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  • Bench Power Supply?

    After countless years my bench PS (Sencore AC Powerite) meter needle has failed, making the unit useless. Below is a pic of the unit in the OFF state, the needle should all the way "left" at zero.

    Looking for recommendations where I can dial up AC and monitor AC and Current. Maybe a dual display.

    Watching a needle movement has become second nature to me but I wonder if a digital readout would make sense to quickly detect bad high current situations.

    Thank you.

    Click image for larger version

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  • #2
    I would carefully take the meter apart and see if it can be repaired. Often times it's just a static charge and a good cleaning will make it work. Sometimes it's a stuck/mechanical issue and a cleaning and slight bit of lube will make it work again.
    "I took a photo of my ohm meter... It didn't help." Enzo 8/20/22

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    • #3
      If you are interested in taking a shot at fixing it, I have seen newsgroup discussions in which people fixed analog meter movements. Many found a small bit of debris that was interfering with the needle movement.
      Have you tried twiddling the zero setting adjustment screw to determine if that mechanism is snagging the needle?

      Comment


      • #4
        aside from those great mechanical suggestions, it might be something simple in the needle driver circuit.

        Comment


        • #5
          https://pacifictv.ca/schematics/sencorepr57data.pdf

          its super simple!

          As to using a fancy digital meter here is a discussion on the issues : https://www.eevblog.com/forum/beginn...er-for-variac/

          Click image for larger version  Name:	sencor meter.jpg Views:	0 Size:	24.4 KB ID:	1010088
          Last edited by tedmich; 01-31-2025, 05:59 PM.

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          • #6
            Something odd is going on. Today the needle has reseated itself back to normal.

            Past couple of days it was resting below zero and I would have to tap on the panel and it would reset to zero. Also a few times yesterday it had pegged a few times when it should not, and then it was in complete failure mode.

            Today it is acting normal.

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            • #7
              Originally posted by misterc57 View Post
              Something odd is going on. Today the needle has reseated itself back to normal.
              The symptoms could indicate that there is a bit of something in the meter movement that cause the needle mechanism to jam. It's possible that it will never happen again so it could be a good idea to just keep using the instrument for now and maybe it will never happen again. That Sencore is a nice instrument and is much more advanced than just using a variable transformer with a voltage/Current meter.

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              • #8
                The old saying, when trying to fix a meter movement, it's not working, once you get done, it's never going to work now. Unless you are a jeweler, good luck.

                Comment


                • #9
                  Originally posted by mozz View Post
                  The old saying, when trying to fix a meter movement, it's not working, once you get done, it's never going to work now. Unless you are a jeweler, good luck.
                  The couple of times I have tried to do anything to a meter needle were a disaster.

                  Comment

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