Digital type universal meter automatic calibration system

Abstract

The invention provides a digital type universal meter automatic calibration system. A calibration module controls a multifunctional calibration source to input corresponding A / DC voltage, A / DC current and resistance values to a detected digital type universal meter via an image acquisition device according to a gear range of the detected digital type universal meter. The image acquisition device acquires the measured data displayed by the digital type universal meter, then the measured data are inputted to the calibration module to be processed and error calculation and certificate generation are performed on the measured data. The measured data of the digital type universal meter can be automatically read, identified and led in so that artificial eye reading of the measured data of the universal meter is substituted and accuracy and working efficiency of calibration are enhanced.

Description

technical field [0001] The invention belongs to the technical field of electronic instruments and relates to an automatic calibration system, which can be used for automatic calibration of digital multimeters. Background technique [0002] The traditional digital multimeter semi-automatic calibration device mainly controls the multi-functional calibration source output standard signal to the multimeter through the computer, and manually reads the multimeter data and manually inputs it into the computer to realize the calibration function. This kind of calibration device has the following disadvantages: [0003] 1. Low efficiency: multimeters usually have multiple functions (AC, DC voltage, AC, DC current, and resistance, etc.), and each function includes multiple ranges. Manual verification and calibration require repeated wiring, switching functions, and switching ranges. [0004] 2. Error-prone: The semi-automatic calibration device needs human eyes to read the data, and m...

AI Technical Summary

Problems solved by technology

[0003] 1. Low efficiency: multimeters usually have multiple functions (AC, DC voltage, AC, DC current and resistance, etc.), each function includes multiple ranges, and manual verification and calibration require repeated wiring, switching functions, and switching ranges

[0004] 2. Error-prone: the semi-automatic calibration device needs human eyes to read the data, and manually input the data into the computer, there is a certain probability of wrong input and missing input data

[0005] 3. Poor consistency: During manual verification and calibration, due to the subjective consciousness of different verification personnel to judge whether the signal is stable or not and to select the appropriate measurement result data, the measurement consistency is poor

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