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某数控装置的输入信号为远距离现场传感器的电压信号。我们知道，电流传输回路由于电流恒定，可以很好地抑制外来杂散电压信号的干扰和噪声，所以远距离信号的传输需要采用电压／电流／电压变换电路。现场传感器输出的电压信号ui经电压／电流变换电路，成为具有恒流源特性的电
The input signal of a CNC device is the voltage signal of the remote field sensor. We know that the current transmission loop can suppress the interference and noise of the external stray voltage signal because of the constant current, so the transmission of the long-distance signal needs to adopt the voltage / current / voltage conversion circuit. Field sensor output voltage signal ui by the voltage / current conversion circuit to become a constant current source of electricity