Ken Smith wrote:

Heck, that can happen before you hit 1MHz. Check out the ESL and ESR of a
47,000uF capacitor some time.


How about dielectric absorption ("soak")? I first encountered this in an
electrolytic capacitor being used for generating a sweep of about a
minute duration. The capacitor had to be kept shorted for several
seconds between sweeps in order for the charge to adequately empty, an
equivalent frequency of less than one Hz.

Roy Lewallen, W7EL