A Method of Improving the Accuracy of Online Calibration of AC Sampling Device
An AC sampling and accuracy technology, which is applied in measuring devices, instruments, measuring electricity and other directions, can solve the problems of verifying the sampling accuracy of AC sampling devices, the difference in sampling quantity, and the level of less than 0.2, so as to improve work efficiency and test accurate effect
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[0029] The specific embodiment: the specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing:
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[0030] Embodiment: A method for improving the online calibration accuracy of an AC sampling device (see figure 1 ), the online AC sampling and verification device collects the secondary current (clamp ammeter access) and secondary voltage (direct access) of the AC sampling device, and through A / D analog-to-digital conversion, the continuous AC voltage and current The sine wave signal is digitized and converted into a series of digital signals that can be recognized by the computer, and become digital quantities (sampling values). The digital quantities can be used to calculate current, voltage, frequency, active power and reactive power through digital signal processing (DSP). These quantities are compared with the measured values of the AC sampling device, and the errors of each quantity are calculated, so as to judge whether the accuracy of the AC sampling device meets the standard, and realize the goal of online calibration of the AC sampling device.
[0031] It specifica...
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