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A look at the Uni-T UT210E

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radiolistener:

--- Quote from: RoGeorge on October 24, 2021, 09:12:31 am ---It can detect 5mA when its clamp is de-magnetized.

--- End quote ---

I didn't tested how magnetization affects AC current measurement, but I didn't notice any visible effect from magnetization for AC measurement.

Magnetization is a problem for DC current measurement, because it add offset.


For my AC measurement above I didn't performed demagnetization, the DC offset due to magnetization was about -0.060 Amps on 2A range.

Usually I'm trying to keep my clamp in demagnetized state, so I perform demagnetization after high current pulses through clamp (50-100 Amps). But if you don't apply high current pulse to the clamp, there is almost no magnetization and no needs for demagnetization.


--- Quote from: RoGeorge on October 24, 2021, 09:12:31 am ---Demagnetized -> great sensitive clamp, that on DC can even sense the Earth magnetic field.

--- End quote ---

Yes, you can easily use UT210E as a magnetic compass to find where is Earth's magnetic pole. It is very sensitive, so you can see effect from Earth magnetic field as a current offset change (for about ±20 mA) when you rotate UT210E in the space. :)

RoGeorge:
Apparently it self-magnetizes by itself.  I left mine demagnetized (I'm very sure about that), but it stayed in the bag with other car tools.  Maybe at some point there were some screwdrivers with magnetic heads in that bag, don't know for sure, it's been many months since I demagnetized the clamp and didn't used it since then.

Now, on 2A scale DC Amps with no wire it shows "0L", which means it is very magnetized.
Apparently this does influence the AC measurements, too, not only the DC.

Or maybe mine got defective since the last time I used it, or maybe I have a different version (the plastic on the clamp is red on mine, yours seems to be black plastic in the photo).

radiolistener:

--- Quote from: RoGeorge on October 24, 2021, 09:35:15 am ---maybe I have a different version (the plastic on the clamp is red on mine, yours seems to be black plastic in the photo).

--- End quote ---

My one is UT210E PRO :)

The difference between UT210E and UT210E PRO is that PRO version has frequency measurement mode and black color clamp. But you can enable frequency mode for usual UT210E in EEPROM settings.

Here is what inside of my UT210E PRO:

RoGeorge:
I thing mine got some problem since I used it last time.   :-\

I demagnetized it and it still doesn't work properly.  When powered on while blue and yellow buttons are kept pressed simultaneously, it displays CAL, then after about a minutes it displays "Error 0".

- When on DC current it displays about -12 ... -13A DC with nothing connected, thought I just degauss it.
- If I get a button cell size Neodinium magnet touching the clamp's jaws I can get it to show close to zero Amps or even positive DC, thought something seems very wrong, and no matter how much I try to magnetize it to compensate the -12.59 A DC bias, it doesn't magnetize enough
- so far I guess the cause is something else, and not the remnant magnetization

The EEPROM is original, never modified anything and never really used it, the DMM was just sitting in the bag with car tools, and mostly indoors.

Meanwhile, found out there is a schematic for UT210E on elektrotanya!   :D
https://elektrotanya.com/uni-t_ut210e_schematic.pdf/download.html

There is a bridge of 2 hall sensors and 2 trimpots, apparently for balancing and biasing the two Hall sensors, but before messing with them I would like to know what happened since the last time I used it.



Can you tell what offset (in DC Amps) your UT210E Pro displays before pressing zero on the DC 2A current range, and no wires, please?

radiolistener:

--- Quote from: RoGeorge on October 24, 2021, 09:35:15 am ---Apparently it self-magnetizes by itself.

--- End quote ---

I think this is not self magnetization, but Earth magnetic field change over time...


--- Quote from: RoGeorge on October 24, 2021, 12:31:50 pm ---Can you tell what offset (in DC Amps) your UT210E Pro displays before pressing zero on the DC 2A current range, and no wires, please?

--- End quote ---

-0.014 ... -0.070 Amps depends on orientation in the space

I demagnetized it last time about 2 or 3 months ago :)

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