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Uni-T UT181A and calibration

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skander36:
Yeap,  slightly offtopic .
DMM is using a rather old Cyrustek ES51997 that is used as frontend.
The CPU (STMF103) is responsible with calibration process , as on the board cannot be found any trimpot .
CEM 9979 use a Hycon DMM frontend with a TI cpu but use also a software calibration with no trimpot onboard .
I don't find yet a multimeter with the same architecture . 


skander36:
I found that BK 2712 use the same ES51977 front end but his procedure calibration doesn't seem to be useful . It said that holding MAX/MIN button on start will start calibration mode but this DMM also have a jumper that need to be set for this .

skander36:
I think I have found a door but we need the key ...
Keeping pressed F2 and F3 pres On/Off button.
And the screen with a 5 zeros appear . This can be modified with arrows to form a code . 00000 as to CEM is not working ...
I will search for key used in other uni-t dmms .

joeqsmith:

--- Quote from: skander36 on March 30, 2020, 01:05:12 pm ---
--- Quote from: joeqsmith on March 30, 2020, 12:10:43 pm ---If the switch fails after a couple of years of moderate use like what I am now seeing with the UT210E, $300 for 2-3 years of service is not a very good ratio. I would rather spend $900 and have something that will last 20 years and won't go intermittent.      Switch aside, the battery pack which is some non-standard part will eventually fail.  I have not been using mine enough to know what it's life will be.   Will the hobbyist come up with creative and solutions?  My guess is yes.  Will some of these make for unsafe conditions?  Again, my guess is yes. 

While you may see it as a good long term investment, I don't.

--- End quote ---

You make assumptions based on analogies with other models . I also have a UT 61E that has never fail. I use it every day from years. Based on your model of judgement I can assume that UT 181A will last enough to get my money back on it . Also on the reverse I will not credit Fluke 289 based on the many display fading from 87V series for ex. . 
It carry the Intertek sign so it can be an Intertek product with a higher quality than UT210E . Is about ETL certification fo US. I did not know about .
Also battery pack is an Intertek model  so it must be found somewhere . But you can use any 7.2V Li-Ion pack of similar size that can be found on the market.
Switch seem to be very good built apart from other Uni-T models .
For me 20 years is to much for a tool of such complexity (for an axle , a hammer , maybe is useful) . If it will last 5-7 years is OK. Even it will last more, his place will be in personal museum. I like new technologies , new solutions so a long life for such tools is just for brand reputation ... :)

--- End quote ---

I am not assuming anything but stating if the meter were to follow suit, it would not be very cost effective.  Worse is if it goes intermittent and I don't catch it and start to make bad choices as a result.  It's hard to put a price on that.

Have you found a battery that was a drop-in replacement?  It may be good to know where to buy it from.  Someone on this site showed some pictures of their UT181A after they "modified" it to use a different battery.

I wonder if the alignment is accessed from the serial interface port.  It would make sense that this was automated.   

skander36:
A original batery was available here : https://www.aliexpress.com/item/32962838907.html
Now is no longer available  but you can use a Li-Ion battery of your choice :
https://www.alibaba.com/product-detail/7-4v-3000mah-polymer-li-ion_62323037244.html?spm=a2700.galleryofferlist.0.0.4949783c5P3568
https://www.alibaba.com/product-detail/Wholesale-waterproof-7-4v-3000mah-li_60820035927.html?spm=a2700.galleryofferlist.0.0.4949783c5P3568
https://www.alibaba.com/product-detail/Custom-Size-Rechargeable-2S1P-lithium-lipo_60659687786.html?spm=a2700.galleryofferlist.0.0.4949783c5P3568
https://www.alibaba.com/product-detail/thin-flat-li-ion-polymer-battery_60771922913.html?spm=a2700.galleryofferlist.0.0.4949783c5P3568
That meter was not modified , it was slaughtered . I cannot even watch it .

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