Today, I will introduce a national invention authorized patent-a handheld electric energy meter field calibrator. The patent was applied for by Haiyan Xingchuang Electronics Co., Ltd., and the authorization was announced on February 8, 2017.
Content descriptionThe utility model relates to the technical field of electric energy meter calibration, in particular to a handheld electric energy meter field calibrator.
Background of the inventionThe most basic functions of the electric energy meter on-site calibrator are the two functions of on-site calibration of electric energy meter errors and wiring check. The on-site calibration of electric energy meters has the advantages of not needing to disassemble the measuring appliances, without interrupting the measuring appliances, and can truly record the actual impact on the site. , It can also save manpower and material resources and improve work efficiency. When the user raises objections to measuring instruments such as electric energy meters, transformers, etc., on-site verification can be completed without affecting the use of electricity, and the correctness of the wiring can be checked. Therefore, on-site verification of electric energy measurement errors and on-site inspection of measurement errors have become indispensable tasks. In order to facilitate on-site operation, the on-site calibrator can use a current clamp meter to access the current without disconnecting the line.
The current electric energy meter field calibrator usually adopts complex AD sampling circuit, electric energy calculation circuit and sampling reference circuit to realize electrical signal sampling, and convert it into digital signal and electric energy error calculation. The internal reference of electric energy meter field calibrator is more complicated. , The production cost is relatively high, the volume is large, the weight is heavier, and the calculation accuracy is low, which has an impact on the processing speed of the single-chip microcomputer in the electric energy meter field calibrator. In order to solve the above problems, realize the lightness of the electric energy meter field calibrator. Quantification, cost reduction, and instrumental transformation of equipment, while simplifying the internal benchmark of measurement, improving the calculation accuracy and the accuracy of calibration, it is necessary to propose a handheld electric energy meter on-site calibrator.
Summary of the inventionThe purpose of the utility model is to overcome the above-mentioned shortcomings of the prior art, and provide a handheld electric energy meter field calibrator, which aims to solve the complicated internal reference of the electric energy meter field calibrator in the prior art, and the production cost is relatively high. , And the technical problems of large size, heavier weight and low calculation accuracy.
In order to achieve the above purpose, the present utility model proposes a handheld electric energy meter on-site calibrator, which includes a handheld shell, a micro-control unit MCU and a high-precision electric energy metering chip, the micro-control unit MCU and high-precision electric energy metering The chips are all installed inside the handheld shell, the micro-control unit MCU is provided with a key input interface, a liquid crystal display interface and a communication interface, and the high-precision energy metering chip communicates with the micro-control unit MCU through a bus Interface connection, the high-precision electric energy metering chip is provided with a current sampling interface and a voltage sampling interface, the hand-held housing is provided with a key operation interface and a display screen, and the key operation interface is connected to the micro-control unit MCU The key input interface on the computer is connected, and the display screen is connected to the liquid crystal display interface on the microcontroller MCU.
Preferably, a stabilized power supply circuit is also arranged inside the handheld housing, and the micro-control unit MCU, high-precision energy metering chip and display screen are all connected to the stabilized power supply circuit. During the verification, the current sampling interface on the high-precision electric energy measurement chip is connected to the current sampler, and the voltage sampling interface is connected to the voltage sampler. The current sampler adopts a current clamp meter, and the accuracy level of the current clamp meter is 0.1 or 0.05. The said micro control unit MCU adopts STM32 embedded ARM system. The display screen adopts a true-color LCD screen, and the display screen is used to display electrical parameters and test information. The size of the true color LCD screen is 3.2 inches.
The beneficial effects of the utility model: Compared with the prior art, the utility model provides a handheld electric energy meter on-site calibrator, which has a reasonable structure and adopts a high-precision electric energy metering chip as the internal reference of the handheld electric energy meter calibrator It replaces the complex AD sampling circuit, electric energy calculation circuit and sampling reference circuit of the original electric energy meter field calibrator, greatly simplifies the internal reference of measurement, and cooperates with the current clamp meter of level 0.1 or higher to realize The commercialization of the on-site calibrator for electric energy meters with level 0.2 accuracy has achieved lighter weight, lower cost, and tool-based transformation of equipment. At the same time, the STM32 embedded ARM system is adopted to realize a beautiful and simple man-machine. Dialogue operation.
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