Calibration and measurement capability (CMC) that can provide calibration and measurement capability to the user in the normal conditions. CMC has a variety of expressions. Regression analysis is a statistical technique for studying correlation between key quality characteristics and the cause variables. After independently collecting n groups of experimental data(xi, yi), i=1,2,…,n., we can measure the relevancy between the two variables with the correlation coefficient. According to the stipulations of digital multimeter’s calibration method in JJF1587-2016"Calibration Specification for Multimeters", we can analyse the sources of the measurement uncertainties mainly includes the following aspects. (1)Uncertainties of the measurements introduced by the standard instruments.(2)Uncertainties of the measurements introduced by the measuring instrument’s resolution.(3)Uncertainties of the measurements introduced by the measure repeatability. The components of the above uncertainties over analyzed and an expression method of CMC based on unitary linear regression equation has given.
KEYWORDS: Calibration, Oscilloscopes, Semiconductors, Signal processing, Data acquisition, Amplifiers, Power supplies, Measurement devices, Analytical research
Keysight B1505A Power Device Analyzer has many functional testing projects, the calibration method is more complex. This paper focuses on how to control the output current of Agilent B1505A, solves the problem of impedance matching when calibrating pulse width and we investigate the relatively high accuracy test pulse amplitude method. After comparing the technical specification of the oscilloscope TDS3032C with output current resolution, this paper uses the high-precision digital meter 3458A instead of oscilloscope as the standard for measuring the amplitude of pulse current. In this paper, we investigate the configuration problem of 3458A for the trigger level, the delay time and the integration time in the pulse test, which makes the test result more accurate. A calibration system is designed to convert the pulsed current through the Tektronix Company's current amplifier TCPA300 to smaller voltage signal, which can be read by 3458A. Thus, the 3458A is used to measure the high accuracy of 1-2V voltage amplitude. The method is verified through calibration to show higher accuracy, which has a strong practical application value. At last, we give the uncertainty evaluation in the calibration process , the result is less than Urel=0.2% (k=2). More accuracy than using an oscilloscope as a standard measurement.
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