ZHENG Yong-qiu（郑永秋）1,2, REN Yong-feng（任勇峰）1, LIU Xin（刘鑫）1,3, CHU Cheng-qun（储成群）1
(1. Science and Technology on Electronic Test & Measurement Laboratory, University of China, Taiyuan 030051, China;2. Key Laboratory of Instrumentation Science & Dynamic Measurement (North University of China) , Ministry of Education, Taiyuan 030051, China;3. College of Electronics and Information Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China)
Abstract: This paper describes the detailed design of data acquisition device with multi-channel and high-precision for aerospace. Based on detailed analysis of the advantages and disadvantages of two common acquisition circuits, the design factors of acquisition device focus on accuracy, sampling rate, hardware overhead and design space. The mechanical structure of the system is divided into different card layers according to different functions and the structure has the characteristics of high reliability, convenience to install and scalability. To ensure reliable operation mode, the interface uses the optocoupler isolated from the external circuit. The transmission of signal is decided by the current in the current loop that consists of optocouplers between acquisition device and test bench. In multi-channel switching circuit, by establishing analog multiplexer model, the selection principles of circuit modes are given.
Key words： data acquisition; multi-channel; high-precision; analog multiplexer; field-programmable gate array（FPGA）
CLD number： TP274+.2 Document code： A
Article ID： 1674-8042(2013)02-0184-06 doi： 10.3969/j.issn.1674-8042.2013.02.020
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