Abstract: As the “eyes of electronic engineers”， oscilloscope is one of the most commonly used measuring instruments in engineering field. Portable oscilloscope overcomes the disadvantages of large volume and high power consumption of traditional digital oscilloscope. Under the condition of retaining the basic functions of traditional digital oscilloscope， it makes the oscilloscope small and portable， especially suitable for outdoor and the environment with strict requirements on the volume of measuring instruments.This paper designs a portable dual channel digital oscilloscope based on the basic principle of oscilloscope， with FPGA as the core control and combined with the related technology of IOT. The whole design is divided into four modules: MCU main control module， signal sampling module， display module and remote control module. The oscilloscope designed in this paper can accurately measure the signals with frequency range of 0.1 Hz~2 MHz and amplitude range of -5 V~5 V， and can send the data back to the mobile terminal in real time. The test results show that all indicators of the oscilloscope meet the requirements and achieve the expected goal.

Key words: 便携式数字示波器, FPGA, TFT屏幕显示