所以在构建测试夹具和进行弱电流及高阻抗连接时，尽量减少绝缘体之间及导体之间的接触也是很重要的。
Therefore, it's important to minimize contact between insulators as well as conductors in constructing test fixtures and connections for low current and high impedance.
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.
在有些应用中，例如监测电化电池和测量半导体的电阻系数，则可能必须进行高阻抗电压切换。
High impedance voltage switching may be necessary in applications such as monitoring electrochemical cells and measuring semiconductor resistivity.
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