Rn8209 measurement chip reference program rn8209 can measure active power, reactive power, active energy, reactive energy, and provide two independent active power and RMS, voltage RMS, line frequency, zero crossing interruption, etc. at the same time, it can realize flexible anti stealing scheme. Rn8209 supports all digital gain, phase and offset correction. The active power pulse is output from pf pin, and the reactive power pulse / user-defined power pulse frequency is output from QF pin.