We are working with STPM10 to measure the Voltage,current,Active energy,Reactive energy and apparent energy. we are using 10W to 1KW load.with current calibration as +12% and Voltage calibration as +9%. Upto 400W load the readings are proper.but when we connect load above 400W the active energy register (DAP),reactive energy register (DRP) is reverse counting for some case of load.kindly provide when the register is starts countdown and how can we solve this issue