Remember that the capacitance is not always what the marked value states. Shown here the capacitance decreases as the frequency increases. If the dt response equates to frequencies of 1kHz or lower, roughly 1ms or longer, then there is no significant decay; but if the dt is specified as 10μs, then at the transposed frequency of 100kHz, there is a significant change in capacitance. For the lower ESRs, the capacitance decay is less. For KEMET’s T520 series polymer capacitor, the 100kHz capacitance is 88% of the low frequency, but for KEMET’s T495 and T491(T494) series, the capacitance drop to 25% and 12% of their initial capacitances, respectively. The calculation should then be adjusted by these new capacitance levels.