ESR meter not showing anything for 0.1uF

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  • jm1234
    Senior Member
    • Jan 2024
    • 59
    • Slovakia
    #1

    ESR meter not showing anything for 0.1uF

    Hi,
    my ESR meter doesn't show any ESR for this capacitor: https://www.tme.eu/sk/en/details/r46...acitors/kemet/.
    Is that an issue? My RLC meter shows the capacitance: 85nF.
    I'm new to ESR, so maybe this is all expected for this type of capacitor?
    Thanks
    Tags: None
    • stj
      Great Sage 齊天大聖
      • Dec 2009
      • 30952
      • Albion
      #2
      component testers dont show esr for very low caps - it's a software function.
      here is some text!
      Attached Files

        Comment

        • Per Hansson
          Super Moderator
          • Jul 2005
          • 5895
          • Sweden
          #3
          It depends on the firmware version of the tester too if it is based on the open source transistor tester project.
          For example my with latest k-firmware can test ESR of a film cap down to 47nF but a 10nF shows no ESR.
          Here from the manual that stj linked:

          The tester tries to measure the ESR for capacitors larger than 10nF.
          Alternatively you can also enable the old ESR measurement method starting
          at 180nF. But since the ESR measurement isn't done via an AC signal with a
          specific frequency, please don't expect a solid result. The method used might
          be comparable with a 1kHz test. Anyway, the results are good enough to check
          electrolytic caps. For low value film caps you could get different results
          based on the MCU clock rate. I'd guess Mr. Fourier is able to explain this.​
          That said ESR is generally not of interest for a X or Y class film capacitor, only capacitance so it doesn't really matter anyway...
          "The one who says it cannot be done should never interrupt the one who is doing it."

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