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介绍了在线自动宽度测量仪的原理及硬件结构，给出了仪表步距常数的计算方法和有关的程序框图，分析了影响系统精度的主要因素及解决办法。
The principle and hardware structure of on-line automatic breadth measuring instrument are introduced. The calculation method of instrument step constant and the related block diagram are given. The main factors affecting system accuracy and the solutions are analyzed.