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Esr capacitor tester

Discussion in 'General Electronics Discussion' started by mrel, Jun 20, 2017.

  1. mrel

    mrel

    84
    0
    Jul 2, 2008
    Hello
    Does Esr capacitor tester, test all different types of capacitors or just electrolytic capacitor?
    mrel
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,215
    2,695
    Jan 21, 2010
    Pretty much just electrolytic.

    The reason is that the tester requires the capacitance to be sufficient such that the test impulse does not significantly charge the capacitor. In practice this generally eliminates the testing of many non-electrolytic capacitors.

    Having said that, there are ceramic caps with high enough capacitance to test (mlcc caps).
     
  3. 73's de Edd

    73's de Edd

    2,744
    1,133
    Aug 21, 2015
    Sir mrel . . . . .

    ALL types . . . . BUT . . . . ESR is mainly being a problem emcountered with electrolytics .
    Particularly ones that are subjected to high frequency or pulse related handling along with a parallel potential to run warmer, just by virtue of those conditions.

    What few high capacitance non electrolytic capacitors I do have, of which the highest I have would be a 22 ufd mylar dielectric unit @ 50 working volts . . . .and many-many of cascaded lower values.

    I will measure them and use them as " GOLD STANDARDS " . . . . to see if any electrolytic can even approach their low ESR values.
    You just have to test-test-test and TEST several units to get the idea of average expected ESR values.

    Plus, don't get thrown off if you come up against a 10 ufd @ 450VDC, since its inherently going to have a higher ESR than you had been accustomed to finding at lower working voltages.

    If you want to prove something to yourself, test a high value cap for its ESR value and then take a 10 ohm resistor in series with the same cap and retest again.
    Taking a 270 ufd capacitor at 25VDC you would find yourself having a mere 60ufd or so, actually being the equivalent capacitance then functioning in your circuit.

    73's de Edd
     
    Richard9025 likes this.
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