Renewable energy sources are mostly operating in direct current (DC) and require, therefore, dedicated inverters to be integrated in the power system. This turns out in loss of rotational inertia as well as degradation of the power quality (PQ) indices. Low-voltage DC grids represent a promising alternative, though still lacking of well-established measurement methods. In this context, this paper describes the preliminary characterization of a transfer standard prototype for inter-laboratory comparison of DCPQ reference systems. The obtained results confirm the reliability of the proposed hardware and software architecture, that guarantees a worst-