A design ot portable digital oscillograph based on dsp is presented . a integrated prototype is composed of high speed data processing module by which signal is digitalized , data processing unit whose core is dsp , general controller as which cpld is used and terminal facility - - lcd 通过高速数据采集模块将信号数字化,以高性能数字信号处理器tms320vc5402为核心构成数据处理单元,采用高密度的可编程逻辑器件epf6016a设计仪器的系统控制单元,使用液晶显示器做为终端显示设备,构成一个完整的示波表样机。