Research on AC voltage source measurement system based on Joseph quantum voltage

A measurement system for AC voltage source was designed based on AC/DC thermoelectric conversion technology By analyzing the error sources of the measurement system, a DC voltage self calibration scheme based on Joseph Quantum voltage was designed The DC voltage self calibration system uses differential sampling principle to directly trace the DC voltage source to the Josephson quantum voltage standard The polynomial least squares fitting curve algorithm is used to determine the calibration coefficient of the DC voltage source Through analysis, it is proven that the polynomial least squares fitting curve algorithm can reduce the uncertainty components introduced by linear fitting during the calibration process Through comparative experiments with test data from the China Institute of Metrology, the results showed that the device has high accuracy and stability characteristics