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.
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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