào)節(jié)。    那4根線和電位器怎樣接。                                                                                                                                                                

這玩意我用324做過(guò)，麻煩不說(shuō)，還不穩(wěn)定，給你一個(gè)簡(jiǎn)單的電路圖，注意電阻的功率就行