The theory of passive intermodulation generation on printed transmission lines has been proposed. The new model for a terminated section of the transmission line with distributed nonlinear resistance has been developed and verified against the

自动量程切换换电导率仪，用于环保水处理对于水质的电导率。电阻率在线自动测量。-Automatic range switching for electrical conductivity meter, used for environmental water treatment for water conductivity. Line automatic measurement of resistivity.