With the development of electronic technology, digital oscilloscope with digital technology and software has greatly expanded the ability to work, the sampling rate is low, the early products of the dead time, the screen refresh rate low is greatly improved, previously difficult to observe the modulation signal, communication eye diagram, video signal composite signal more easily observed. The digital oscilloscope can be calculated and analyzed the data, especially for all the details to capture the complex dynamic signal generated and the abnormal phenomenon, so it has been widely used in scientific research, industrial production. In order to make the digital oscilloscope work in a qualified state, it is an urgent task for the test engineer to carry out periodic, rapid and comprehensive examination of the oscilloscope to ensure the traceability of the value.