Ran across this post on reforming a capacitor:
http://forum.allaboutcircuits.com/showthread.php?t=32195&highlight=forming+capacitor
I have some new old stock 6300uf 25v screw terminal caps coming, but they are pretty old. They are new, but lord knows how they have been stored over the last 20+ years.
When I do the calculations suggested in the post, I get approx 28mA leakage current. The Datasheet formula is a bit different. It's formula works out to less than 1.5mA. The datasheet also says leakage not to exceed 4 mA. ESR is .028 ohms @ 120Hz.
I don't have the caps in hand yet and wanted to know if the 10k resistor in series is OK here too. An engineer at CDE told me to use a 1k resistor. I have a good variable supply, so not a problem there.
Any suggestions on how slow to bring the voltage up on these caps and how long to let them run? I will end up calling the manufacturer back on this, but wanted to ask here also.
I'm not sure if these caps will be any good still, but they were cheap enough compared to new ones to at least give it a shot.
They are Mallory caps, part no. CG632U025R3C.
Thanks.
http://forum.allaboutcircuits.com/showthread.php?t=32195&highlight=forming+capacitor
I have some new old stock 6300uf 25v screw terminal caps coming, but they are pretty old. They are new, but lord knows how they have been stored over the last 20+ years.
When I do the calculations suggested in the post, I get approx 28mA leakage current. The Datasheet formula is a bit different. It's formula works out to less than 1.5mA. The datasheet also says leakage not to exceed 4 mA. ESR is .028 ohms @ 120Hz.
I don't have the caps in hand yet and wanted to know if the 10k resistor in series is OK here too. An engineer at CDE told me to use a 1k resistor. I have a good variable supply, so not a problem there.
Any suggestions on how slow to bring the voltage up on these caps and how long to let them run? I will end up calling the manufacturer back on this, but wanted to ask here also.
I'm not sure if these caps will be any good still, but they were cheap enough compared to new ones to at least give it a shot.
They are Mallory caps, part no. CG632U025R3C.
Thanks.
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