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  • EEVblog #468 – Uni-T UT513 Insulation Resistance Meter Teardown

    Posted on May 8th, 2013 EEVblog 16 comments


    Teardown Tuesday.
    Inside the Uni-T UT513 5KV Insulation Resistance meter.
    And what happens when you apply 5KV across the range switch of a cheap arse multimeter?
    10KV Relay datasheet

    Forum Topic HERE

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    • Jalal Uddin

      Hi David,

      I am new to the electronic market and current started repairing laptop motherboard. Can you please recommend best oscilloscope and in-circuit tester (surface mounted capacitors, etc)? Also with UK plug (3 pin), while testing the laptop motherboard it is connected to the mains via 19v dc adaptors. Could this damaged short out the oscilloscope/motherboard and do I need a isolation transformer?

      Your help would be much appreciated.

      Kind regards
      Jalal

      • Bern

        Oh dear.

      • Adam

        Jalal Uddin – I suggest you ask this on the forum and not specifically directed at David. You will likely get an answer.

    • n2o_skillz

      Fundamental friday NICE!!! Definetly would like little bit more theory on the blog.

      • Jonas

        Indeed, me too. Dave please, make this a thing.

    • Jonas

      Happy to see proper EEVBlog videos again!

    • Ondre

      Fundamental friday is a great idea!

    • c-prog

      I’m fairly sure that 8051 chip isn’t from a generic Chinese manufacturer, but is a Silicon Labs part.

    • Worf

      Yes, please have fundamental fridays.

      It’s good to get back to the basic theory now and again.

      Also – who makes an emergency stop button like that? I mean, it should be big, red, and plainly obvious…

    • dentaku

      Definitely
      A Fundamentals Friday would be great.

    • tchicago

      Looks like some EMI or power rail noise causes the MCU to crash. If I purchased this device myself, I’d return it right away. That tiny sticky thing on top of 8051 clearly isn’t enough :)

    • tchicago

      It would be interesting to see the fundamentals video about the voltage multipliers. But not only the whiteboard stuff, the real oscillograms would really be helpful as these things in real life are quite different from the simplified theory. I think it is possible to model this at the low voltages. Get signal generator at 10V p-p, and feed it to the multiplying chain on a breadboard.

    • Phil Tirino

      Thumbs up to Fundamental Friday. I’m somebody with no formal EE training whatsoever, just a math degree, and I have already learned a lot from you. I teach precalc and calc in HS and one day I brought in my Rigol scope, multimeter, korad supply and used my smartphone for a hack of a function generator. I breadboarded an active low pass filter and had my students calculate the cut off frequencies for different valued capacitors and check them experimentaly. The kids loved it. Hands on learning is the way to go. If you start doing stuff like that on your blog (maybe stuff that’s a little more advanced for your audience), that’d be freakin awesome! (Not to say that what you’ve done already isn’t awesome, but really, it’d be cool)

    • Martin

      Hi Dave,

      thank you very much for this teardown video. I’ve purchased a UT511 some months ago but never take it apart (shame on me) until today, so here’s the result:

      http://abload.de/image.php?img=uni-t_ut511_board_001e2uet.jpg

      http://abload.de/image.php?img=uni-t_ut511_board_002p7uek.jpg

      http://abload.de/image.php?img=uni-t_mod-probes6wu66.jpg

      I’ve modified this nasty alligator clips, which will be a mess cause of the shielding of the red cable and to find the proper right size plugs to ensure safety. I’ve additional covered the the plugs with heat shrink tubing and purchased two probes from http://www.multi-contact.com, the other two are Fluke brand hook tip probes. I hope this is interesting to you.

      Best regards from Hamburg/Germany,
      Martin

    • Martin

      … and by the way: “Fundamental Friday” is a very brilliant idea, THUMBS UP!!!

      Best regards,
      Martin

    • / Larry Wince

      The only service that I have ever used that didn’t get my youtube video flagged was youtubeviewseller.