Depending on the resolution needed to measure the current, customers can choose between 20, 30, 40, 50, 60, 70, 100 or 125 turns on the secondary side. For example, If the aim is to measure high frequencies, a variant with a corresponding small number of secondary turns would be optimal. The natural resonant frequency, which has a limiting effect, is higher in variants with fewer secondary turns than in those with many. This is due to the parasitic capacitance of the secondary winding.