Low-ESR analog meter

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  • frako
    Member
    • Jan 2011
    • 17
    #1

    Low-ESR analog meter

    Hello

    New year and new ESR-meter. This works much better than last year version. It is not ready yet as all power supply, protection, pcb etc. is missing. Also it is quite slow.

    http://koti.mbnet.fi/hsahko/elek/kv/mcpESR/

    Tried to draw what I have on breadboard into schematic, there may be errors in it
    Attached Files
    Last edited by frako; 01-25-2012, 11:02 AM.
    Tags: None
    • frako
      Member
      • Jan 2011
      • 17
      #2
      Re: Low-ESR analog meter

      Finally got the PCB on friday. How many mistakes there can be in one small board...

      But after some modifications it seems to be working quite ok. Some small modifications are still needed (add zero trim, change gain adjust range and I must have been half-sleeping when I put that power supply part in there)

      Test leads are connected at pads marked G+/-. This version uses two-lead measurement and runs from 9V battery
      Tested it with some caps and it gave following results. Results are at least in the right ballpark.
      Nichicon HE 1000 μF 16 V 41,3 mΩ
      Panasonic FM 470 μF 16 V 44,0 mΩ
      Panasonic FC 470 μF 25 V 72,8 mΩ
      Attached Files

        Comment

        • Agent24
          I see dead caps
          • Oct 2007
          • 4951
          • New Zealand
          #3
          Re: Low-ESR analog meter

          Looks nice.. like the purple PCB!
          "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
          -David VanHorn

            Comment

            • Th3_uN1Qu3
              Believe in
              • Jul 2010
              • 6031
              • Romania
              #4
              Re: Low-ESR analog meter

              Do you still need the relative function of the DMM with this version?
              Originally posted by PeteS in CA
              Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
              A working TV? How boring!

                Comment

                • frako
                  Member
                  • Jan 2011
                  • 17
                  #5
                  Re: Low-ESR analog meter

                  Originally posted by Agent24
                  Looks nice.. like the purple PCB!
                  They are from pcb.laen.org and that is standard color....

                  Originally posted by Th3_uN1Qu3
                  Do you still need the relative function of the DMM with this version?
                  Yes, it is still needed but the offset is only about 15 mV = about equal to test lead resistance. I think I but a trimmer for zeroing that out in next version.

                    Comment

                    • Agent24
                      I see dead caps
                      • Oct 2007
                      • 4951
                      • New Zealand
                      #6
                      Re: Low-ESR analog meter

                      Originally posted by frako
                      They are from pcb.laen.org and that is standard color....
                      Ah, most people seem to just use green, or red.
                      "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
                      -David VanHorn

                        Comment

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