Standard type verification of three-phase smart meters is performed under idealized balanced test conditions that do not fully reproduce the current unbalance, single-phase loading and voltage deviations found on real distribution networks, so that a channel-specific calibration fault can pass undetected. This paper presents a methodology combining standard IEC~62052-11 and EN~50470-3 verification with an extended set of near-real-network test conditions (unbalanced current distribution, single-phase loading, and voltage deviation from nominal), together with a statistical/machine-learning screening step applied to aggregated laboratory verification results and used to flag units for target... More >