Uncertainty measurement experiment introduced by different levels of pHmeter

In the paper "Uncertainty Components Introduced by Different Grades of pH Meters in Measurement", Xiu Hongyu and He Xinyang did experimental research on the measurement of uncertainties introduced by different grades of pH meters. The pH meter of known level measures the pH value of the solution. In the uncertainty evaluation of the measurement results, the uncertainty of the pH meter can be regarded as a known uncertainty component introduced by the measurement method, so that the measurement The procedure for evaluating the uncertainty of the results is greatly simplified. The pH meter verification adopts the standard solution measurement method, that is, after calibrating the instrument with a standard solution, measure the pH value of another standard solution, and compare the measured value with the standard value of the standard solution to obtain the total error of the instrument ’s indication .