Method for automatically judging calibration time of sensor

Abstract

The invention discloses a method for determining calibration time of a sensor in test equipment. The method is designed according to calibration requirements of the test equipment, can monitor accuracy change condition of the sensor, judges the stability of the sensor, gives optimal calibration time in time, realizes self-calibration of the sensor, ensures test accuracy in a certain range, avoidsexcessively frequent calibration operation, improves utilization ratio of the equipment and saves calibration cost. The used method realizes in situ self-calibration of the sensor and judges the calibration time through a simple self-calibration process by using a standard substance according to an output characteristic design and a characteristic curve of the sensor. The method has simple algorithm and is convenient to realize in software of the test equipment.

Description

【Technical field】 [0001] The present invention relates to self-calibration of sensors in test equipment and methods of determining when to calibrate sensors. 【Background technique】 [0002] At present, some sensors are more or less used in various automatic test equipment. A sensor is a detection device that can feel the measured information, and can convert the detected information into electrical signals or other required forms of information output according to certain rules, so as to meet the needs of information transmission, processing, storage, display, recording and control requirements. It is the first link to realize automatic detection and automatic control. The measured values ​​of the sensors in most of the test equipment are directly used to judge the test results, and a certain degree of stability needs to be maintained for the accuracy and performance of the sensors. [0003] Generally, according to the requirements of measurement standards, the key compon...

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Problems solved by technology

However, it is impossible to judge the change of its accuracy during the use process. If the simple periodic calibration is performed according to the recommended cycle of the equipment, either the time is too short or the cycle is too long. If it is too short, it will not only waste money, but also reduce the utilization rate of the test equipment. If the period is too long, it will affect the measurement results;

[0005] 2) The current test equipment has a relatively high degree of integration, and the sensor must be removed and sent to the school every time it is calibrated. Non-professional operations can easily cause man-made damage;

[0006] 3) Most sensors need to be adjusted precisely. Calibration is generally carried out in a relatively independent environment. After the calibration is completed and installed on the equipment, the sensor signal is often interfered by the electrical signal of the equipment itself, which will cause some simple sensor calibration to be unable to solve the problem. error;

[0007] 4) The calibration time is determined according to the use experience, and there is a lack of objective data basis. For example, the accuracy cannot be guaranteed by manual records of the frequency of use, and statistics are inconvenient. The specific accuracy error of the sensor cannot be easily measured and confirmed, etc.

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