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m (Peter moved page "Black Beauty" or "Bumble Bee" capacitors to Bumble Bee capacitors) |
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# Lift one end of the capacitor from the surrounding circuit. Follow the soldering instructions in the manual. | # Lift one end of the capacitor from the surrounding circuit. Follow the soldering instructions in the manual. | ||
# Check for DC leakage: To do this, you will need a DC power supply that has current limiting and goes up to the operating voltage of the capacitor. Disconnect one end of the capacitor. Attach | # Check for DC leakage: To do this, you will need a DC power supply that has current limiting and goes up to the operating voltage of the capacitor. Disconnect one end of the capacitor. Attach a sensitive ammeter in series with the power supply and the capacitor, and bring the power supply up to operating voltage of the capacitor. The DC leakage should be less than 3 μA. | ||
# 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. | # 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. | ||
# Measure the ESR: Discharge the capacitor. Calculate the frequency at which the reactance of the capacitor should be 0.1 Ω. Set a 50 Ω signal generator to that frequency and an amplitude of 1 V. Connect the signal generator to the capacitor. Probe the voltage across the capacitor with a good oscilloscope. There should be less than 100 mV of AC voltage across the capacitor. | # Measure the ESR: Discharge the capacitor. Calculate the frequency at which the reactance of the capacitor should be 0.1 Ω. Set a 50 Ω signal generator to that frequency and an amplitude of 1 V. Connect the signal generator to the capacitor. Probe the voltage across the capacitor with a good oscilloscope. There should be less than 100 mV of AC voltage across the capacitor. |
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