In this paper, a method based on the ration of migration time aided by the sudden change in electric current (RM ASCC) is introduced for improving the reproducibility of separation results.

The current signals with splash or without splash are processed using cepstrum transform in spot welding,and then the plots of the cepstrum are compared.

Based different dealing ways of voltage and current signals in Siemens analog input modular EM231,two normal signal-proceeding programs are given after the analysis of modular inner proceed procedure in this paper.

This paper introduces that current signals of power system are acquired by Rogowski coil through optical fiber transmission system to low voltage side,which overcome the strong electromagnetic interference between the high-voltage signals,finaly transmission signals are send into the MSP430 to achieve signal measurement and display to improve the accuracy of measurement.

There is almost no potential jump when determinating the acid number of used lubricating oil with the standards methods of GB/T7304 for petroleum products,it needs to use the toxic non-aqueous standard buffer solution for end point.