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UNI-T UT61E Multimeter teardown photos.
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wasyoungonce:
Urggh

My UT61E is again out of calibration, see here: 
https://www.eevblog.com/forum/testgear/how-good-is-the-ut61-series/msg1214739/#msg1214739

Was measuring 12V it read around 10.2V. Its done this before.  I don't have the PCB ver and spare pads to install an LT1970 Vref...although I could do it.  But that's not the issue...it keeps going out of cal by quite a bit.  Any suggestions?  Maybe I should first change the POT I mean there is not much to go wrong here looking at the schematic.

An unreliable multimeter is useless..so I have to fix it.  Using one of my many backuo meters atm

Brendan
evgen.05:

--- Quote from: wasyoungonce on March 20, 2018, 03:05:48 am ---Urggh

My UT61E is again out of calibration, see here: 
https://www.eevblog.com/forum/testgear/how-good-is-the-ut61-series/msg1214739/#msg1214739

Was measuring 12V it read around 10.2V. Its done this before.  I don't have the PCB ver and spare pads to install an LT1970 Vref...although I could do it.  But that's not the issue...it keeps going out of cal by quite a bit.  Any suggestions?  Maybe I should first change the POT I mean there is not much to go wrong here looking at the schematic.

An unreliable multimeter is useless..so I have to fix it.  Using one of my many backuo meters atm

Brendan

--- End quote ---
Blue trimmer VR1 - is bullshit. I have the same problem. Replace and calibrate it - and calibration will never goes out.
wasyoungonce:

--- Quote from: evgen.05 on March 20, 2018, 03:31:19 am ---
Blue trimmer VR1 - is bullshit. I have the same problem. Replace and calibrate it - and calibration will never goes out.

--- End quote ---

Many thanks I'll do that and post back.

Brendan

edit:
Pot ordered.
Stinger:
Hello,

No 2018 version of UT61E with backlight ?  ???
wasyoungonce:
Ok re: my UT61E was loosing cal and was all over the place DC volts.  Put in new 2K pot adjusted roughly with variable PSU...its all appears ok time will tell.  Waiting for cheap fleabay voltage reference to arrive to cal it better.

https://www.ebay.com.au/itm/262940287208

Yes I know they are not that great but its good enough for me. :-+

I'll post back when I get it an re-cal. Thanks to all.
Brendan
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