[en] Methods for calculation of an error in determining the cross-correlation function peak position depending on the relative change of the nominal values of the amplifier track descrete components for sodium flow rate measurements by method are described. The results of calculation experiments and relations obtained for low-frequency Chebyshev filters of the second order of magnitude in case of non-identity of the capacities in the feedback curcuit of the operational amplifiers, forming these filters are presented. 4 refs.; 5 figs