其测量方法是将两个电极放在测试样品的表面，在电极之间施加一个电位差，并测量产生的电流。
It is measured by placing two electrodes on the surface of the test sample, applying a potential difference between them, and measuring the resulting current.
图4 - 16示出6485型皮安计从离子收集电极测量电流的情况，这时仪器工作在地电位。
Figure 4-16 shows a Model 6485 Picoammeter measuring the current from the ion collector, which is operating at ground potential.
采用微机控制的电位测量系统和组合电极实测了电流分布规律及其影响因素。
The current distribution and the factors affecting the distribution are determined experimentally with the segmented electrode method and a computer controlled voltage measurement system.
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