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 How to test a capacitor
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olddawgsrule
Advanced Member


USA
1434 Posts

Posted - January 30 2012 :  17:39:21  Show Profile  Visit olddawgsrule's Homepage Send olddawgsrule a Private Message  Reply with Quote
Title says it all.

Capacitors are new to me.

I'm reading and learning how to use, but I haven't seen 'How to test' them to see if what I salvaged is any good.



Old in age, not in mind, so
'Teach me something new'!

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TinMan
Advanced Member



4082 Posts

Posted - January 30 2012 :  20:57:12  Show Profile Send TinMan a Private Message  Reply with Quote
Hi ODR-just put some power in them and make sure it dosnt leak out to fast-the voltage limit should be on the cap itself.Caps will eventualy drain down-but should be very slow.The side that has the doted line going down it is negative for polorised cap's

Swim at 90 degree's to the current and gain speed in two directions while only doing half the work
>>>>TinMan<<<<
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Kudzu
Administrator



USA
1619 Posts

Posted - January 31 2012 :  01:46:51  Show Profile Send Kudzu a Private Message  Reply with Quote
Hey ODR ,
I've been checking the cap's I pull out of stuff with a 9v battery and a multimeter . You could use a group pack of battery's or a power supply .. I Just make sure I don't put more in them than there rated for . First I Check the voltage I have in my battery and then put negative to negative / positive to positive, battery to cap ( on most cap's it's instant transfer ). The voltage you just put in should show same as the battery voltage was, now also in the cap when you check it with the meter , with low uf cap's they start to drain instantly from your multimeter being connected . I've seen if some of the cap's are not marked with at least a negative there usually AC cap's . Hope that help's ya

==================================================

I still think the only dumb questions are the one's you didn't ask ...

Edited by - Kudzu on January 31 2012 01:52:36
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olddawgsrule
Advanced Member



USA
1434 Posts

Posted - January 31 2012 :  11:10:25  Show Profile  Visit olddawgsrule's Homepage Send olddawgsrule a Private Message  Reply with Quote
Thanks guys!

I would consider my 2000uf caps as reasonably small, but what do I know.. I'm just learning..

I have 2 pairs of 2000uf cap's.
One pair being 25v and the other 16v.

These are the cap's setup in Poppy's VD.


I have conversed with Poppy to insure connections and seem to have them right, but 'no joy' on a start.

I am using the Daftman/Bendini circuit and have dis-connected the jumper between run & charge (as Poppy instructed).

I figured the cap's may be the problem, they are salvaged..

Holding power to the cap for as long as 5 seconds and the time it takes to grab the meter and test, they do not match the battery.

Now that I see the voltage should be there on initial meter test and can slowly run down (just from the meter being hooked up), I'll test the balance of what I have and see how they do.

Again, thanks guys!

Old in age, not in mind, so
'Teach me something new'!

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olddawgsrule
Advanced Member



USA
1434 Posts

Posted - January 31 2012 :  14:48:47  Show Profile  Visit olddawgsrule's Homepage Send olddawgsrule a Private Message  Reply with Quote
After testing my cap's, I'm very happy with 2 of each voltage, but not of matching pairs (all 2000uf, 1 pr 16v, the other 24v)

Being of same compensation, combining two of unequal voltage should result in a voltage or wattage of the lesser.

Close? Huh?? Maybe??? Can I do it with expected results????

I'm only asking first, cause I haven't burned out a circuit in a week and hoping to start a 'new' trend.


Old in age, not in mind, so
'Teach me something new'!

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TinMan
Advanced Member



4082 Posts

Posted - February 06 2012 :  03:23:57  Show Profile Send TinMan a Private Message  Reply with Quote
Hi ODR-Poppy's VD-sounds medical lol.You will be able to have a voltage of 32 volts across both caps as they are hooked in series,so double the cap with the leser voltage,any more than that may cause smoke or a small explosion lol (CB would be proud of you then )

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Magneticitist
Senior Member



USA
681 Posts

Posted - February 06 2012 :  09:21:48  Show Profile  Visit Magneticitist's Homepage Send Magneticitist a Private Message  Reply with Quote
nothing like hearing that loud pop and getting electrolyte splashed all in your eyeballs.. good times.

[on the gravy train with biscuit wheels]
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