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A look at the Uni-T UT210E

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joeqsmith:

--- Quote from: brainwash on July 06, 2020, 12:38:20 am ---I've ordered the Amazon demagnetizer - from a direct overseas reseller, it will take 1 month to get to me but it's not that critical.

I've designed and 3d printed this part: https://www.thingiverse.com/thing:4524771 - which I've used on the meter. It took a bit of practice on a magnetized screwdriver to get it to work. I've then adjusted the trimpot on the back. Not sure in which order it should be done, bur now I get about 100mA variation depending on meter orientation while it was only ~20mA a few months ago. I don't think the Earth has changed that much since then. That means, I get -60mA in one orientation and up to +60 or even 100mA on other orientations.

For relative measurements it's perfectly fine, but the annoying thing is that I always have to subtract that offset mentally. As soon as I zero the meter using the button, I lose the 6000 count and it reverts to 2000 counts with the "O.L." display. But it's a minor issue.

I've also slowly nulled out the meter using a magnet but was looking for something more reliable. I might resort to the transformer trick if the newly ordered demagnetizer doesn't do the job.

For other people, please see my post above about decreasing the continuity latency, it really improved on the meter's usabilitu.

--- End quote ---

I'm missing something as when you zero it, it's a software function.  Obviously if you are changing the setup after nulling, it will be a problem but it sounds like you have some offset that the software can't compensate for.   

Setting the pots are a huge pain.  They are VERY sensitive.  I have yet to have to adjust one outside of the meter I modified.  The only real problems I am seeing is the switches are failing. 

brainwash:
I've modified the firmware on the meter, one of the improvements is now that it reads up to 6000 on the 2A scale, so up to 6A. This means the milliamp resolution is kept up to 6A. Not sure how linear the response is, but I don't expect it to be unusable.
One of the limitations of the chipset is that, pressing the zero button "resets" the maximum to 2A. So you have to choose between having an absolute error and 6A range or a relative zero and 2A range.
I believe this limitation is baked into the ASIC, as there is no register to control it.

joeqsmith:
Your previous comment makes sense now.  It's been about 4 years since people were sorting out the tables and that dotless mode had a few problems.  Still, in some cases it's worth it. 

Trader:

--- Quote from: brainwash on July 06, 2020, 02:37:40 am ---I've modified the firmware on the meter, one of the improvements is now that it reads up to 6000 on the 2A scale, so up to 6A. This means the milliamp resolution is kept up to 6A. Not sure how linear the response is, but I don't expect it to be unusable.
One of the limitations of the chipset is that, pressing the zero button "resets" the maximum to 2A. So you have to choose between having an absolute error and 6A range or a relative zero and 2A range.
I believe this limitation is baked into the ASIC, as there is no register to control it.

--- End quote ---

Please, could you explain how do you did that? Thank you so much.

Trader:
$37.85 - UNI-T UT210E
https://www.aliexpress.com/item/1000007078223.html

$3.88 (Color: 2) - CH341A 24 25 Series EEPROM Flash BIOS USB Programmer Module + SOIC8 SOP8 Test Clip For EEPROM 93CXX / 25CXX / 24CXX
https://www.aliexpress.com/item/32902635911.html

Hacking to 10,000 counts

https://www.eevblog.com/forum/testgear/a-look-at-the-uni-t-ut210e/msg1423248/#msg1423248

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