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Automatic calibration device for digital multimeter

A multimeter and digital technology, applied in the field of automatic calibration devices of digital multimeters, can solve the problems of large amount of error calculation, low work efficiency, error-prone counting and the like

Inactive Publication Date: 2021-02-26
BEIJING ZHENXING METROLOGY & TEST INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides an automatic calibration device for a digital multimeter, which can solve the technical problems in the prior art such as large amount of error calculation, error-prone counting and low work efficiency.

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  • Automatic calibration device for digital multimeter

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Embodiment Construction

[0026] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0027] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit t...

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Abstract

The invention relates to the technical field of electrical metering, and discloses an automatic calibration device for a digital universal meter. The device comprises a controller, a calibration source, a switching unit and an image acquisition unit, wherein the controller is used for outputting a first instruction for controlling the calibration source to generate a standard signal and a second instruction for controlling the switching unit to switch between different paths of the digital multimeter; the calibration source is used for generating a corresponding standard signal according to the first instruction; the switching unit is used for switching to the corresponding path according to the second instruction and transmitting the standard signal generated by the calibration source tothe switched path so as to enable the digital multimeter to execute measurement; the image acquisition unit is connected with the controller and is used for acquiring a reading image of the digital multimeter and outputting the reading image to the controller; and the controller is also used for identifying the reading image to obtain the reading of the digital multimeter, calculating an error according to the obtained reading, and judging whether the digital multimeter is out of tolerance or not according to the calculated error. Therefore, full-automatic calibration of the digital multimetercan be realized.

Description

technical field [0001] The invention relates to the technical field of electrical measurement, in particular to an automatic calibration device for a digital multimeter. Background technique [0002] Due to its low price and simple use, the digital multimeter has been widely used in various fields of scientific research and production. In order to ensure accurate and reliable value transfer, digital multimeters must be calibrated regularly according to national and industry regulations. [0003] In the daily electrical measurement and calibration work, multimeters (handheld digital multimeters) are the most numerous category. For a single multimeter, it generally has DC voltage, AC voltage, DC current, AC current, resistance measurement functions, and some models also have frequency, capacitance and other measurement functions. Each function of the multimeter contains multiple ranges, and each range has multiple calibration points, and the technical indicators of each rang...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/00
CPCG01R35/005
Inventor 何慧李宗昆杨水旺
Owner BEIJING ZHENXING METROLOGY & TEST INST
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