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在电路图上,我们经常可以看到许多“⊥”的符号,这就是大家常说的“接地”或“地”。在焊接电路时,要把标有这种“接地”符号的各点用导线连接起来;如果是金属底板,通常是把各“接地”点直接焊接在底板上;如果是印刷电路板,则由铜箔把各接地点连在一起。虽然我们把它叫做“接地”,但很多电子设备的“地”并没有真正和大地连接。那么为什么把“⊥”符号叫做“接地”呢?它有什么实际意义呢?
On the circuit diagram, we often see many “⊥” symbols, which is commonly known as “ground” or “ground.” When soldering the circuit, the points marked with this “ground” symbol are to be connected by wires; in the case of a metal base plate, the “ground” points are usually soldered directly to the base plate; in the case of a printed circuit board, Copper foil to the ground point together. Although we call it “grounded,” many of the “ground” of electronic devices are not really connected to the ground. So why the “⊥” symbol is called “grounding”? What is the real meaning of it?