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

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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  1. 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

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

  3. Happy to see proper EEVBlog videos again!

  4. Fundamental friday is a great idea!

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

  6. 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…

  7. Definitely
    A Fundamentals Friday would be great.

  8. 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 🙂

  9. 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.

  10. 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)

  11. 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:

    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, the other two are Fluke brand hook tip probes. I hope this is interesting to you.

    Best regards from Hamburg/Germany,

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

    Best regards,

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

  14. I have read so many posts regarding the blogger lovers except this piece of writing is really a pleasant post, keepit up.

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