This paper introduces definition, construction and principle, advantages and shortages of three historical periods: analogic oscilloscope, digital memory scope and digital fluorescence scope.

This paper analyzed the diagnosis principle about the induction motor, developed a fault diagnosis system based on the DSO-2100 hypothesized digital oscilloscope.

On the basis of the analysis of DSO's fundamental principle, the design and implementation of a kind of portable digital storage oscilloscope system was discussed in detailed in the dissertation.