Development of a Calibration Device for Broadband Power Standard Sources

Wide - band power measurement technology is widely used in many fields such as power systems, new energy power generation, industrial automation, variable frequency speed regulation, calibration of measuring instruments, and quality inspection of electrical products. The accurate measurement of related instruments such as wide - band power analyzers, power quality analyzers, and wide - band recorders is inseparable from wide - band power standard sources. To improve the value traceability system of wide - band electrical quantities, it is urgent to carry out research on the metrological standard devices of wide - band power standard sources. Based on virtual instrument technology, this paper studies and realizes a metrological calibration device for wide - band power standard sources, and elaborates on its hardware system architecture, software function algorithm design, and the complete system implementation process. To improve the accuracy of the developed calibration device, three key technologies are mainly applied: first, automatically correct the amplitude, phase, and frequency additional errors between the channels of the wide - band digitizer; second, calibrate and compensate the conversion ratio errors and angular differences of the wide - band signal conversion module at different frequencies; third, design a frequency measurement filter algorithm to improve the accuracy of fundamental frequency measurement and realize the integer - period transformation of equidistant sampling data. Verified by calibration tests carried out in accordance with JJF 2040 - 2023 “Calibration Specification for Power Analyzers”, it is proved that the developed calibration device can meet the calibration requirements of wide - band power standard sources of class 0.05 and below, providing strong support for the improvement of the wide - band electrical quantity measurement system.