ESR meter upgrades

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  • stj
    Great Sage 齊天大聖
    • Dec 2009
    • 30932
    • Albion

    #841
    Re: ESR meter upgrades

    maybe i will manage to do some releases by the weekend!!
    the build-rig is back together, i just need to back up the drives before i do anything else with it.

    Comment

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

      #842
      Re: ESR meter upgrades

      Just saw this on the German forum that I had missed:
      rnd D. schrieb:
      > Hallo Karl-Heinz, ich habe einen 1500uF Elko, der vom Tester je nach
      > Version als Diode mit großer Sperrkapazität angezeigt wird.

      Hallo Bernd, angeschlossene Elkos machen bei der Detektion von Dioden
      Probleme, da das Spannungsverhalten manchmal seltsam ist. Die Probleme
      kommen daher, daß Dioden über das Spannungsverhalten bei angeschlossenem
      470k und 680 Ohm Widerstand erkannt werden. Das Sperrverhalten wird
      nicht untersucht, weil auch antiparallel geschaltete Dioden erkannt
      werden sollen.
      Bei Elkos läßt sich das Problem umgehen, wenn man diese im speziellen
      Kondensator-Meßprogramm (1-||-3) untersucht. Wenn man nur Elkos
      untersucht, ist auch das ESR-Programm (C+ESR@TP1:3) brauchbar. Hier ist
      die Kapazitätsbestimmung nicht so genau, da mit sehr kleinen
      Meßspannungen gearbeitet wird. Für Elkos sollte die erzielte Genauigkeit
      aber ausreichen. Der Kapazitätsbereich ist auch etwas eingeschränkt
      (2uF-50mF). Dafür ist dieses Programm aber für eine Messung in der
      Schaltung (in circuit) brauchbar.
      Here is the same function described from the PDF manual:
      C+ESR@TP1:3 The additional function ”C+ESR@TP1:3” selects a stand-alone capacity measurement
      with ESR (Equivalent Series Resistance) measurement at the test pins TP1 and
      TP3. Capacities from 2uF up to 50mF can be measured. Because the measurement voltage is
      only about 300mV , in most cases the capacitor can be measured ”in circuit” without previous
      disassembling.
      If the POWER OFF option is selected in the Makefile, the count of measurements
      is limited to 250, but can be started immediately again. The series of measurements can
      be finished with a long key press.
      Live and learn
      "The one who says it cannot be done should never interrupt the one who is doing it."

      Comment

      • stj
        Great Sage 齊天大聖
        • Dec 2009
        • 30932
        • Albion

        #843
        Re: ESR meter upgrades

        i knew about that - it's documented in the code.
        it does not alter the fact that 90% of the time there will be something else in parallel with the cap that screws with the reading.

        Comment

        • turbochris
          New Member
          • Sep 2017
          • 9
          • USA

          #844
          Re: ESR meter upgrades

          I thought about using 2 cells but there's no off the shelf USB charge module available. The module I'm using seems like it's OK I used it on my DSO150 scope build. Will I have to recompile the firmware with a lower low battery threshold?

          Comment

          • stj
            Great Sage 齊天大聖
            • Dec 2009
            • 30932
            • Albion

            #845
            Re: ESR meter upgrades

            yes, or it will switch off as soon as it tells you the voltage.
            i wouldnt know about usb charge boards - i dont trust lithiums so i only charge them in the standalone charger.

            Comment

            • stj
              Great Sage 齊天大聖
              • Dec 2009
              • 30932
              • Albion

              #846
              Re: ESR meter upgrades

              update
              only GM328 for now - the build-box is in bits and RSYNC is doing it's thing.

              btw, as usual there is some functions not activated by default - well they are now.
              i had to drop down to 8x8 font to get everything to fit for now - until i can rip the contrast menu out again!
              Attached Files

              Comment

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

                #847
                Re: ESR meter upgrades

                As I said here I think the 8x8 font is better anyway so leave it in

                https://www.badcaps.net/forum/showpo...&postcount=767
                "The one who says it cannot be done should never interrupt the one who is doing it."

                Comment

                • stj
                  Great Sage 齊天大聖
                  • Dec 2009
                  • 30932
                  • Albion

                  #848
                  Re: ESR meter upgrades

                  the build box is now running - as a room heater!!!
                  so if anybody wants any custom builds - just ask.
                  tell me the hardware and anything "custom" needed, and i'll compile it.

                  Comment

                  • hal9008
                    New Member
                    • Nov 2017
                    • 2
                    • Brazil

                    #849
                    Re: ESR meter upgrades

                    Please stj, when possible, post a recent version for "AY-AT". Thanks.

                    Comment

                    • stj
                      Great Sage 齊天大聖
                      • Dec 2009
                      • 30932
                      • Albion

                      #850
                      Re: ESR meter upgrades

                      not tested.
                      Attached Files

                      Comment

                      • turbochris
                        New Member
                        • Sep 2017
                        • 9
                        • USA

                        #851
                        Re: ESR meter upgrades

                        if your room is still cold, please warm it up and compile one for me! AY-AT board, ST7735 display, 16 mhz and I need the low voltage cutoff set to a more li-po friendly value I guess 3.2 volts?

                        Comment

                        • stj
                          Great Sage 齊天大聖
                          • Dec 2009
                          • 30932
                          • Albion

                          #852
                          Re: ESR meter upgrades

                          o.k.

                          Comment

                          • eccerr0r
                            Solder Sloth
                            • Nov 2012
                            • 8667
                            • USA

                            #853
                            Re: ESR meter upgrades

                            Speaking of these AVRtesters, has the 16x2 LCD become deprecated or will they still work just fine with all the new features? (of course, no pretty artwork unlike on the graphic displays...)

                            Comment

                            • stj
                              Great Sage 齊天大聖
                              • Dec 2009
                              • 30932
                              • Albion

                              #854
                              Re: ESR meter upgrades

                              Originally posted by eccerr0r
                              Speaking of these AVRtesters, has the 16x2 LCD become deprecated or will they still work just fine with all the new features? (of course, no pretty artwork unlike on the graphic displays...)
                              depends on the cpu
                              you really need an atmega328p

                              if you have an atmega8 / atmega168 then you dont have enough flash memory.
                              on the bright side - they all have the same pinout - so you can upgrade the chip.
                              make sure you get it from china though, or it will cost almost as much as a new tester.

                              Comment

                              • stj
                                Great Sage 齊天大聖
                                • Dec 2009
                                • 30932
                                • Albion

                                #855
                                Re: ESR meter upgrades

                                Originally posted by turbochris
                                if your room is still cold, please warm it up and compile one for me! AY-AT board, ST7735 display, 16 mhz and I need the low voltage cutoff set to a more li-po friendly value I guess 3.2 volts?
                                i dont know, i'm pretty sure the cutoff is 3.6 for li-on

                                anyway - i made several - so no problem.
                                Attached Files

                                Comment

                                • vinceroger69
                                  Badcaps Legend
                                  • Mar 2012
                                  • 6714
                                  • uk

                                  #856
                                  Re: ESR meter upgrades

                                  Originally posted by Per Hansson
                                  Just saw this on the German forum that I had missed:


                                  Here is the same function described from the PDF manual:

                                  Live and learn
                                  per hansson is additional function ”C+ESR@TP1:3” option enabled in your version of the firmware i have just put onto my tester thanks

                                  Comment

                                  • stj
                                    Great Sage 齊天大聖
                                    • Dec 2009
                                    • 30932
                                    • Albion

                                    #857
                                    Re: ESR meter upgrades

                                    afaik it's always present if the menu is enabled.

                                    Comment

                                    • vinceroger69
                                      Badcaps Legend
                                      • Mar 2012
                                      • 6714
                                      • uk

                                      #858
                                      Re: ESR meter upgrades

                                      Originally posted by stj
                                      afaik it's always present if the menu is enabled.
                                      Thanks stj as you know i have two of these testers so going too have your version on one and per hassons on the other.

                                      Comment

                                      • eccerr0r
                                        Solder Sloth
                                        • Nov 2012
                                        • 8667
                                        • USA

                                        #859
                                        Re: ESR meter upgrades

                                        I would imagine the 16x2 LCD's would require less memory because they don't have any graphics to store! (?) Then again you can program bitmaps into them...

                                        I also hear that the mega8 and mega168 lack features like adjustable vref and thus can't do as much as the mega328 anyway, so that stuff can be compiled out, saving some flash?

                                        Comment

                                        • stj
                                          Great Sage 齊天大聖
                                          • Dec 2009
                                          • 30932
                                          • Albion

                                          #860
                                          Re: ESR meter upgrades

                                          so what chip do you have?

                                          Comment

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