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Electronic weighing basic knowledge
作者:管理员    发布于:2019-07-08 09:36:23    文字:【】【】【】浏览 (1170)
Chapter 1 Introduction
First, the concept and origin of weighing
(A) Weights and Measures (Qin Dynasty)
(B) the concept of weighing
1, in the past used to measure various objects in the outdoor mass or weight of the apparatus or device referred to as weighing machine.
2, with the measurement technology, OIML (International Organization of Legal Metrology) 1992 Definition: the use of gravity acting on the object to determine the quality of the object is called measuring instruments.
3, China's national standard GB/T14250-93 of scales is defined as: the use of gravity acting on various objects weighing principle, determine the quality or as a function of the other ranges of quality, value, parameters or characteristics named as measuring instrument.

Second, the weighing application, development and prospects
(A) Weighing applications: industrial, agricultural, commercial, health, foreign trade, transportation, defense, and scientific research.
(B) Development and Prospects of weighing:
1, mechanical lever scales (before 1950) with the need for rapid weighing device automation: electronic weighing
2, four stages development of electronic weighing:
① The first stage: 50 to 60 years for the mechanical lever-type weighing scales designed to printer;
② The second stage: early 1970s-80 years, sensors, weighing display technologies appear, and any real sense of the electronic scale;
③ The third stage: in the 1980s began, 3C technology infiltration (computer, control, comminication), appear intelligent electronic scales, used in various production sites, participate in data processing, information exchange and on-site control;
④ The fourth stage: turn of the century, the introduction of digital technology, digital sensor appeared, with its high accuracy, abundant anti-jamming performance, ease of use and rapid fault diagnosis and adjustment to create another one world.

Third, the measuring principle:
(A) leverage;
(B) the elastic element deformation theory.
 
Chapter II, the quality metrology systems and scales classification
First, the quality measurement: quality is the world's most basic, most important, the most common physical quantities. It is one of seven basic units in international system of units : "kg" / kg
Second, the quality measurement concepts: using measuring instruments (such as balance and scales), with a certain measure, to find the quality of the measured object in the specified accuracy range, and the quality of the International Prototype kilogram corresponding value of the strict in a series of experiments.
Third, the quality measuring instruments:
Measuring the quality of measurement ---- weight, by mound
Quality measuring instruments ---- balance, scale

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