If I use Goertzel algorithm for calculate the magnitude of current or voltage, use for measure current harmonic or voltage harmonic or fundamental component. I not use for detect harmonic. Do you know the accuracy for measure harmonics is good or not?,How much about relative error?
Another one question is The Accuracy relative with number of data sample? Ex. If I have measure voltage harmonic, I measure waveform of current by use sample rate = 4000 Hz, target frequency for measure fundamental harmonic is 50Hz, so if I use number of sample (bin width) for Goertzel algorithm is 80 sample this is minimum, If I use more then 80 samples like 4000 sample the accuracy will more accurate right? how much better?