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A look at the Uni-T UT210E
Neutrion:
--- Quote from: BillyO on March 27, 2023, 02:24:25 pm ---
--- Quote from: Neutrion on January 26, 2023, 02:58:52 pm ---On the other hand: DC amp in the lower ranges are quiet good but it is linearly getting worse as I am measuring higher amps with like hundreds of mA off at the end of 20 Amp range.
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Odd. Mine actually measures low in the sub 200ma range.
--- Quote from: Neutrion on January 26, 2023, 02:58:52 pm ---DC offset is 85mA, so I don't think that it is the root cause.
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Pressing the "Zero" button should get rid of any offset. Offset could be due to magnetized jaws or a prevalent magnetic field in your area. Does changing the orientation of the meter change the offset?
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Did you try the "button calibration"?
Well, I mean't the offset is not so huge, that some nonlinearity of the sensor in higher range should cause any problem. (As it theoretically could happen when zeroing only in SW.) But don't know which hal sensor is used.
joeqsmith:
--- Quote from: Neutrion on January 06, 2023, 01:40:13 pm ---Could that be the reason, why Joe was not able to get it to an even higher frequency? How is that made with higher bandwith current scope probes?
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Back in 2016 when I attempted to hack that meter for higher BW, the goal was to see if my troll friend from Czechia would step up and show me some of their engineering skills. Seemed like a simple enough project for any EE to tackle.
https://www.eevblog.com/forum/testgear/a-look-at-the-uni-t-ut210e/msg1048470/#msg1048470
Yes, the core material was a limiting factor. Some time ago I demonstrated a simple clamp made from a standard split core that was based on the following article. Maybe you will find it useful.
http://interferencetechnology.com/the-hf-current-probe-theory-and-application/
Neutrion:
Thanks for the link.
So it seems that a simple monolith ferrit core would do it up to 1GHz. But I suppose it was not only the core which was limiting your frequency.
But I took another look at my meter now, and it seems that I was wrong. The jaw seems to be made of transformator plates, but at the part where it is openly visible, it is polished, so one has to take a loupe to be sure.
But you see it is good to know that with a bit trolling you can get motivated to do such great stuff, next time instead of arguing with you for some high voltage experiment, I will have to try this method. :)
joeqsmith:
If the meter had used better materials, yes, I could have pushed it up higher. Better jaw, MHz for sure.
When trolling the troll, I never released any details about the mods I made. After all, the goal was to show them up. While they seemed to have left the group, I figured one of the hobbyist here would at least make an attempt. It was a very low cost meter after all so there was little investment and it's not like it was a difficult project. I had some fun with it.
Neutrion:
--- Quote from: Evgeniy on April 01, 2023, 06:05:09 am ---Hi everybody.
Have a clamps UT213C, very similar in schematic with UT210.
By negligence, was measured the voltage on a high-current capacitor in a microwave. The device immediately passed out and does not turn on anymore, in all modes it writes "ErrE", if you press SELECT, then in all (except A) it writes "----".
There are no obvious burned-out elements on the board.
The first thing that came to my mind was the varistors at the input and the posistors, soldered the new varistors - it didn’t help, replaced the posistors (although when measured -+ it matches the nominal value of 15kOhm) with a resistance of 15kOhm, it also didn’t help, the protective resistor at the input, according to the measurement, matches the marking ...
I removed the EEPROM, the data is being read, but I tried to write others, when I read it again, it writes again as it was before... (maybe it's the case?)
Where to dig further, tell me, please. :-//
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I can not not help either, but only ask you: What do you think the voltage was about what you tried to measure?
Are the V sense input pins of the micro a dead short or what is the resistance?
Unfortunately as I see it, these meters do not have fast clamping diodes, so generally not so well protected, but unfortunately Joe did not do the torture test on them to know their limits.
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