GND: This pin is the combined control circuitry and powerground.
该引脚是综合控制电路和电源地。
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The analog circuit consists of power-supply modular, signal pickup circuit, analog filter amplifier, gain control circuit, powerground lifting circuit and signal limit circuit of A/D channel.
The methods are able to compute any parameter of grounding grids in power current, such as powerground impedance, touch and step voltage, potential differences within grounding grids and so on.