必须增加一个附加电压去克服这样引起的位垒。
An added voltage is necessary to overcome the barrier thus created.
在测量仪器上附加电流和电压源功能，为各种低电平测量应用提供了额外的灵活性。
Adding current and voltage sourcing capabilities to a measuring instrument provides an extra degree of versatility for many low level measurement applications.
而保护意味着使用保持在与高阻抗电路相同电位的附加的低阻抗导体来阻止可能的干扰电压或电流。
Guarding implies the use of an added low impedance conductor, maintained at the same potential as the high impedance circuit, which will intercept any interfering voltage or current.
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