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Rogowski coil is made having nonmagnetic material in a core, which results in that Rogowski coil has typically been used to measure large pulsed currents. Therefore, studying the high-frequency performance of the coil is important to design an appropriate sensor for measuring heavy currents. The paper presents some analysis on the influences of the dimension and electromagnetic parameters of the coil. Some considerations and methods of optimizing these parameters have been proposed. Issues related to the geometrical effects and error characters of Rogowski coil are discussed. The prototype equipment embodies a differentiating Rogowski coil, specifically designed to obtain the reliability and scalability to meet the needs of measurement applications. Experimental results verify the validity of the proposed considerations for measuring pulsed currents.