利用连接到电路中一个低阻点的导体，将信号通路包裹起来，即实现了静电屏蔽，该低阻点最好是测量设备的LO输入端子。
Electrostatic shielding is provided by surrounding the signal path with a conductor connected to a low impedance point in the circuit, preferably the lo input terminal of the measuring device.
在切换低阻时，屏蔽要求是最低的。通常只有在电噪声丰富的环境下才需要屏蔽。
When switching low impedances, shielding needs are minimal. Shielding is generally needed only in electrically noisy environments.
各种低阻测量的应用包括：接触电阻、超导体电阻和导体电阻率的测量等。
Low resistance measurement applications include contact resistance, superconductor resistance, and resistivity measurements of conductors.
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