Question

在电路图中 这个符号表示 “地” 吗？

.................................0......................
..............................0......................
...........................0......................
.........................0......................
.....00000000000000000000000000
.....0.............. ....0....... ..............0
....0......... .........0......................0
....0........ ..........0......................0
...0............. .....0.....................0
..0..................0......................0
.0..................0......................0.
.0 ................0.....................0
.0................0....................0
0 ................0....................0
0................0....................0

有效的图元素为 0 构成的图形。那跟下面这个 地 有何区别？

000000000000000000000000000
………..0000000000000………
….……….000000000…………
…………….00000……………
………………00……………..

Answer 1

接地有三种：数字地，模拟地，电气地，分别标记为

000000000000000000000000000
………00...........00………
…………00.......00…………
……………00...00……………
………………00……………

000000000000000000000000000
………..0000000000000………
….……….000000000…………
…………….00000……………
………………00……………..

.................................0......................
..............................0......................
...........................0......................
.........................0......................
.....00000000000000000000000000000000000000000000
.....0.............. ....0....... ..............0
....0......... .........0......................0
....0........ ..........0......................0
...0............. .....0.....................0
..0..................0......................0
.0..................0......................0.
.0 ................0.....................0
.0................0....................0
0 ................0....................0
0................0....................0

Answer 2

第一个图是电气电路制图里的“地”，第二个是电子电路里的“地”，不一定分数字和模拟……

Answer 3

上面一个一般是强电电路中的保护地，即零电位。英文用Earth来指示。
下面一个一般是耦合后、或直流区的参考地。即低电位点。英文用PowerGround来指示。