Note the top electrode is guarded, so that only current flowing across the insulator is measured by the picoammeter.

注意，顶部的电极接保护，所以只有流经绝缘体表面的电流才为皮安计所测量。

youdao

Note the top electrode is guarded, so that only current flowing across the insulator is measured by the picoammeter.

注意，顶部的电极接保护，所以只有流经绝缘体表面的电流才为皮安计所测量。

youdao