Database;  portable systems;  data collection;  Signal analysis

A portable computer based on self-developed board and a universal data acquisition and signal analysis system based on Paradox database developed by C++ Builder are designed, with keyed phase channel, displacement channel and acceleration channel, which can be used for free acquisition, synchronous full-cycle acquisition and analysis of steady-state and transient signals of rotating machinery and reciprocating machinery. The selection and design of database were discussed, a fast query mode was established, and finally the data collection and management function based on relational database was realized. Experimental results show that it is stable and reliable in industrial sites and easy to upgrade and expand.