试验电荷是为了探测电场，定量地描述电场性质而人为引入的一个理想电荷。
试验主体戴着含有60个电极的帽子，以此来测量由脑部产生的电荷。
The subjects wear a cap fitted with 60 electrodes, with the aim of measuring the electricity generated by the brain.
针对不均匀电场(棒-板间隙)中绝缘板上残余电荷对50%冲击闪络电压u _(50)的影响做了一些试验研究。
The effect of charges remaining on a dielectric plate upon the 50% impulse surface flashover voltage U_ (50) in the non-uniform field (rod-plane gap) is investigated.
最后根据树枝化击穿试验结果，分析讨论了空间电荷对发散电场的影响。
On the basis of experiment of electrical tree initiation, the effects of space charges on divergent fields are discussed.
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