In January and February 2016 first ACQ-PRO research visits occurred. Adam Tatar from GUM (Główny Urząd Miar, Poland) and Recep Orhan from TÜBİTAK (TÜRKİYE BİLİMSEL ve TEKNOLOJİK ARAŞTIRMA KURUMU, Turkey) visited NPL (National Physical Laboratory, United Kingdom) where under the guidance of Jonathan Williams several experiments and measurements were conducted. System used by researchers was based on 1 V Josephson junctions array made in AIST (National Institute of Advanced Industrial Science and Technology, 産業技術総合研究所, Japan) and binary bias source designed and build in NPL. The SNS array of 32 767 junctions was used to generate DC signal of maximum voltage 1.08 V and sinewaves of maximum voltage 0.76 V RMS. During the visit researchers checked and calibrated bias source and made precise current/voltage measurements of Shapiro steps – its width and step centre. Different AC quantum voltages were generated. Stable filtered DAC sinewave compared with quantum sinewave was used for AC/DC transfer which was made with Datron 4920 multimeter. A Shapiro steps are shown on following figures.