不能连接到电路板的接地底盘接地。
客户将发送给我们，DXF文件到SD卡向内转移，这样就不会坐在底盘接地和电路板的接地，但只在PCB的接地。
Customer will be sending us DXF file to shift the SD card inwards so it will not be sitting on both Chasis ground and PCB ground but will only be on PCB ground.
不要捅太多裸铜线通过洞，否则你会触摸接地钢的底盘，造成短路，一旦设备供电，3毫米的裸铜线似乎是不够的。
Don't poke too much bare copper through the holes, or you'll touch the grounded steel of the chassis and cause a short-circuit once the device is powered on, 3 mm of bare copper seemed to be enough.
不要捅太多裸铜线通过洞，否则你会触摸接地钢的底盘，造成短路，一旦设备供电，3毫米的裸铜线似乎是不够的。
Don't poke too much bare copper through the holes, or you'll touch the grounded steel of the chassis and cause a short-circuit once the device is powered on, 3 mm of bare copper seemed to be enough.
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