In modern measurement techniques, multi-channel measurement has become an increasingly important measurement technique . Now there are a lot of data measurements and acquisition systems.However, some of them lock of multifunction,enough collection, high sampling rate and simple operation and need specific test environment and so on.People need a wide range of applications, cost-effective data acquisition system. After analyzing the characteristics of different types of microcontroller and external chip performance, the system of multi-channel electrical acquisition system is designed。The design gives the system's hardware, software methods ,the system performance test and analysis. This paper analyzed the characteristics and performance of external chip with different types of microcontroller, designed multi-channel electrical parameters acquisition system based on the microprocessor technology, given the hardware and software method of system. The design of Multi-channel data acquisition system processed the sample signals, through the keyboard to control the collection of data and using AD converting into digital signals, then used single chip to store and process data, displayed collected data via four LED at last. The data acquisition system with a powerful data processing, intuitive display, user-friendly, and cost-effective, can be widely used in industrial control, instruments, meters, mechanical and electrical integration, intelligent home and many other fields.
Key words: data acquisition, multi-channel, MCU, AD conversion
