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Bumble Bee capacitors: Difference between revisions
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3) Check for drift in capacitance: Discharge the capacitor. Measure it with a capacitance meter. If it is outside the original tolerance range, it should be replaced. | 3) Check for drift in capacitance: Discharge the capacitor. Measure it with a capacitance meter. If it is outside the original tolerance range, it should be replaced. | ||
4) Measure the ESR: Discharge the capacitor. Calculate the frequency at which the reactance of the capacitor should be 0.1 ohms. Set a 50-ohm signal generator to that frequency and an amplitude of 1 volt. Connect the signal generator to the capacitor. Probe the voltage across the capacitor with a good oscilloscope. There should be less than | 4) Measure the ESR: Discharge the capacitor. Calculate the frequency at which the reactance of the capacitor should be 0.1 ohms. Set a 50-ohm signal generator to that frequency and an amplitude of 1 volt. Connect the signal generator to the capacitor. Probe the voltage across the capacitor with a good oscilloscope. There should be less than 100mv of AC voltage across the capacitor. | ||
5) If the capacitor passes these three tests, it is probably OK, and the lifted terminal can be resoldered. It is a good idea to somehow mark the capacitor as having been checked. | 5) If the capacitor passes these three tests, it is probably OK, and the lifted terminal can be resoldered. It is a good idea to somehow mark the capacitor as having been checked. | ||