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Novel calibration method for high-precision source-meter integrated measuring equipment

A technology of measuring equipment and calibration method, which is applied to measuring devices, measuring electrical variables, complex mathematical operations, etc., can solve the problems of large calculation amount, unstable system, poor practicability, etc., and achieves easy implementation, small calculation amount, and applicability. strong effect

Active Publication Date: 2020-01-07
湖南银河电气有限公司
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Problems solved by technology

The Newton iterative method has high requirements on the initial value. When the initial value is selected more accurately, the convergence is very fast, but the derivative of the function must be calculated at each step, which makes the calculation amount very large, and the division method is also introduced, which is easy to cause the system to fail. Stable; and advanced intelligent algorithms require complex calculation process and huge amount of calculation, poor practicability

Method used

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  • Novel calibration method for high-precision source-meter integrated measuring equipment

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Embodiment

[0028] The following takes the voltage of the SMU as the calibration object, and describes the specific implementation method in the range of 100-1000V under the condition of 50Hz.

[0029] The following table is the raw data obtained:

[0030] Table 1

[0031]

[0032] First, the measured value of the SMU is calibrated, and the calibration expression is obtained by using the nonlinear least square method through formula (1):

[0033] X'=-9.4847*10 -11 *X 3 +1.91653913*10 -7 *X 2 +0.999189812*X-0.0992891821 (3)

[0034] Substitute the measured value X of the SMU before calibration to get the measured value X' after calibration.

[0035] Then the setting value of the SMU is calibrated, and the calibration expression is obtained by using the nonlinear least square method through formula (2):

[0036] Z'=-4.394824*10 -9 *Z 3 +6.63190422*10 -6 *Z 2 +0.998267961Z+0.183169069 (4)

[0037] Substitute the setting value Z of the SMU before calibration to get the setting ...

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Abstract

The invention relates to a calibration method for measuring equipment, in particular to a novel calibration method for high-precision source-meter integrated measuring equipment. The method comprisesthe following steps: acquiring original data; analyzing the obtained original data; carrying out fitting on actually measured values by using an output true value as a fitting object to obtain a calibration coefficient; and with a set value Z as a fitting object, carrying out fitting on an output true value Y to obtain another group of calibration coefficients and carrying out correction by a microprocessor based on the two groups of calibration coefficients and the original data to obtain a calibrated actually measured value and a calibrated set value. According to the invention, the novel calibration method is an efficient fitting method based on a nonlinear least square method; and cubic spline function is selected as a fitting function. Because calculation of an inverse function is notneeded, derivation and division of a Newton iteration method are avoided; and one group of calibration coefficients can be obtained only through six times of multiplication and three times of addition, so that the complex calculation process and a huge calculation amount of an advanced algorithm are not needed.

Description

technical field [0001] The invention relates to a calibration method for measuring equipment, in particular to a novel calibration method for high-precision source-meter integrated measuring equipment. Background technique [0002] With the advancement of science and technology and the development of society, various industries are pursuing higher and higher performance of equipment, and high-precision instruments and meters will gain a wider application space. High-precision source-meter integrated measurement equipment (Source Measure Unit, referred to as SMU), as an important branch of high-precision instrumentation, needs to undergo strict calibration before it is put into use to ensure that the real output value and measured value are consistent with the output true value be consistent. Modern SMUs have the characteristics of wide range and high resolution, and some even require voltages with a resolution of 0.1V and a range of 1 to 10,000V to achieve an accuracy of 1 / ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D18/00G01R35/00G06F17/10
CPCG01D18/00G01R35/005G06F17/10
Inventor 刘国福徐伟专甘伟尚帅文诚胡能钢熊艳
Owner 湖南银河电气有限公司
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