I read somewhere that if sampling two signals with frequency f and a sampling rate of N. Then the uncertainty in phase shift between the two signals will be 360*f/N. Someone know under which conditions this is true and how this uncertainty can be minimized? Next question is, suppose the signals contains harmonics with order n, will then the uncertainty in phase angle between the harmonic be 360*n*f/N? The background is I try evalute high frequency powers from sampled data of V and I. The problems are negative powers and strange phase shifts etc.. Someone can explain if zero-point detection and PLL can remove the uncertainties in FFT and sampling?
phase accuracy and sampling rate | PLL and FFT
Started by ●December 13, 2009