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在测量技术中,经常会遇到一些非电量的测量可以转换为对应于被检测量是线性函数的电阻量的测量.本文根据研制“数字温度自动巡回检测仪”的体会,介绍用这种线性电阻做测量元件,称为“数字电桥”的模—数转换器的原理和设计方法.和其它模—数转换器比较,这种转换器具有线路简单、制作和调试方便,抗干扰能力强、精度亦颇为令人满意等优点.
In the measurement technology, we often encounter some non-power measurement can be converted to correspond to the measured volume is a linear function of the resistance measurement.In this paper, based on the development of “digital temperature automatic tour detector” experience introduced with this linear Resistance as a measuring element, called “digital bridge” analog-digital converter principle and design method.Compared with other analog-digital converters, this converter has the advantages of simple circuit, easy manufacture and debugging, strong anti-interference ability , The accuracy is also quite satisfactory and so on.