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A look at the Uni-T UT210E

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RoGeorge:

--- Quote from: radiolistener on October 24, 2021, 12:46:19 pm ----0.014 ... -0.070 Amps [DC] depends on orientation in the space
I demagnetized it last time about 2 or 3 months ago :)

--- End quote ---

Thank you, mine was way off the scale.

I did just now the self calibration described in

--- Quote from: indman on October 06, 2020, 08:17:21 am ---I recorded video of process of resetting to zero of the current indications in the DC mode at UT210E. This method allows to reduce residual indications in the mode of measurement of a direct current (DC 2A Dotless, 2A,20A,100A) without the need for EEPROM correction without the programmator. Thanks of kDnZP from a Russian-speaking forum!

ATTENTION! To do only if there is a backup copy of EEPROM!

1. To switch off device.
2. To clamp HOLD+SELECT and to switch to the "resistance, ring-up, diode, condenser" mode.
3. To see a text of "CAL", to release the HOLD+SELECT buttons
4. To wait. To wait long and not to hurry. To wait so far there will pass all self-tests until squeaks, then still to wait and wait for the moment when there are changing indications of the millivoltmeter. I.e. when the self-test will be completely passable, it will take ~ 2-3 minutes.
5. Further it is possible to switch the selector on 20A, to press the ZERO button and to nullify indications. At the same time the instrument in hand not to hold, give time for that that indications calmed down, to place the instrument where least of all el./magn. noises and the more so far away from magnets.
6. To switch the selector on 2A and to repeat the same as in point 5.
7. If necessary it is possible to modify values on other interesting ranges
8. On the end of calibration - to transfer the selector to "OFF"
9. To switch on ut201e and to check indications, if necessary - to repeat.

The link to video which explains this process.
https://yadi.sk/i/bu8eS8uF3ZfK3E

--- End quote ---

and shown in the linked Russian video (self calibration without a programmer and without opening it, only buttons pressing):
https://disk.yandex.ru/i/bu8eS8uF3ZfK3E

After self-calibrating as shown in the video, my -12.59 A DC offset was removed, but I couldn't reset it for the 100A DC range.  It can be zeroed on 2 and on 20A DC, but on 100A DC the zero only set it to 3 instead of 0.   :-//

Will try again a self-calibration after properly demagnetizing it first.

Kean:

--- 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 ---

I have three UT210E's.  DC offset on them currently is (depends on orientation)
1: 40mA to 126mA
2: 71mA to 100mA
3: -183mA to -158mA

I haven't demagnetized them recently.  I'll give that a go and see how much these change.

Ediited to add:

After demag I got the following
1: -15mA to 48mA
2: 3mA to 36mA
3: -271mA to -230mA and I can't improve it

Neutrion:
Did you try this manual calibration method?
In the long video about calibration on youtube it is also explained why this kind offset can be caused by not being calibrated well. So it is not just abut zeroing the offset, or having the correct readout values.

Neutrion:
So it seems that I have a contact problem with the selector switch. Did not use the meter too much, almost no sign of wear on the traces. Cleaned up the grease a bit, which made it a bit better, but not really perefect. Is any kind of proven method aviable to solve this? Not much info on this forum about this, so maybe I am the only one affected?

Another question is the new version which according to this topic appeared at least around 2019 with new MCU and a new Gainsil  branded op amp, which have slightly different parameters than the original TI part. So I just wonder whether anyone compared the the two versions especially in low amps modes?
Did it get different? More or less drift in the last digits?
Still switches back to the 2000 count mode after being hacked and zeroing it? (Or was it something similar...)

joeqsmith:

--- Quote from: Neutrion on January 03, 2023, 08:51:20 pm ---So it seems that I have a contact problem with the selector switch. Did not use the meter too much, almost no sign of wear on the traces. Cleaned up the grease a bit, which made it a bit better, but not really perefect. Is any kind of proven method aviable to solve this? Not much info on this forum about this, so maybe I am the only one affected?

--- End quote ---

I know several people using them and the switch failure is certainly a common problem with this particular meter.   

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