本文报道一种由电子轰击型离子源、扇形磁分析器与法拉第筒式离子检测器组成的小型质谱计，介绍其设计参数、结构与性能。

This paper report the design parameters, construction and specificity of a small magnetic mass spectrometer with an EI ion source, a sector magnetic analyser and a Faraday cup ion detector.

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可以把物体放在法拉第杯中，用静电计测量其电荷。

This can be done by placing the object in a Faraday cup and measuring the charge with an electrometer.

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