Calibration of RMS based on hardware compensation method and Least Squares Support Vector Machine
Download as PDF
Yan Huang, Anquan Deng, Tianyu Zhou, Wu Zhu
When the RMS measurement is performed on a wideband AC signal using a log-antilog operation circuit, a large nonlinear error is generated by the band limitation of the amplifier in the converter. Therefore, a new method for calibrating nonlinear errors using hardware calibration and software alignment is proposed. First, the hardware circuit with the voltage-frequency conversion chip VFC32 as the core is used for nonlinear calibration. The calibrated signal is then fitted using a least squares support vector machine. The test results show that the calibration accuracy can be achieved 0.014% within the frequency range of 50~20 ×103Hz.
Rms Converter, Nonlinear Error, Error Calibration, Hardware Compensation Method, Least Squares Vector Machine Algorithm