"We have an instrument that was calibrated six months ago, and it has not expired, and suddenly it is out of date. What should I do about it?" The problem mentioned by the customer is actually quite common, but it should be paid attention to, especially in some industries involving personal safety and health. For this problem, Xiaobian will give you an explanation from two aspects of the causes and coping strategies. The main reasons for the misalignment are as follows: 1, improper use and operation as we all know, with the continuous development of science and technology, the precision of the measuring instruments we use is becoming more and more accurate, the more precise the instruments are, the more easily damaged they are. Technical personnel in the use and operation of the wrong method, it may lead to measuring instruments misalignment; When the metrology personnel calibrate the instrument, if the experience is not enough, it is possible to make the instrument inaccurate.

2, in the transportation and storage of damaged measuring instruments as high-precision instruments, high requirements for environmental factors, including temperature, humidity, pH, light and so on have requirements, if the environmental factors in less than the requirements of the instrument, for a long time, there will be misalignment. In addition, if the road condition is not good during transportation, improper transportation packaging will also cause damage to the parts, resulting in a large measurement error of the instrument. 3, calibration cycle setting unreasonable measuring instruments Calibration cycle need to be set according to the type of instrument, use, frequency of use and other factors, for high precision requirements, small error allowed range, high frequency of use of instruments, calibration cycle is shorter than other instruments. Like ordinary instruments are generally calibrated 1 time a year, the precision requirements are low, the error allowed range is large, the frequency of use is very low can be calibrated 1 time in 2-3 years, but the precision requirements are high, the error allowed range is small, and the instrument with a high frequency of use must be calibrated 1 time in 3-6 months, like this type of instrument that needs 3-6 months to calibrate 1 time, if the calibration cycle is set to 1-3 years, It is easy to misregister over time.

4, measuring instruments quality problems Measuring instruments precision requirements are high, so its own structure is also very different from ordinary instruments, the biggest feature is that there are more parts, complex components characteristics. Therefore, the measurement instrument in the production of the selected parts of the material requirements are also very high, such as elasticity, strength, density and other properties have higher requirements, if the material screening problem, the selection of some performance of the material can not meet the requirements, or in the production of some links of the problem, will affect the quality of the instrument, so that it in the calibration cycle of misalignment. Since there are many reasons for instrument misalignment during the calibration cycle, what strategies should we adopt to avoid the occurrence of misalignment? In fact, this is not difficult to understand, as long as the right medicine can cure the disease.

The effective countermeasures for the phenomenon of misalignment are to take measures according to the causes, as follows: 1, effective technical training for metering personnel Improper use and operation stems from the use of the operator of the instrument and equipment and its maintenance do not understand, through the use of the operator's technical training, can help them in the specific use of the operation process to pay attention to the protection of the equipment, so as to avoid damage to it. 2. Strengthen the protection of measuring instruments In order to prevent measuring instruments from being affected during transportation and storage, it is necessary to pay attention to the protection of measuring instruments such as collision protection and corrosion protection. For example, anti-collision packaging should be done during transportation to avoid collision and vibration during transportation and handling, which will affect the performance of the mechanism. In storage, it is also necessary to do a good job of dust, moisture and other protective work, through cleaning and maintenance, protective packaging and other measures to effectively avoid acid and alkali substances, air dust and humidity on the performance of the measuring instrument components and reduce the accuracy of the measuring instrument.

3. Scientifically set the calibration cycle of measuring instruments For measuring instruments that are easy to be affected in use, the calibration cycle should be reasonably set according to their characteristics and frequency of use, so as to avoid the occurrence of a reduction in accuracy and measurement misalignment caused by an excessively long calibration cycle. At the same time, do a good job of maintenance work, such as the calibration process found that the problem of misalignment or deviation is too large, to repair as soon as possible. 4, calibration before use, adjust the scope of use if necessary In order to avoid the use of quality problems of the measuring instrument, after the purchase, before use, should first calibrate the measuring instrument, for misalignment or does not meet the use of accuracy requirements, the manufacturer is required to replace. If the accuracy drops due to improper storage and does not meet the original requirements, the scope of use can be adjusted. For example, when the accuracy of measuring instruments used in scientific research and production does not meet the requirements of use, the measuring instruments should be disabled, or the use of standards should be downgraded and only applied to the operation of low measurement accuracy 1. For measuring instruments that have reached a certain service life, no matter how accurate they are, they should not be used for measuring work with higher accuracy requirements, to prevent the measurement work from being affected by errors and misalignment that exceed the specified range in use, and the measuring instruments whose measuring accuracy seriously does not meet the standard should be scrapped. To sum up, the misalignment of measuring instruments in the calibration cycle will bring a lot of inconvenience to production and life, and may even cause great losses. Relevant personnel should first calibrate the measuring instruments before use, conduct a comprehensive analysis of the measuring instruments that are out of alignment during the calibration cycle, and take effective measures as soon as possible to improve the accuracy of the measuring work.