In this paper , as an experimental unit we complete the betterment of experimental equipment of the hall experiment and design the data acquisition system of hall experiment by combining physical experiment with computer and intelligent instrument techniques 本文以霍尔实验为试点进行了实验器材的改造，将计算机技术、智能仪表技术与物理实验教学相结合，设计了霍尔实验数据采集系统。
We use fieldbus technique controlling the boiler ' s running , instead of ddc and dcs controlling system . considering most boilers in our country were still using the normal analogy instrument and the whole digit intelligence appliance were not popularity 现场总线技术要求现场的设备传送数字信号，需要使用智能仪表，但当前我国大部分锅炉还是采用常规模拟仪表，全数字化智能仪表还未普及。
The working principle and main functions of the intelligent greenhouses with distributed control system in the paper are introduced , this system uses pc as a host computer and intelligent instruments with mcs - 51 single - chip microcomputers as secondary computer systems 本文内容介绍了以pc机为上位计算机， mcs - 51单片机为核心的智能仪表为下位机的智能温室分布式测控系统的工作原理及主要功能。
Meanwile , software methods - software traps , software watchdogs , digital filter intensify the anti - interference . v / f switch smooths change of signals , which avoids data fluctuation and benefits anti - interference , the visual basic is selected as developed platform 此外，文中对智能仪表与pc机的通信作了详细的设计，其中包括主机与d硕士学住论文waiaster ’ stiiesis各节点的通信规约，详细的软件设计框图。
This laboratory device totally adopts industrial components such as sensors , instruments , which can be controlled by the intelligent instruments and fieldbus . it can also use fix configuration software to realize controlling in real time by pc 本实验台完全采用工业生产中实际使用的传感器、仪表、执行器等工业级元件，可以利用智能仪表和现场总线进行控制，亦可利用上位pc机，结合fix工控组态软件，实现实时监控。
Then in the early nineties of 20 century , in order to possess their own manufacturing property right of actuator they united one another to develop new intellective actuators . but limited by temporal behindhand computer technique , the developing achievement did not get real practical use 九十年代初，为了拥有具有自主知识产权的生产技术，组织了智能仪表的全国联合设计，但由于计算机工业的局限，使其成果未能真正实现应用。
