Abstract With the development of the economy and culture, the presswork had been the necessity to the people .it can not be substituted in civilization- spread, news-reported, advertisement of product and so on. so it is important to improve the quality of the presswork .as the main materials of presswork, the capability of the paper determine the quality of the paper directly the smoothness degree of the paper is a very important factor to judge the concave and protrude of the paper .and it is also a physical factor show smooth, velvet and uniformity of the paper surface .the more smooth the paper is ,the more smooth and the integrity when the paper and the forme touch., and the printing ink will displace more fill in the forme or the mackintosh and the presswork will also be better .so how to evaluate the smooth of the paper has been very important . The paper smooth analyzer is a production of organic combination of micro-computer and instrument by bekk .this analyzer is in core of AT89C51 and meet other chips and pressure sensor. it includes more function modules, which work under control of AT89C51 single chip machine .each module mainly make contact with CPU in order to reduce the complexity of the system .the analyzer adopts module construction to expand function. This paper smooth analyzer suits the demand of modern production and test .Compared to the tradition analogy analyzer its main characteristic is more exactness, more swift, more light, convenient to operate and vindicate. so it will achieve the work of product and test better.
Key words: bekk smooth of paper pressure sensor AT89C51 single-phase AC electromotor
