We present a quantitative assessment of the accuracy in reconstructing the near fields from assigned field data with various source reconstruction formulations. Accurate and robust computation of near fields is of great interest in diagnostic applications from real measurements, which are unavoidably affected by noise and/or measurement uncertainties. Tests are performed with finite signal-to-noise ratio (SNR) synthetic data and with measured data; they indicate that only the recently introduced dual-equation formulation provides a reliable reconstruction of fields in the close vicinity of the equipment under test.