Relay contacts should be shielded from the coil to minimize induced noise from the relay power supply. 继电器触点和线圈之间应该屏蔽，以使继电器电源引起的感应噪声最小。
Differential signals can help nullify the effects of ground shifts and induced noise signals that can appear as common mode voltages on a network. 差分信号有助于消除在网络中作为共模电压出现的接地偏移和感应噪声信号的影响。
