... measuring the energy of the refer DT862-4 Series Three Phase of Meter New Power Product Brief IntroductionDT862-4 series ... the measuring the energy of the reference frequency is 50Hz three phase AC active power and reactive power.DT862, DT864,DS862, ... DS864, are three phase active power electric meter,DX862,DX864,DX865,DX863 are three phase reactive power meter. DT862-4 Series Three Phase of Meter New ...