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.
保护是强制将电路中的一个低阻节点与高阻输入端节点近似等电位的一种技术。
A guard is a low impedance point in the circuit that's at nearly the same potential as the high impedance lead being guarded.
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