这一结构被夹在由导电材料制成的具有电极作用的内环和外环之间，整个结构的外围是又一层聚碳酸酯外壳。
This is sandwiched between inner and outer rings of conducting material that act like electrodes, and the whole thing is surrounded by yet another layer of polycarbonate as cladding.
试验探棒还需穿过在表面覆盖一层非导电涂层如瓷釉或清漆的接地金属外壳的开口。
The test probe is also applied through openings in earthed metal enclosures having a nonconductive coating such as enamel or lacquer.
当测试表面无导电材料的被测件如塑料外壳时，该检测功能可关闭掉。
The detection feature can be switched off when testing EUT's with non-conductive surfaces, such as plastic housings.
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