屏蔽对与屏蔽对具有较好的绝缘性能，电缆在使用中若屏蔽对屏蔽对之间出现电位差时，不会影响信号的传输质量。
Shield with the shield has good insulation properties of the cable in use of the shield, if shield potential difference between the right, it will not affect the signal transmission quality.
在目前电场计算的文献中，限于计算电位参考点和各带电体间的电位差均为已知时的带电系统中的电场分布。
In current literatures methods of electric field calculations are only applicable to the case, where the potential differences between charged objects and the potential reference point are known.
时间城激电对电位差的相对精度要求不高，但供电电流大，装备笨重。变频法对电位差的相对精度提出了很高的要求，在极化率低时，难于达到。
The time domain IP does not require very high relative precision of potential difference, but the supply current is large and the equipment is cumbersome.
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