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ESR meter upgrades

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    #701
    Re: ESR meter upgrades

    here is your foto of using an LM4040 inplace of the TL431
    Attached Files

    Comment

      #702
      Re: ESR meter upgrades

      stj ive noticed the last few months some more of these testers have come out i wouldnt mind a colour screen version 16 mhz which one are you recomending at the minute

      Comment

        #703
        Re: ESR meter upgrades

        there is only one colour unit as a kit / with software.

        there are 2 others sold in cases that look interesting - wait a while.

        Comment

          #704
          Re: ESR meter upgrades

          Originally posted by stj View Post
          there is only one colour unit as a kit / with software.

          there are 2 others sold in cases that look interesting - wait a while.
          Cheers will do im in no rush.

          Comment

            #705
            Re: ESR meter upgrades

            Do you know if an SCR should be possible to read on the transistor tester?
            Specifically a S2514NH. (Attached datasheet).
            It shows up just as a 15ohm resistor. (I am suspecting something is wrong with the SCR).
            Attached Files
            Last edited by Per Hansson; 10-09-2016, 11:51 AM.
            "The one who says it cannot be done should never interrupt the one who is doing it."

            Comment

              #706
              Re: ESR meter upgrades

              no idea, it may depend on gate current.

              i cant tell you that low gate current triacs can be tested - because i tried one yesterday.

              Comment

                #707
                Re: ESR meter upgrades

                Originally posted by Per Hansson View Post
                Do you know if an SCR should be possible to read on the transistor tester?
                Specifically a S2514NH. (Attached datasheet).
                It shows up just as a 15ohm resistor. (I am suspecting something is wrong with the SCR).
                That definitely sounds suspect. Check it with your multimeter. It's essentially like a BJT with an extra diode junction on the Collector.
                See SCR Construction @ Wikipedia: https://en.wikipedia.org/wiki/Silico...r#Construction

                That said, you should get an open-circuit between Anode and Cathode terminals (A and K), and a diode Vf between Gate (G) and Cathode (K).

                Good point in asking if the TT can check this component. IIRC, I remember a picture of one showing it testing a TRIAC. Don't remember about SCR, though. I don't think I have any SCRs in my junk box so can't check.
                Last edited by momaka; 10-11-2016, 09:56 PM.

                Comment

                  #708
                  Re: ESR meter upgrades

                  the test current is very limited.

                  Comment

                    #709
                    Re: ESR meter upgrades

                    Thanks Momaka!
                    Originally posted by momaka View Post
                    That said, you should get an open-circuit between Anode and Cathode terminals (A and K)
                    -I get 7MΩ

                    Originally posted by momaka View Post
                    and a diode Vf between Gate (G) and Cathode (K).
                    -I get 0.036

                    Originally posted by momaka View Post
                    Good point in asking if the TT can check this component. IIRC, I remember a picture of one showing it testing a TRIAC. Don't remember about SCR, though. I don't think I have any SCRs in my junk box so can't check.
                    I asked on eevblog too and got this reply:
                    This device is capable of recognizing Thyristors IF the gate current is <~ 5-6mA.
                    Your SCR requires minimum 20mA so cannot be recognized. Your SCR could well be OK.

                    Graham
                    I reckon it's dead, could this work as a replacement?
                    Thing sits in an electric fence controller...

                    https://www.elfa.se/en/thyristor-to-...00r/p/17201058

                    Originally posted by stj View Post
                    the test current is very limited.
                    I've seen one Chinese version with a booster circuit, I assume that would then have the possibility to measure my SCR?
                    Last edited by Per Hansson; 10-15-2016, 02:15 AM.
                    "The one who says it cannot be done should never interrupt the one who is doing it."

                    Comment

                      #710
                      Re: ESR meter upgrades

                      the booster is voltage, not current - it's for zener diodes.

                      Comment

                        #711
                        Re: ESR meter upgrades

                        Originally posted by Per Hansson View Post
                        -I get 0.036
                        That looks like a Gate to Cathode short-circuit.
                        Yup, I think it's bad. I had two big RCA 1884 SCRs from a very old HP DC power supply that were blown the same way. Also, yesterday I just pulled a TRIAC from a home food processor. Was O/C between A and K terminals with a short-circuit between the input A terminal and G . Thankfully, the IC and driving circuitry was undamaged.

                        Originally posted by Per Hansson View Post
                        I reckon it's dead, could this work as a replacement?

                        https://www.elfa.se/en/thyristor-to-...00r/p/17201058
                        Well, I am no expert on SCRs and TRIACs, but that looks about right. You got the same current and voltage ratings. The gate current on your replacement part is a little more sensitive, but I think that's a good thing, because then the controller should be able to drive it more easily (kind of like a MOSGET with a lower gate charge/capacitance).

                        Originally posted by stj View Post
                        the booster is voltage, not current - it's for zener diodes.
                        Yes, I think I remember readings something like that too.

                        Then again, all you need to test a Zener diode is a breadboard, a few resistors, and a power supply with a high enough voltage and current.

                        Comment

                          #712
                          Re: ESR meter upgrades

                          about swapping triacs.
                          one thing i learned the hard way - make sure you know if the original and replacement have an isolated tab or one linked to the center pin.

                          unless you want a live heatsink!!

                          Comment

                            #713
                            Re: ESR meter upgrades

                            A few days ago my Tester DIY Kit arrived. But without any documentation. Only the PCB and the parts.
                            My question is if someone with the same tester can take a picture of it without the LCD installed? That would help a lot.

                            And i want to ask if it is possible to protect the tester against a charged capacitor. Or better protect the tester in case i forget to discharged a capacitor.
                            That are the parts i got from ebay (the 16Mhz crystal is still in transit but the LM4040 is already here)
                            Attached Files

                            Comment

                              #714
                              Re: ESR meter upgrades

                              i dont know why a foto would help? all the part values are marked.

                              Comment

                                #715
                                Re: ESR meter upgrades

                                The assembly doc and manual are attached here.
                                Perhaps reading this thread will help you further:
                                http://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/2400/
                                Attached Files
                                Last edited by Dutch52; 10-21-2016, 03:42 AM.

                                Comment

                                  #716
                                  Re: ESR meter upgrades

                                  updates.
                                  because i'm probably moving soon due to gentrification and all my shit will be in storage!
                                  Attached Files

                                  Comment

                                    #717
                                    Re: ESR meter upgrades

                                    Originally posted by stj View Post
                                    updates.
                                    because i'm probably moving soon due to gentrification and all my shit will be in storage!
                                    Sorry to hear that stj . I absolutely hate moving myself. I hope you don't get dealt a bad card with that. Have you found a new place yet? (perhaps keep us updated in VIP.)

                                    Comment

                                      #718
                                      Re: ESR meter upgrades

                                      no idea about anything.

                                      Comment

                                        #719
                                        Re: ESR meter upgrades

                                        Thanks for the update, finally put in a 16Mhz crystal to test it, worked fine
                                        Got any firmware built for 20Mhz too?
                                        "The one who says it cannot be done should never interrupt the one who is doing it."

                                        Comment

                                          #720
                                          Re: ESR meter upgrades

                                          no, it cant do it because the delays are carefully tuned for each crystal speed.

                                          Comment

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