Accuracy grade: the concept of accuracy grade of instruments, meters and equipment; Under normal use conditions, the accuracy of instrument measurement results is called the accuracy of instrument. The smaller the citation error, the higher the accuracy of the instrument, and the citation error is related to the measuring range of the instrument. Therefore, when using instruments with the same accuracy, the measuring range is often compressed to reduce the measuring error. In industrial measurement, in order to express the quality of instruments conveniently, the precision grade is usually used to express the precision of instruments. Accuracy is the maximum citation error minus a positive value. Negative sign and percentage sign. Accuracy grade is one of the important indexes to measure the quality of instruments. China's industrial instruments are classified into seven grades: 0. 1, 0.2, 0.5, 1.5, 2.5 and 5.0, which are marked on the instrument scale or nameplate. The accuracy of instruments is customarily called accuracy, and the accuracy grade is customarily called accuracy grade.

Instrument accuracy = (maximum absolute error/instrument range) * 100%

Take the absolute value of the above formula and subtract%, which is the accuracy level we see.

The accuracy of the instrument is divided into several grades according to the allowable error stipulated by the state. The allowable error of a certain kind of instrument refers to the maximum allowable percentage error under the specified normal conditions. The accuracy grades of process detection control instruments in China are 0.005, 0.02, 0. 1, 0.35, 0.5, 1.0, 1.5, 2.5, 4, etc. General industrial instruments are 0.5 ~ 4. The smaller the accuracy number, the higher the accuracy of the instrument.

"Fluke 744"

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