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| | In recent years owing to the development of microprocessor technology, the small size SPC (Stored Program Control) electronic switching system has been widely used.In 1979 a characteristic model machine of 100 line SPC picturephone exchange was developed in Beijing Institute of Posts and Telecommunications. The structure of its hardware and software are all rather simple. It is mainly used as a teaching model.This paper describes the program structure of this exchange, putting emphasis on the project charac... | | 近期,由于微处理机技术的发展,使小型程控交换机得到了广泛的应用。北京邮电学院于1979年研制成了100门程控电视电话交换机的性能样机,该机的硬件和软件结构都比较简单,主要作为教学模型用。本文介绍该交换机的程序结构,重点是呼叫处理程序的方案特点和基本结构,并提供了大部分呼叫处理程序的流程图,可供希望了解程控交换软件基本技术的同志参考。 | | 文摘来源 | | Magnetic suspension spinning rotor vacuum gauge (MSRG) is a new vacuum gauge with high accuracy. The microprocessor technology is used in this gauge. Principles of operation and designs of the construction and electriccircuits are presented for Model CXG--1 MSRG. The real-time pressure measure-ment method made use of the TP-801 digital system is described. The methodsand results of the instrument performance test are described.The instrument performance index as follows: 1. Measuring range 7.5 ×10~(-7) to 1... | | 磁悬浮转子真空计是一种采用微处理机技术的新型高精度真空计。本文介绍了CXG-1型磁悬浮转子真空计的工作原理、结构和电路设计,以及用Z-80单板机完成实时压强测量的方法。简述仪器性能测试的方法与结果。该仪器用于真空标准比对的传递规和真空量值传递的副标准规,也为高精度真空测量与控制提供了一种重要手段。 | | 文摘来源 | | Many microprocessor-based flow meters with temperature and pressure corrections can only be applied to the measurements of a certain orifice or fluid. This paper gives out several new correcting methods adequate to almost any type of orifice and compressible fluid. | | 采用微处理机技术的温压校正式流量仪表已获得了广泛的应用,但不少这类仪表只能面向某一种被测介质及节流装置,缺乏良好的通用性。本文从仪表的通用性着眼,介绍几种新的校正方法。 | | 文摘来源 | |   | | << 更多相关文摘 |
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