Device for measuring and checking errors of digital mutual inductor

The invention discloses a device for measuring and checking errors of a digital mutual inductor, which comprises a phase self-calibration unit, a standard mutual inductor signal processing unit, a processing unit and a digital phase-locked loop unit, wherein the phase self-calibration unit is used for generating a calibration signal; the standard mutual inductor signal processing unit is used forreceiving an input signal of a standard mutual inductor or the calibration signal, and outputting a first analog signal and a first digital signal which corresponds to the analog signal and is subjected to analog/digital conversion after the processing; the processing unit receives the first digital signal and a second digital signal which is from a digital mutual inductor to be tested and synchronous with the first digital signal, and analyzes and calculates fundamental components of various signals and harmonic components in each time to obtain an angular difference, a phase difference and a phase error of the digit