Electronic transformer calibration method and apparatus

An electronic transformer calibration apparatus, comprising:

• an obtaining module, configured to obtain amplitudes and phase angles of sampled signals obtained by a tested signal acquisition unit by sampling different frequency signals, wherein the tested signal acquisition unit is a signal acquisition unit comprised in a to-be-calibrated electronic transformer;
• a first calculation module, configured to determine an amplitude gain factor and a time constant of the tested signal acquisition unit based on the amplitudes and the phase angles;
• a second calculation module, configured to determine a dominant pole and an amplitude factor of the tested signal acquisition unit based on the amplitude gain factor and the time constant;
• and
• a configuration module, configured to configure the dominant pole and the amplitude factor for a digital signal processing unit comprised in the to-be-calibrated electronic transformer, so that the digital signal processing unit performs digital filtering on an input signal based on the dominant pole and the amplitude factor, to obtain an output signal, wherein the input signal is obtained by performing analog-to-digital conversion on a signal output by the tested signal acquisition unit.