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The time-domain calibration coefficient of a D-Dot sensor should be identical across various transverse electromagnetic (TEM) cells to comply with the IEEE Std 1309. However, in our previous calibration experiments, poor consistency was observed. The size of D-Dot sensors relative to TEM cells is considered the main reason for this poor consistency. Therefore, this study aims at determining the calibration coefficient of a D-Dot sensor. We calculate the theoretical coefficient as a reference. Practical cali-bration experiments involve the processing of TEM cells with three different sizes. To observe the response more clearly, corresponding models are constructed and numer-ical simulations are performed. The numerical simulations and experimental calibration are in good agreement. To determine the calibration accuracy, we quantify the accu-racy using the relative error of the calibration coefficient. By comparing the coefficients obtained, it can be con-cluded that the perturbation error is about 15％ when the relative size is over 1/3. Further, the relative size should be less than 1/5 to obtain a relative error below 10％.