1、 Power testing instruments, apparatus, and testing equipment for testing accuracy
The precision of an instrument is called accuracy, also known as precision. Accuracy and error can be said to be twin brothers, because there are errors, precise concepts. The accuracy of an instrument is only the precision with which the measured value is close to the true value, usually expressed as relative percentage error (also known as relative folding error). The formula for relative percentage error is as follows: δ - the relative percentage error during the detection process; (Proportional upper limit - Proportional lower limit) - Instrument measurement range; Δ x - Absolute error, the difference between the measured parameter value x1 and the measured parameter standard value x0.
The so-called standard value is the value measured by a standard instrument, which is 3 to 5 times higher than the instrument being tested. The accuracy of the instrument is not only related to absolute error, but also to the measurement range of the instrument. The absolute error is large, the relative percentage error is large, and the instrument accuracy is low. If two instruments with the same absolute error have different measurement ranges, the relative percentage error of the instrument with a large measurement range is small and the accuracy of the instrument is high. Accuracy is an important quality indicator for instruments. It is commonly used for standardization and representing accuracy levels. Accuracy is the maximum relative error obtained by subtracting the sign and%. According to national unified regulations, the grades are 0.005, 0.02, 0.05, 0.1, 0.2, 0.35, 1.0, 1.5, 2.5, 4, etc. The accuracy level of the instrument is generally marked on the instrument scale or label, such as 0.5, etc. The smaller the quantity, the higher the accuracy of the instrument.
2、Refer to the reproducibility of power testing instruments, apparatus, and testing equipment
Measurement reproducibility refers to the degree of consistency in the environment of measurement results under different measurement conditions (such as different methods, different observers) when the same detection amount is detected by different detections. Measurement reproducibility will definitely become an important performance indicator for instruments. The accuracy of measurement is not only the precision of the instrument, but also includes the influence of various factors on the measurement parameters, which is the comprehensive error.
3、 Refer to reliability instruments for gas labeling caused by power testing instruments, instruments, and testing equipment
Reliability is another important performance indicator pursued by chemical industry instrument workers. Reliability and instrument maintenance are opposite, with high reliability indicating minimal instrument maintenance. On the contrary, the reliability of the instrument is poor and the maintenance of the instrument is significant. For inspection and process control instruments in chemical enterprises, most of them are installed in process pipelines, various towers, kettles, water tanks, as well as in environments with the highest toxicity, flammability, and explosiveness in chemical production. The maintenance conditions for these instruments are harsh and many difficulties have increased. One is to consider the safety of chemical production, and the other is related to the personal safety of instrument maintenance personnel. Therefore, chemical companies require minimal maintenance for inspection and process control instruments, which means that the reliability of the instruments should be as high as possible.
4、 Refer to the stability of power testing equipment, instruments, and testing devices
The ability of an instrument to maintain certain performance characteristics over time under specific operating conditions is called stability (degree). Instrument stability is a performance indicator that is of great concern to chemical companies' instruments. Due to the relatively harsh environment in which instruments are used in the chemical industry, the measured medium temperature and pressure changes are relatively large. In this environment, the use of instruments and the ability of certain parts of the instrument to remain unchanged over time will decrease. Stability will decrease The characteristics of bias or instrument stability have not been quantified yet, and chemical companies typically use instrument zero drift to measure instrument stability. After one year of operation, there is no drift in the zero position of the instrument. On the contrary, within less than 3 months of operation, the zero position of the instrument changed, indicating poor stability of the instrument. The stability of an instrument is directly related to its range of use, and sometimes directly affects the production of chemicals. The impact of poor instrument stability often has a greater impact on the production of chemicals. The stability of the instrument is poor. The maintenance of instruments is also very important, which instrument workers do not want to see
5、 Manufacturers of power testing equipment and instruments
When purchasing power testing equipment, some units are cheaper. I don't know there is an old saying in China: 'Good goods are not cheap, cheap is not good.' Some manufacturers use this mentality to reduce production costs. Therefore, the quality of the instrument is caused by cutting corners and materials. Therefore, when purchasing electricity testing equipment, it is necessary to choose old enterprises with a certain scale and good reputation, and even go to the enterprise to understand the actual situation
In fact, what we mentioned above is not only the aspects that need to be paid attention to when purchasing series resonance, but also most of the instruments and meters that we need to consider when purchasing.
Wuhan UHV specializes in producing series resonant cables (also known as series resonant cable withstand voltage) and has been engaged in the electrical measurement industry for many years. Its products have first-class quality and welcome customers to come and purchase.
