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.
如果离子源偏离地电位，那么离子收集电极多半处在地电位。
If the source of ions is biased off ground, then the ion collector will most likely be at ground potential.
如果离子源偏离地电位，那么离子收集电极多半处在地电位。
If the source of ions is biased off ground, then the ion collector will most likely be at ground potential.
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