一、前言在微处理机广泛普及的今天,几乎所有的企业都进行了改革。诸如办公自动化(OA)、个人计算机、微型计算机等等,装有μ—CPU的产品到处可见。同样,在仪表测量领域,随着单片μ—CPU的发展,分散型DDC也在急速地发展。现在,以单回路调节器为主的数字式调节器正在定型,将危险分散而且已经卓见成效。随着仪表的发展,对其维护方面的技术当 I. Preface Microprocessors are widely used today, and almost all enterprises have carried out reforms. Products such as office automation (OA), personal computers, microcomputers, etc., with μ-CPUs are everywhere. Similarly, in the field of instrumentation, with the development of single-chip μ-CPU, distributed DDC is also rapidly developing. Digital regulators dominated by single-loop regulators are now being finalized, putting the danger in jeopardy and having achieved great results. With the development of instruments, the technical aspects of its maintenance