Abstract：At present, Josephson quantum voltage is mostly used for the measurement of sinusoidal signals, and there is very little research on the harmonic signals. The feasibility of applying programmable Josephson voltage standard to harmonic measurements was investigated, in order to realize the harmonic voltage to the voltage quantum traceability .When using the staircase wave AC quantum voltage for harmonic voltage measurement, some data fluctuated greatly due to the transition process and the Gibbs phenomenon.If the data in the transition process is included in the Fourier transform, the recovered signal amplitude and phase will be distorted.To solve this problem, a new harmonic voltage calculation method, weighted Fourier transform was proposed.The method achieved accurate measurement of harmonic voltage by resetting the data weight in the transition process to zero. The experimental results showed that the amplitude and phase measurement results of harmonic voltage were ideal, the standard deviation of amplitude was less than 1 μV, and the standard deviation of phaseis was less than 15 μrad.
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