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由于微电子技术迅猛发展,微计算机技术日趋成熟。单片微计算机的出现使得二次仪表向着多功能、微型化、性能好、价格低方向发展。本文介绍的是采用单片微计算机的智能化二次仪表。一、工作原理及功能简介该仪表以MCS-48系列单片机8748为核心,采用高分辩率、高精度4(1/2)位A/D转换芯片7135,加上少量逻辑部件组成,且配有微型打印机。被检测量经传感器变换成模拟电压,进入仪表后,经过A/D转换,变为数字量,
Due to the rapid development of microelectronics, micro-computer technology matures. The emergence of single-chip microcomputer makes secondary instrument toward multi-function, miniaturization, good performance, low price direction. This article describes the use of single-chip microcomputer intelligent secondary instrument. First, the working principle and function profile The instrument to MCS-48 series microcontroller 8748 as the core, using high resolution, high precision 4 (1/2) bit A / D converter chip 7135, plus a small amount of logic components, Miniature printer. Measured by the sensor into analog voltage, into the instrument, after A / D conversion, into a digital,