Patent ID: 8024143
Filing Date: 2011-09-20
Classification: G01R

Abstract:
1. A method for ascertaining a mains frequency in a voltage signal using a mains analyzer, the method comprising: stipulating a sample frequency f polling a voltage signal, using a pair of connections of the mains analyzer, at N equidistant times in X periods of the sample oscillation, where X=5, 6, 7, . . . , to obtain N sample values x ascertaining, in the mains analyzer, a first phase φ  where 1=0, 1, . . . and w (n) is a window function; ascertaining, in the mains analyzer, a second phase φ  where m=1, 2, 3, . . . , with m>1; and ascertaining, in the mains analyzer, a frequency f on the basis of the formula  as the mains frequency.