The EC-7VAR Power Energy Data Logger is specifically designed to monitor one, two or three current channels, as well as one, two or three voltage channels. It allows you to monitor the loading and energy consumption of the installation. Power Factor recorded is the phase angle between L1 and A1. Amp ranges are selectable from 400 or 3000 AAC. Why is the Electrocorder better than other similarly priced competitors? The Electrocorder range use a constant sampling technique, unlike the single reading of competitors. When the loggers start to record, they sample every channel 16 times per cycle, a cycle is 16ms at 60Hz and 20ms at 50Hz.