When measuring the charge on a device such as a capacitor, it's important to disable the zero check of the electrometer first, and then connect the capacitor to the high impedance input terminal.
在测量一个器件，如电容器上的电荷时，重要之点是要首先关闭静电计的零点检查功能，然后再将电容器连到高阻抗输入端。
At present most of manufacturers filter 3rd harmonic by using Angle glaucoma connection capacitor to connect 14.5 reactance, in fact there is only slight effect.
目前大部分厂商采用角型连接电容器串接14.5%电抗器滤除3次谐波，其实作用甚微。
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