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[attachment=140762]  [attachment=140761]  [attachment=140760]  [attachment=140759]  [attachment=140758]  [attachment=140757] 想自制一個4-20ma的信號發生器，準備把擴散硅壓力變送器改裝一下。  但是拆開后看不懂擴散硅反饋的是什么信號。  自己菜鳥級別，無從下手。    特請師傅們有時間時看看能不能把擴散硅去掉換成電位器，能在4-20ma調節。    那4根線和電位器怎樣接。                                                                                                                                                                

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