3SK1121-1AB40電導率的測量原理是將相互平行且距離是固定值L的兩塊極板（或圓柱電極），放到被測溶液中，在極板的兩端加上一定的電勢（為了避免溶液電解，通常為正弦波電壓，頻率1～3kHz）。然后通過電導儀測量極板間電導。
電導率的測量需要兩方面信息。一個是溶液的電導G，另一個是溶液的電導池常數Q。電導可以通過電流、電壓的測量得到。

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