A novel liquid conductivity measurement method based on the principle of bridge balance is pro-posed.The accuracy of conductivity measurement is affected by inherent capacitance and spontaneous electromotive force of liquid,which are encountered in conventional testing processes.To mitigate the interference caused by ca-pacitance,high-frequency alternating current is employed instead of direct current.Additionally,an oscilloscope is used as a replacement for a galvanometer optimizes the criteria for bridge balance determination.Specifically,the oscilloscope indicates a non-zero linear signal as the reference for bridge balance.Based on this method,it is ob-served that the concentration of sodium sulfate solution exhibits a linear relationship with its conductivity.The rela-tive uncertainty can be reduced to as low as 1.8％.This finding can be successfully applied in blind predictions of unknown solution concentrations and simulated rainfall amounts.
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