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Since Al's valiant effort to help me determine the directionality of these caps has failed to produce an answer, I emailed Parts Connexion, who sold me the Mundorf caps. The end of the capacitor that was connected to the com lead and the ground wire when the lower of the two measurements occurred is connected to the capacitor's outer foil. Connect the other lead of the meter to the opposite end of the meter than it was originally connected to. Connect the com lead of the meter and the wire from the wall plate screw to the opposite end of the capacitor than the end they were originally connected to. Remove the three connections from the capacitor. If not, drape the AC power cord of some powered up electrical device across the capacitor, and see if that gives you a reading.
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Put your hand on the capacitor, and see if you get a reading. Connect the other lead from the meter to the other end of the capacitor. Connect the wire from the wall plate screw to that same point, perhaps holding it in place with an alligator clip that may be provided with the meter, or that may be attached to the end of its lead. Connect the meter's com (common) input lead (or whatever the equivalent nomenclature may be on the particular meter) to one end of the capacitor. If the meter has a "LoZ" (low input impedance) provision, disable it. Set the meter to read AC voltage, on a fairly sensitive scale that would resolve a millivolt or so. I'll describe the procedure as if that wire is necessary, although I'm not completely certain that it will be necessary.
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That could be done by connecting a piece of ordinary hookup wire between the screw on the wall plate of an AC outlet, and the capacitor lead to which the DMM's "common" terminal is connected. Thinking about it a little further, I believe that to get meaningful readings with a battery powered DMM you MIGHT have to provide it with an AC ground reference. Please forgive my ignorance, but once I have the meter, what exactly do I do?There's no ignorance to be forgiven, aside perhaps from my own :-)