Provide - High precision Hall current sensor - Guidance [Weikewei]

1. Indicators that characterize the quality of measurement results

Accuracy, precision, and uncertainty are commonly used to describe the reliability of measurements.

(1) Accuracy. The degree to which the measurement result deviates from the measured value due to system errors. The smaller the system error, the more accurate the measurement result.

(2)preciseDegree. The degree to which the measurement results obtained from repeated measurements under the same conditions are consistent with each other. The smaller the random error, the more precise the measurement result.

(3) Accuracy. The degree to which the measurement result is higher than the true value being measured. The smaller the overall error, the more accurate the measurement result.

(4) Uncertainty. The differentiability of the measured value of reasonable putty is a parameter related to the measurement results. The smaller the uncertainty, the better the measurement resultThe higher the credibility.

2. Evaluation steps for measurement uncertainty

After calibrating or verifying the measuring equipment, a calibration or verification certificate should be issued. After measuring a certain object, the measurement results should also be reported, and the measurement uncertainty should be explained in the given measurement results. The following are the general evaluation steps for measuring uncertainty:

(1) Clarify the definition and measurement conditions of the measured object, clarify the measurement principles and methods, the mathematical model of the measured object, as well as the measurement standards and equipment used;

(2) Analyze and list the uncertainty components that have a significant impact on the measurement results;

(3) Quantitatively evaluate the uncertainty components of each standard and provide their numerical values u_iAnd degrees of freedom;

(4) Calculate the composite standard uncertainty u_cAnd degrees of freedom v_eff；

(5) Calculate the expanded uncertainty U;