数据采集系统的可测性研究

Study on Testable Design for Data Acquisition System

数据采集系统是测控仪器的核心部分，要提高系统的可用度和可靠度，检测和诊断是其重要环节。文章在分析典型数据采集系统结构的基础上，研究了实现输出控制接口测试、数据采集回路的闭环自测试设计方法，提出冗余设计是实现数据采集模块自测试与自诊断的主要方法与技术。针对典型数据采集系统所存在的不可靠、速度低以及通道之间不能进行瞬时比较等缺点，给出了并行多通道数据采集系统的实现技术并利用此技术进行道间校正、测试和容错设计。利用自测试与自诊断技术，提高了实际应用系统的可靠性。

Data acquisition system (DAS) is the key part of a measurement and control instrument.To improve the reliability and availabitity, the system test and diagnosis are important measures. Based on the analysis of a typical DAS structure. this paper studies on the design implementation of the testing for output control interfacing and the self - testing for a DAS closedloop. Fault - tolerant design is the main method and technique for implementing the self - testing and self - diagnosing of data acquisition module. To counter the backwards of nonreliabitity,low speed and non comparison between channels in a typical DAS, the implementntation of parallel multichannel DAS is presented in this paper , the channel correcting, testing and fault tolerant designing are carried with it by use of the self - testing and self - diagnosing techniques,the practical system reliability is improved.