Testing Tantalum caps

Discussion in 'General Electronics Chat' started by Johndon2000, Jun 21, 2013.

  1. Johndon2000

    Thread Starter New Member

    Jun 12, 2013
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    On a previous post someone mentioned that Tantalum Caps have high failure rates and are a good point to start when faulty finding... if a board has 40+ tantalum caps is there an easier method of testing the caps other than taking them all off 1 by 1 and measuring capacitance?!
     
  2. PackratKing

    Well-Known Member

    Jul 13, 2008
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    Unfortunately, you must pull up at least one leg
     
  3. RichardO

    Well-Known Member

    May 4, 2013
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    You can test ESR in some circuits without unsoldering the capacitor. If the ESR is too high then the cap is surely bad. If the ESR is OK there is still a chance the cap is bad -- for instance, the leakage may be excessive.
     
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  4. crutschow

    Expert

    Mar 14, 2008
    12,991
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    It depends upon the other impedances connected to the capacitor at that node. If the other impedances are high then you may be able to measure it in the circuit. Otherwise you will need to lift one leg of the cap.
     
  5. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    General tantalum failure is shorted, which should be obvious from a ohms test or the fact it has burn marks. ;)
     
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