基于ISA总线的数据采集卡的设计及应用

本文介绍了基于ISA总线的数据采集卡的硬件电路和软件设计。针对传统数据采集卡中电压测量电路的零点校正和满刻度校正是用滑动变阻器来实现的,设计了一种新的采用D/A转换芯片、存储器和集成运算放大器的电路,代替了传统的滑动变阻器校正方法,实现了自动校正,提高了调整精度。采用新的校正电路的另一个优点是可以采用各种非线性校准技术,对电压测量电路的非线性进行自动校准。

Design and application of the data acquisition card based on ISA bus

This paper presents the hardware circuit and software design of data acquisition card based on ISA bus.Using the D/A convert chip,memorizer and integrated OP,the new circuit is designed instead of the traditional emendation with slip rheostat.The result shows that this design can achieve the auto-emendation with high precision,and auto-calibrate the nonlinear with calibration of nonlinear technology in the voltage measurement circuit.