1. Physikalisch-Technische Bundesanstalt (PTB),Dept. 2.3 - Electrical Energy Measuring Techniques,Braunschweig,Germany
2. Electronic, and Information Engineering Alma Mater Studiorum - University of Bologna,Dept. of Electrical,Bologna,Italy,40136
3. Istituto Nazionale di Ricerca Metrologica (INRIM),Torino,Italy
4. Institute of Electrical Power Engineering and High Voltage Engineering (IEEH) Technische Universität Dresden,Dresden,Germany
5. TÜBİTAK National Metrology Institute (TÜBİTAK UME),Power and Energy Laboratory,Kocaeli,Türkiye
6. VSL, Dutch Metrology Institute,Delft,The Netherlands