如果切换系统中会混合出现小电流、高电压和高频信号，屏蔽则非常关键。
Shielding may be essential in a switching system if a mixture of low current, high voltage, and high frequency signals are present.
和接触电势一样，由于偏移电流而引起的小电流信号测量不确定度亦可计算获得。
As with the contact potential, the uncertainty added to a small current signal by the offset current can be calculated.
依据自动控制理论中的小信号理论，小电流TIG焊的电弧具有线性系统的特征。
According to small signal theory of automation theory, arc of low current TIG welding can be considered as a linear system.
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