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.
辅助阳极：除了在电镀中正常需用的阳极以外，为了改善被镀制件表面上的电流分布而使用的附加阳极。
Auxiliary anodes: in addition to the normal in electroplating need outside anode, and to improve the product plated on the surface of the current distribution and use additional anode.
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