Before each measurement, the X capacitance of the filter was measured using a network impedance analyzer. The X-capacitor value is the capacitance of the filter construction plus the parallel total of the actual values of the physical X capacitors (C3||C4). The resistance of the shunt resistor, R1, was measured with a multimeter to obtain R1meas. C = capacitance of the X-capacitor system, as listed in Table I.