The utility model provides a portable recorder. The portable recorder comprises a voltage adjusting module, an NI acquisition module, a data processing unit and a communication module which are connected in sequence, the voltage regulation module is used for connecting an external voltage signal and performing range regulation; the NI acquisition module is used for acquiring the voltage signal after range adjustment and uploading the acquired voltage signal; and the data processing unit is used for receiving the uploaded voltage signal, processing the voltage signal and uploading the processedvoltage signal to an upper computer through the communication module. According to the technical scheme of the utility model, the open-type testing system is designed. A user can configure the recorder by himself/herself according to the requirements of measurement tasks, signal acquisition, analysis and processing of various devices are achieved, the measurement requirements of high range, highprecision and multiple channels are met, and meanwhile the recorder has the advantages of being small, exquisite, portable, wide in application range and the like, and can meet the complex test environment of an industrial field.