The reason why the pressure calibrator measures the indication error of the instrument: the difference between the measured value of the measuring instrument and the true value of the corresponding input. The reason why the pressure calibrator measures the indication error of the instrument: the difference between the measured value of the measuring instrument and the true value of the corresponding input. Aspherical Lens,Aspheric Condenser Lenses,Convex Aspheric Lenses,Precision Molded Aspheric Lens China Star Optics Technology Co.,Ltd. , https://www.csoptlens.com
The calibration process for obtaining the indication error can be regarded as a special measurement process whose purpose is to obtain the "indication error of the measuring instrument pressure calibrator". The difference between measurement and calibration is that the “person†who performs the calibration is a specially trained and qualified calibrator with this instrument calibration; the “machine†used for calibration is the standard specified by the calibration procedure or calibration specification. Or a standard device, which has a quantified input; the "material" of the calibration is the instrument being calibrated and also has a quantified input; the "method" of the calibration is the calibration method specified by the verification verification procedure or the calibration specification; The "measurement" is that the calibrated measurement system (ie, the standard) itself has to pass the verification and is within the validity period; the calibrated "tube" is the calibration process of the calibration laboratory to be nationally recognized or internationally recognized and its complete set of management procedures; calibration The “ring†is to be calibrated under the environmental conditions specified in the calibration procedure or calibration specification. At this time, under the combined effect, the input result is the indication error.
The uncertainty of the indication error in modern measurement has been gradually paid attention to and applied. In addition to the evaluation of the calibration capability of the pressure calibrator, it can also be used as a component of the uncertainty evaluation in precision measurement. With the continuous improvement of the environmental environment at the project site, especially the precision engineering with small “tolerances†of product parameters, the traditional mode of pressure calibrator used in stages has been difficult to meet the requirements for “seiko†measurement capability; at the same time, “Seiko†has higher and higher requirements for on-site environmental conditions, whether it is temperature, humidity, air cleanliness, electromagnetic interference, etc., which meets or exceeds the requirements of calibration laboratories, and provides correction or compensation for on-site calibration and calibration results. The conditions. Under this specific condition, the indication value of the instrument corresponding to the tolerance value of the engineering parameter is calibrated to obtain the indication error, which is the best estimate of the error caused by the calibration point instrument, and the synthesis standard is estimated. Uncertainty, with the sign value as the correction amount, the indication value is corrected or compensated as the measurement result.
The ultimate goal of the measurement is to achieve as close as possible to the measured true value, that is, the synthetic standard uncertainty of the measurement is as small as possible. Correct understanding of the meaning of the uncertainty of the indication error can make full use of the specific conditions and existing resources of the precision engineering, and pass the interaction between the calibration and measurement of the pressure calibrator, and directly transfer the magnitude of the standard instrument to the engineering measurement and control. The ability to achieve the process chain of engineering, measurement, and calibration is at its best, and the products that meet the requirements are stably output. This article Source: electromagnetic flowmeter http:// orifice flowmeter http://
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