一、引 言 目前国内数显机床标尺大部分为光栅、磁栅和感应同步器。这些装置各有所长,但成本较高,结构复杂,对使用环境有一定要求,大面积推广存在困难。容栅式数显机床标尺具有测量速度快、能耗低、结构简单,对使用环境要求不高等优点,因此越来越引起人们的重视。近年来,国内有关单位开发了读数值为0.01mm的容栅式数显机床标尺。它是以容栅式数显卡尺数显装置为基础,利用单片机为核心的接口电路,对其输出的串行信号解码、处理和显示。利用微处器可实现误差修正,提高 I. INTRODUCTION At present, most of the domestic digital display machine tools are grating, magnetic grid and induction synchronizer. These devices have their own strengths, but the higher cost, complex structure, the use of the environment have certain requirements, large-scale promotion difficulties. Capacitor grid digital display machine tool with measuring speed, low energy consumption, simple structure, the use of the environment does not require the advantages of high, so more and more aroused people’s attention. In recent years, the relevant units in our country have developed the capacitance-type digital display machine tool scale with reading value of 0.01mm. It is based on capacitive digital caliper digital display device, the use of SCM as the core interface circuit, the serial signal output decoding, processing and display. Using the microprocessor can be error correction, improve