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A look at the Uni-T UT210E

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RoGeorge:
I've just tested mine on AC current and it is completely off the scale.  Another series DMM measures 137mA  AC, while the UT210E shows zero A on AC.  If I pass the wire 4 times through the clamp it still shows 0.000 AC, on 2A scale and on 20A scale it shows 0.3A AC instead of 0.548A

Also, when it is set on DC current 2A scale it shows "0L", which I assume it means overload, so the clamp became magnetized since the last time I used it.

I should demagnetize the clamp, then try to measure again, but I have nothing to demagnetize it right now.   :-//

I'll say it's unusable when the clamp became magnetized, and it self magnetizes either by simply sitting there, or by coming nearby strong magnets or nearby very strong currents.  Even measuring a big DC current with the clamp can magnetize it.  So it kind of works, but only when demagnetized and when no magnets or ferromagnetic materials are in the vicinity of the clamp.  When well demagnetized, it can even sense the Earth magnetic field on 2A DC current.

What does your UT210E shows on 2A but DC (not AC) current when nothing is connected?

radiolistener:

--- Quote from: ThunderZed on October 23, 2021, 06:31:31 pm ---1) this clamp is not reliable enough measuring only one lead on 2A scale; 2) if looping the wire 10 times this clamp measures 20 times the real value. Consider that I asked them if this clamp will be good enough for my specific goal in my scenario. Maybe that user/forumer/buyer was just unlucky and got a "defective" ut210e?

--- End quote ---

if you look at my measurements results, it well corresponds with your photo:

0.0060 Amps => 0.003 Amps

That's ok, just because this current is too weak and close to the sensitivity limit level of UT210E, so the result on it's display may be a little distorted due to calibration and ADC non-linearity.

What is your goal?
If you want to  detect 5 mA, UT210E can do it.
If you want to measure 5 mA very precisely, UT210E can't do it (with one wire turn).
But as said above, you can add 10 turns instead one and get more precise result for a weak current.

ThunderZed:
Sorry again, maybe I'm too noob to understand these:

--- Quote from: RoGeorge on October 23, 2021, 08:17:42 pm --- I've just tested mine on AC current and it is completely off the scale.  Another series DMM measures 137mA  AC, while the UT210E shows zero A on AC.
--- End quote ---

--- Quote from: radiolistener on October 24, 2021, 03:57:30 am --- If you want to  detect 5 mA, UT210E can do it.
--- End quote ---
Aren't these statements in contradiction? Can you explain me please?

PS - I can't loop any wire due to my domestic outsets.

radiolistener:

--- Quote from: ThunderZed on October 24, 2021, 08:48:09 am ---Aren't these statements in contradiction? Can you explain me please?

--- End quote ---

I don't know what means RoGeorge when he said that his UT210E shows zero.
But UT210E can measure 137 mA AC or DC with no issue.

If it shows zero for 137 mA, then it is broken and you're needs to ask seller for replacement.

Most of all there was an actual zero current and this is why UT210E shows zero.
And his "other DMM" just is not intended to measure low current, so it shows 137 mA for zero current.  ;)


I tested my UT210E with Brymen BM867S (which is very precise DMM with 0.03% for DC and 0.3% for AC) and UT210E shows very precise measurements. The difference from 500000 count BM867S was about 1 in the last digit ;)

Here is comparison for DC current measurement on my UT210E:

RoGeorge:

--- Quote from: ThunderZed on October 24, 2021, 08:48:09 am ---Aren't these statements in contradiction? Can you explain me please?

--- End quote ---

It can detect 5mA when its clamp is de-magnetized.

However, it can get magnetized, or even self-magnetized, very easily.  Mine was magnetized.  Probably yours is magnetized, too.

So to be sure it measures correctly, you need to demagnetize it first.

Magnetized -> unusable and unreliable clamp.
Demagnetized -> great sensitive clamp, that on DC can even sense the Earth magnetic field.



LATER EDIT:
You need to do this before measuring:  https://www.eevblog.com/forum/chat/demagnetizing-a-tweezer/
https://www.eevblog.com/forum/testgear/a-look-at-the-uni-t-ut210e/msg1409125/#msg1409125

In the past I've demagnetized mine with this:

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