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Uni-T UT181A and calibration

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Thklinge:
I've got an UT181A and I noticed that VAC seems to be low. Compared to two other DMMs and it is massively off, showing around 206 compared to 228(!!).

Since there's no pots inside the 181A to adjust it is there a service menu or is calibration done via software hooked up to a computer? Google didn't seem to have the answer, and no service manual either.

skander36:
Hi Thklinge,
Did you manage to find a method for calibration of this multimeter ?

Thank you !

Thklinge:
Nope. Uni-T doesn't reply to emails and no one seems to know how to do it. Expensive paperweight...

joeqsmith:
I would assume it's a closed case alignment.   Too bad UNI-T wouldn't release this information but I can see their point.  Every now and then on this site, you will read someone trying to align their meter and basically wanting to return it after they mess it up.     

I ran into the same problem with Gossen when I tried to find out if their US distributors could align it or it if would have to be returned to the factory.  I was hoping they would work with some of the larger calibration labs here in the US.   

Too bad yours is out.   For what it is, I've been pretty impressed with the one I bought.   

Thklinge:
VAC is out at least. VDC is accurate, as is ohms. But yeah, shame about the VAC and that the factory sends out faulty or not calibrated meters.

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