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At present, the spacecraft's electric initiating explosive devices areSdetonated by the pulse-width signal, and generally multiple points areSdetonated at the same time. As a result, the numberSofSchannelsSis high and theSwidthSofStheStransient signalsSisSverySnarrow. To solve the problem of accurately detecting the times and width of the sequence instructions for each of the electro-explosive channels, an equivalent equipment is designed and realized. It consists of industry control computer based onSPXISbus architecture, general interface boards, appropriative boards and the backup data browsing terminal, which has the advantages of high reliability, general compatibility, and good maintainability. It has been applied in the YZ-3 upper stage task, which strongly supports automationSofSaerospace vehicle testing and launching inStheSstateSof the whole spacecraft.