Bumble Bee capacitors: Difference between revisions

Bumble Bee capacitors (view source)

1 byte removed , 19 June 2018

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 # 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 an 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 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.
 # 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.