Calibration method, system and device of pointer instrument

Abstract

The invention relates to a pointer type instrument calibration method comprising the steps that numerical reading measurement of a specified scale line is performed on a standard pointer type instrument so that a correspondence table of accurate numerical reading when the pointer of the standard pointer type instrument points to the specified scale line and numerical reading pointed by the pointer on the image of the standard instrument is generated; a metering reference source is controlled to drive the pointer of the measured pointer type instrument to point to the specified scale line, and the corresponding output value of the metering reference source is acquired; the image of the measured instrument is acquired at the designated position, and numerical reading pointed by the pointer on the image of the measured instrument is acquired according to the image of the measured instrument; the correspondence table is viewed, and accurate numerical reading corresponding to numerical reading pointed by the pointer on the image of the measured instrument is acquired and acts as the actual numerical reading of the measured pointer type instrument; whether the difference value of the actual numerical reading and the scale value corresponding to the output value of the metering reference source is within the preset range of difference value is judged; and if the judgment result is yes, the measured pointer type instrument meets the calibration standard through judgment. Calibration accuracy is enhanced by the pointer type instrument calibration method.

Description

technical field [0001] The invention relates to the field of measuring instruments, in particular to a calibration method, system and device for a pointer instrument. Background technique [0002] The pointer instrument is a kind of indicating instrument, and the value of the corresponding range can be obtained by reading the position of the scale line indicated by the pointer. Examples are pointer voltmeters and pointer ammeters. Due to mechanical failure or long-term use of the pointer meter, there may be deviations in the pointer indication of the meter, resulting in inaccurate readings. Therefore, in order to ensure that the pointer meter obtains more accurate data, it is usually necessary to regularly verify the pointer meter. [0003] At present, the verification work of commonly used pointer instruments is to take the image of the pointer instrument through the camera, read the value pointed by the pointer in the image through image recognition, and compare whether ...

AI Technical Summary

Problems solved by technology

For example, when the angle taken by the camera is not directly at the current pointer position, the reading will not be accurate, and the result of the test will also be inaccurate

Therefore, in general, the existing verification methods for identifying pointer instruments are not very accurate.

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