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High Voltage Capacitor Testing.

Discussion in 'Repairing Electronics' started by Mariusmul, Dec 21, 2017.

  1. Mariusmul

    Mariusmul New Member

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    F4A5D013-D443-49E8-80F4-AB035D521BDB.jpeg
    How can I test these caps?Can I use a Megger /Insulation Tester ? Can this cap be charged by the Insulation Tester to 4000 Vdc and then read the resistance to calculate leakage current?I have a Digital Insulation tester that does AUTOMATIC DISCHARGE,will It damage the tester?OR any advise on how to perform a test on these caps.Thank you.
     
  2. joanz

    joanz New Member

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    have you tried using an ohmmeter, the fluke series of DVMs are good
     
  3. MikeMl

    MikeMl Well-Known Member Most Helpful Member

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    But they apply less than 5V to the capacitor when testing leakage in the auto-ranging "Ohms" position. Mariusmul is concerned about how much leakage his capacitors have when they are charged to 4000V.
     
  4. dave

    Dave New Member

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  5. unclejed613

    unclejed613 Well-Known Member

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    yeah, you need a real cap leakage tester for those. i don't even think a Sencore goes up that high... if you know what you are doing, you can make a voltage multiplier to take some low current high voltage AC and put it through the multiplier to get 4kv, then connect the cap across it with a 1 meg resistor in series on the ground side. every volt across the 1 meg resistor is a microamp of leakage. since most DMMs these days are isolated to 600-1kV, you will need a voltage divider across the output of the multiplier to measure it.
     
  6. CARRELAND

    CARRELAND New Member

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    Before testing a capacitor verify the cap is discharged if not discharge it through a some KOhms
    resistor first and then shorting the two wires, above all do not sshort the two wires first( because
    the spark may be occuring inside the cap and now your cap is probably FNG) instead between wires. That's the rule I learned at the
    begining of my career long time ago...
     
    Last edited by a moderator: Feb 13, 2018 at 3:52 AM

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