国外数显应用十分普遍。在美国,五十年代初期发明感应同步器以来,逐步发展为专供测量的数显装置。六十年代末期,美国提出数显革命,大量采用各种数显改造旧机床,平均提高效率20％以上,在新机床方面(包括一般机床和精密机床)也采用了数显装置配套。七十年代以后,国外光栅发展迅速,应用范围越来越广。磁尺自七十年代投入市场以来,也在不断发展。据国外考察报告介绍,日本有的具有五十年历史的老厂,数显机床占现 Foreign digital applications are very common. In the United States, since the invention of the inductive synchronizer in the early 1950s, it has gradually evolved into a digital display device for measurement. At the end of the 1960s, the United States proposed a digital revolution, using a large number of digital displays to reconstruct old machine tools, increasing the average efficiency by more than 20%. In the new machine tools (including general machine tools and precision machine tools), digital display devices were also used. Since the 1970s, foreign rasters have developed rapidly and have become more widely used. Since the magnetic tape was put into the market in the 1970s, it has also continued to develop. According to a foreign inspection report, some old factories in Japan with a history of 50 years are represented by digital display machines.