AircraftTroubleshooting use a LED to test extremely small leakage on a cap November 30, 2022 Todd's Time Here is a fluke meter + voltage source to test Gigohms with simple math GAN diode LED p/n C503B-GAS-CB0F0791, Datasheet high value test resistor, 1 gig resistor pn SM104FE-1000M-ND 10 gig Capacitor capacitance