An aspect of the present invention is a method of forming a contact in a thin-film device. 6\xd710\u22123, as obtained from the BET specific surface area and the total molar amount of OH groups and CO groups at the surface obtained by a titration method. The integrator samples the comparison signal and converts the comparison signal into one-bit digital data. The center of a largest such shape is mapped back into the units of the original eye diagram as optimum sampling parameters for data analysis equipment that uses the receiver to sample the signal once per unit interval to discover logical value. The filter elements are connected with at least one filter bracket to form at least one filter insert, and the filter insert is detachably connected to the filter housing.