Yet another ESR meter!

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  • gonzo0815
    Badcaps Legend
    • Feb 2006
    • 1600

    #21
    Re: Yet another ESR meter!

    It`s simple, cells with high ESR are bad, as their voltage will break under heavy load. Here i can buy a special battery checker, which does basically the same like an ESR tester, but it does include high current discharge readings.

    Comment

    • kc8adu
      Super Moderator
      • Nov 2003
      • 8832
      • U.S.A!

      #22
      Re: Yet another ESR meter!

      i simply test a cell like a cap.
      a good one .01-.03
      bad ones are usually really bad .several ohms.
      use a new cell as a reference.

      Comment

      • willawake
        Super Modulator
        • Nov 2003
        • 8457
        • Greece

        #23
        Re: Yet another ESR meter!

        thanks guys
        capacitor lab yachtmati techmati

        Comment

        • PCBONEZ
          Grumpy Old Fart
          • Aug 2005
          • 10661
          • USA

          #24
          Re: Yet another ESR meter!

          Yes thanks.

          I think maybe I'll add a second set of test lead jacks for that.
          One set diode protected for caps and the other not for batts.
          [Easier than jerking with diodes in leads and I don't have to keep track of 'special' leads.]

          I joined this site just to learn how to fix mobo's.

          ~~ Now I'm a meter modder... whoo hoo!!

          .
          Mann-Made Global Warming.
          - We should be more concerned about the Intellectual Climate.

          -
          Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.

          - Dr Seuss
          -
          You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
          -

          Comment

          • Per Hansson
            Super Moderator
            • Jul 2005
            • 5895
            • Sweden

            #25
            Re: Yet another ESR meter!

            Nice, please post PIC's of your modded meters for us all to drool over
            "The one who says it cannot be done should never interrupt the one who is doing it."

            Comment

            • willawake
              Super Modulator
              • Nov 2003
              • 8457
              • Greece

              #26
              Re: Yet another ESR meter!



              got my blue esr kit last week. looks great. the case is very good, nice pcb and no skimping on the components, caps are nichicon and panasonic. full report soon.
              Attached Files
              capacitor lab yachtmati techmati

              Comment

              • zandrax
                Hit and miss
                • Dec 2007
                • 1157
                • Italy

                #27
                Re: Yet another ESR meter!

                Willa, didn't you review another esr meter?
                Anyway I'm waiting for.

                Zandrax
                Have an happy life.

                Comment

                • willawake
                  Super Modulator
                  • Nov 2003
                  • 8457
                  • Greece

                  #28
                  Re: Yet another ESR meter!

                  yes but i did not build that one
                  capacitor lab yachtmati techmati

                  Comment

                  • zandrax
                    Hit and miss
                    • Dec 2007
                    • 1157
                    • Italy

                    #29
                    Re: Yet another ESR meter!

                    Now I understand

                    Zandrax
                    Have an happy life.

                    Comment

                    • starfury1
                      Badcaps Legend
                      • May 2006
                      • 1256

                      #30
                      Re: Yet another ESR meter!

                      Willa did a review on the EVB pre build version with lots and lots of nice big photos
                      the EVB is Bobs design with a reworked PCB from memory
                      (dont think there was any components changes or very few)

                      Thats the latest kit for Bobs design
                      (not sure on the changes there thought)

                      Yeah willa post, lots of big photos so I can turn Blue with envy

                      Cheers
                      You step into the Road, and if you don't keep your feet, there is no knowing where you may be swept off to." Bilbo Baggins ...

                      Comment

                      • willawake
                        Super Modulator
                        • Nov 2003
                        • 8457
                        • Greece

                        #31
                        Re: Yet another ESR meter!

                        well i managed to lift a pad which i dont understand cos i was doing so careful soldering. it still looked connected but i fail the before installation of chips test.


                        early photo just to indicate where the lifted pad is

                        With IC2 and IC3 still not installed connect the supply leads to the batteries (or a 9V DC power supply), with a milliammeter in series with one of the supply leads.

                        Initially, you should not see any current being drawn. Press and hold the pushbutton switch and check that the current drawn is between 3 and 5 milliamps (the current will initially pop higher as all of the capacitors charge). If it is significantly higher or lower, start looking for assembly errors (component placement errors, missed solder joints and solder splashes).
                        well i think this means i should have one lead on the battery + and one lead on the connection of the battery + supply lead. i get 0 and when button pushed i get briefly 0.01 milliamp

                        gonna do some checking tomorrow
                        Attached Files
                        capacitor lab yachtmati techmati

                        Comment

                        • i4004
                          Badcaps Legend
                          • Oct 2006
                          • 2029

                          #32
                          Re: Yet another ESR meter!

                          what was the iron temp?
                          Last edited by i4004; 04-13-2008, 01:13 PM.

                          Comment

                          • willawake
                            Super Modulator
                            • Nov 2003
                            • 8457
                            • Greece

                            #33
                            Re: Yet another ESR meter!



                            iron temp was 350oC
                            Attached Files
                            capacitor lab yachtmati techmati

                            Comment

                            • starfury1
                              Badcaps Legend
                              • May 2006
                              • 1256

                              #34
                              Re: Yet another ESR meter!

                              DC Current measurement
                              meter alway becomes part of the circuit

                              so yes in series
                              (you effectively must brake open the circuit)

                              As in
                              multimeter on current range, positive lead to most positive point
                              This case, battery positive terminal
                              negative lead to more negative point (this case) PCB positive point
                              (battery connection)

                              So yes willa correct connection, just expended a bit on it for others

                              This test should be done at the second photo stage above...
                              before you put IC's in circuit
                              (but everything thing in place else if memory serves me)

                              I know you know what your doing with a soldering iron willa
                              so possibly a fault with pcb
                              or maybe diode was high and you put a bit of force on PCB without realizing it.

                              Amway I am a lot less incline to blame your skills or equipment
                              more so just plain bad luck

                              Yellow things a crystal ..interesting

                              Let us know what happen with the test please

                              (its very easy to miss read a resistor esp one on blue 1% 2%,
                              transistor too, easy to mix up npn and pnp in same package)
                              I made a boo boo or two with mine in construction

                              looking good willawake
                              You step into the Road, and if you don't keep your feet, there is no knowing where you may be swept off to." Bilbo Baggins ...

                              Comment

                              • willawake
                                Super Modulator
                                • Nov 2003
                                • 8457
                                • Greece

                                #35
                                Re: Yet another ESR meter!

                                Originally posted by starfury1
                                DC Current measurement
                                meter alway becomes part of the circuit

                                so yes in series
                                (you effectively must brake open the circuit)
                                uuuh.....it checks out now
                                capacitor lab yachtmati techmati

                                Comment

                                • i4004
                                  Badcaps Legend
                                  • Oct 2006
                                  • 2029

                                  #36
                                  Re: Yet another ESR meter!

                                  uh willa, but you broke the circuit open if you did it according to your description too:

                                  "well i think this means i should have one lead on the battery + and one lead on the connection of the battery + supply lead."

                                  this should mean you broke the circuit, right?
                                  hehe...as otherwise it would be one weird current measurement of putting 2 probes on same spot.

                                  to reiterate once again: to measure current, you break open the circuit and connect meter probes to 2 contacts that you've opened up this way.

                                  Comment

                                  • starfury1
                                    Badcaps Legend
                                    • May 2006
                                    • 1256

                                    #37
                                    Re: Yet another ESR meter!

                                    Thanks Willa ...
                                    (another great mis typo by me that should be)
                                    "meter always becomes"

                                    basically the meter becomes the supply cable (battery lead)
                                    (or part of it)
                                    ....in this case

                                    So great it works as should be so far

                                    looking good willawake ...looking good

                                    Cheers
                                    You step into the Road, and if you don't keep your feet, there is no knowing where you may be swept off to." Bilbo Baggins ...

                                    Comment

                                    • Krankshaft
                                      Badcaps Legend
                                      • Jan 2007
                                      • 2328
                                      • USA

                                      #38
                                      Re: Yet another ESR meter!

                                      We've all lifted traces at one time or another.

                                      I don't even use a temperature controlled iron I use a 20 watt Hakko Dash and it works for my purposes.

                                      I posted a few pics of this meter here with a little building commentary:

                                      https://www.badcaps.net/forum/showthread.php?t=4822

                                      I hope you have a fully variable power supply for setting the low battery indicator. Otherwise you will need to build the little discrete voltage regulator in the manual.
                                      Elements of the past and the future combining to make something not quite as good as either.

                                      Comment

                                      • severach
                                        Badcaps Legend
                                        • Aug 2007
                                        • 1055
                                        • USA

                                        #39
                                        Re: Yet another ESR meter!

                                        I adjusted the voltage dropout with an el-cheap variable wall wart, no expensive power supply needed. I set it to 3v, attached the 9v lead to the ESR meter, and placed the 82 ohm across as a load. 5.45v was close enough for me. Adjust fast since the 82 ohm resistor heats up quick. Don't try that with the 5.6 ohm resistor unless you have one that can dissipate the max wattage of your transformer up to 5 watts.

                                        I used a 30W Weller Therma boost and tin/lead solder to minimize the likelihood of burning traces. No RoHS for me.

                                        I left my transistors with as long as leads as would fit in the case so I could keep the heat away with a reverse tweezer. I didn't think of this when soldering in the diodes.

                                        I soldered the test resistors right into the ESR meter. One side is soldered to one test lead and the other is wrapped around the case. I can calibrate my meter any time and the resistors never get lost. You can see their little wires poking out just to the right of the 7 segment displays.

                                        >its very easy to miss read a resistor esp one on blue

                                        I measured all mine. No mistakes by me or the resistor factory.

                                        >easy to mix up npn and pnp in same package

                                        I placed all of each type at once to prevent mixups.

                                        Here's the easy way to hook your amp meter up for the test. Polarity doesn't matter with a digital meter. I get 9ma operating and 0ma off.
                                        Attached Files
                                        sig files are for morons

                                        Comment

                                        • willawake
                                          Super Modulator
                                          • Nov 2003
                                          • 8457
                                          • Greece

                                          #40
                                          Re: Yet another ESR meter!



                                          i wanna build the variable power circuit but i could not get a 3904 tranny. Of course the shop only had 3903 or 3905..... are these any good?

                                          if anyone is wondering why its taking so long to build the thing. i found out i was missing IC3. I got two pieces IC2 instead. Anatek dont mess around, i received the part via express mail EMS
                                          Attached Files
                                          capacitor lab yachtmati techmati

                                          Comment

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