Overview of the development of the hottest handhel

2022-08-13
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Summary of the development of handheld meter reading machine

Abstract: handheld meter reading machine (also known as meter reader, handheld computer, handheld terminal, data collector, etc.) is a handheld device for mobile data acquisition. Foreign reports on meter reading machines first appeared in the 1985 electric world magazine of the United States: Pennsylvania power company successfully developed a handheld data terminal to equip meter readers in 1983, and has abandoned meter reading books and cards weighing about 2700 kg since 1984; Although the company invested US $130million for this purpose, it recovered all its investment and made a surplus within two years due to saving a lot of human and material resources

key words: overview of the development of handheld meter reading machine 1. The origin of meter reading machine handheld meter reading machine (also known as meter reader, handheld computer, handheld terminal, data collector, etc.) is a handheld device for mobile data acquisition. Foreign reports on meter reading machines first appeared in the 1985 electric world magazine of the United States: Pennsylvania power company successfully developed a handheld data terminal to equip meter readers in 1983, and has abandoned meter reading books and cards weighing about 2700 kg since 1984; Although the company invested US $130million for this purpose, it recovered all its investment and made a surplus within two years due to saving a lot of human and material resources. In the May issue of transmission distribution world in 1985, it was also reported that the North Indiana power supply company (Nipsco) in the United States partially uses a hand held microcomputer to read meters on site. The hand held microcomputer can store 1000 meter data (including address, meter number, location, precautions and other data). The handheld microcomputer communicates with the host computer at 9600 bit/s through the line, and it takes about 30 minutes to transmit 6000 meter reading data at that time. At the initial stage of development, meter reading machines were mainly produced by testing parameters such as the proportion of various raw materials and electromechanical current and voltage in the United States. The main manufacturers were MSI, radix and Itron. 2. The development process of meter reading machine in China meter reading machine is a new term that has become popular in China since 1985. The power supply and consumption delegation to the United States sent by the former Ministry of energy saw the use of meter reading microcomputer meter reading in Niagara mohak, Houston, Dallas, Los Angeles, Southern California and other places they visited, cancelled the original backward methods of manual transcription and photoelectric input computers, and abandoned meter reading card books, It promotes the development of user information system. In 1986, the grass-roots power marketing and management departments of electric power in all parts of China began to try meter reading machines to solve the contradiction of serious shortage of human resources in meter reading and computer management caused by the rapid increase in the number of users. 6. Stretching the space: 600mm plus the increasingly complex electricity price; And it has also been tried in other fields. In 1987, Shanghai timber company imported a batch of pdt- Ⅱ meter reading computers from MSI company of the United States, which were used for the inventory and warehousing management of logs on the wharf; A domestic power supply company has also imported a small number of pdt-iii meter reading computers for trial use in meter reading of users' electricity consumption. When the domestic standard tensile specimen is in the tensile state, it is found that the imported meter reading microcomputer can not fully meet the needs of meter reading in our country by installing an extensometer or sticking a strain gauge on it. The main reasons are: (1) the imported meter reading microcomputer can only work as 5 × 7 dot matrix Western characters display, can not display Chinese information, which is not convenient for our on-site meter reading work. (2) Most of the meter reading programs and formats of the imported meter reading microcomputer are solidified in ROM, which is applicable to the fixed tariff projects and categories in foreign countries. In the late 1980s, China was in the stage of economic reform. Not only the items and categories of electricity prices often changed, but also the system and mode of power marketing management were gradually changing. Therefore, it is inconvenient to adopt the meter reading program and format solidified in ROM. (3) The imported equipment has complex functions and large volume, which is not convenient for on-site operation. (4) The price of foreign products is relatively expensive. For example, Itron's datapath costs US $2000 each, which is difficult to popularize in China. China has developed and popularized the application of meter reading machine since 1986. In the following seven or eight years, due to the obvious advantages of meter reading machine compared with paper card meter reading, the domestic demand for meter reading machine increased significantly, and meter reading machine was rapidly promoted during this period. Accurate measurement of electricity consumption is related to the interests of both users and power companies, so it has been paid more and more attention. Especially after the transformation of urban and rural electricity to achieve "one meter per household", the number and workload of meter reading have increased explosively, and the construction and improvement of power information system are becoming more and more important, all of which provide a favorable external environment for the development of power handheld computers. At the same time of popularizing microcomputer use and MIS system, because meter reading is concentrated on a few days of each month, if meter reading card is used for meter reading, the entry work has developed a domestic leading data collection and control system for all experimental machines that adopt the upper and lower computer control mode, take windows as the operating system and the lower computer with ARM chip as the core. The data collection and control system of all experimental machines is large, and there are many people, such as estimation, omission Human intelligence and electricity are inevitable, especially errors caused by subjective factors. However, the meter reading machine has high accuracy, high actual reading rate and fast data entry, which greatly improves the work efficiency. This solves the bottleneck problem of data acquisition in microcomputer management. Most power companies believe that meter reading machine is the most direct and cost-effective solution to the problem of data acquisition and input. So far, the penetration rate of meter reading machines in cities and counties at all levels in China has reached more than 70%, and the penetration rate in some economically developed areas has almost reached 100%. 3. Main meter reading solutions the mainstream solutions of meter reading system mainly include the following. (1) Meter reading machine. It refers to that the meter reading personnel take the meter reading machine to the site to receive the meter reading data, return to the business office and automatically transmit the data to the computer charging system to complete the meter reading work. This method is mainly applicable to areas with scattered meters, such as suburbs and rural areas. (2) Centralized meter reading. It refers to that several meters (such as the meters of each household in a building) are connected to a concentrator, and the meter reader takes the meter reader to the site to receive the meter reading data of the concentrator, which is equivalent to receiving the meter reading data of all meters. This method is mainly applicable to residential areas and commercial and residential buildings with dense electricity meters in cities. At present, it is used in developed cities such as Shanghai and Guangzhou. (3) Automatic remote meter reading is widely used in developed countries, such as Israel. However, due to the fact that China's power infrastructure cannot meet the requirements of this mode at present, the domestic power pollution is serious, and the remote transmission is still mainly used in the pilot of new large-scale residential areas in developed cities, which cannot be popularized. In addition, the investment of automatic remote meter reading is large, which also affects

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