Accuracy of measurement and calibration method

Abstract: the accuracy of measurement and calibration method of information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. The precision of measurement can achieve is to choose the important index of the instrument, this paper tells the story of several different cases, the generation of error, calculation and calibration method. Hope for you to choose the appropriate measuring instruments will have certain help. A, the error of measurement. More flow meter manufacturers choose model price quote you are welcome to inquire, is the accuracy of measurement and calibration method of the article details below. The precision of measurement can achieve is to choose the important index of the instrument, this paper tells the story of several different cases, the generation of error, calculation and calibration method. Hope for you to choose the appropriate measuring instruments will have certain help. The measurement results, the definition of measurement error measurement error is minus by measuring the true value of difference, or error. Because the true value ( Also according to the theoretical value) Can't accurately get, actually with the conventional true value, are agreed to measurement uncertainty to true value of characterization of its range, so the measurement error in fact does not obtain accurate. Measurement uncertainty: show that reasonable given by measuring the value of dispersion, which is related to people's awareness to be measured, is through the analysis and evaluation of a range. Measurement error: it is showed that the results of measurement are usually deviated from the true value of the difference, it is objective existence but they cannot be sure. For example: the measurement result can be very close to the true value ( The error is very small) , but because of insufficient understanding, value given by the people fell in a larger area ( The measurement uncertainty is bigger) ; Also may actually measuring error is larger, but due to lack of analysis to estimate the uncertainty of give small. Therefore should be given due consideration in the evaluation of measurement uncertainty of various influencing factors, and the evaluation of uncertainty of the necessary validation. Second, the error of error can be divided into random error and systematic error can be expressed as: error measurement results = - True value = random error + system so any errors can be decomposed into the system error and random error of algebra and system error: due to measurement tools ( Or measuring instrument) Inherent error and defect of the theory of measuring principle and measuring method itself, experiments and the experimental personnel itself the restriction of the psychological physiological conditions of measurement error is called the system error. The characteristics of the system error is under the condition of the same measure, repeat the measurement result is small or large, and the error value or change according to certain rule. Reduce the system error of the method usually can change measuring tools or measurement, can also consider the revised the measurement result. Random error, random error and accidental error, even under the completely eliminate system error this ideal, repeating the same measurement object, will still be due to a variety of accidental or unpredictable uncertainties interference measurement error, known as the random error. The characteristics of random error is to measure the same object many times repeated measurement, the error of the measurement results are random fluctuation, is likely to be positive ( Measurement results is larger) And may also be negative, Small measurements) And the error absolute value and no rules. But error distribution obeys statistical law, show the following three characteristics: unimodal, namely error small more than large; Symmetry, namely positive error equals the negative error probability; Boundedness, the probability of large error is almost zero. From the distribution regularity of random error, the increase number of measurement, and according to the statistical theory to deal with the measured results can reduce the random error. 3, precision, accuracy and accuracy to use the same measurement tools and methods under the condition of the same measure for many times, if the measured value of random error is small, the small fluctuation measurement results every time, good repeatability, good measuring precision are also called the stability is good, therefore, to measure the size of the accidental error reflects the precision of the measurement. According to error theory, when measuring the infinite increasing number of cases, can make the random error tends to zero, and the measurement results and the true value deviation degree & ndash; — Measurement accuracy, will fundamentally depends on the size of the system error, and thus reflects the system error size measurement accuracy could reach. Accuracy is the floorboard of the accuracy and precision of measurement, in actual measurement, the precision influence may be largely system error, may also be primarily random error, of course, may also affect measurement accuracy are both cannot be ignored. Commonly used in some measuring instruments, precision of this concept, actually includes two aspects of system error and random error, such as the commonly used instrument is often in precision instrument rating. The accuracy of instrument accuracy or precision, say again. Can say it's twin brother, accuracy and error because of the existence of the error, precision is the concept. Instrument accuracy in short is the accuracy of the measured values closer to the true value of the instrument, usually with relative percentage error ( Also called relative reduced error) Said.

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