What is the best way to put a charge on a plate? By 'plate' I mean some mass of conductor surrounded by an insulator. The problem, really, isn't how to generate charge, I know I can use a Van de graff or high-voltage rectifier for that; the problem is that I need to be certain of how much charge is on the plate. I've looked into using a noncontacting field meter, but if I understand things right, I also need the capacitance to determine the charge on the plate. Also, I know that if I could precisely measure the current as the plate was being charged, I could combine that with the time to get the coulombs, but that is such a short time and such a small current that I doubt it would be very effective. Any suggestions would be greatly appreciated.