Products > Test Equipment
Uni-T UT139c LCD biasing and other mods
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frozenfrogz:
Since I do not have one of those, I can not give a definite answer. However, my guess would be, that Uni-T did not opt for a different measuring IC on the updated version. There were no problems with the older models (that I know of) and completely reworking that series is not a thing that is easily done or financially justifiable. Hence, all the EEPROM modifications should work.

Someone having the E or S model would have to confirm though.
UK:

--- Quote from: frozenfrogz on December 19, 2019, 07:13:02 pm ---Since I do not have one of those, I can not give a definite answer. However, my guess would be, that Uni-T did not opt for a different measuring IC on the updated version. There were no problems with the older models (that I know of) and completely reworking that series is not a thing that is easily done or financially justifiable. Hence, all the EEPROM modifications should work.

Someone having the E or S model would have to confirm though.

--- End quote ---

Thanks for your fast response! I will definitely try to apply these hacks my new UT139E.
Hope I will not brick it ;)
Folxs:
I have question - is it possible to activate RS232 on 139C? Datasheet says it is - but which pin is going to be responsible for communication? I wanted to add IR diode like in this video: https://youtu.be/8VPsWI963p8?t=7m21s

Can anyone help?
frozenfrogz:
UART is on pins 20 / 21 of the DTM0660L as taken from: http://www.kerrywong.com/blog/wp-content/uploads/2016/04/DTM0660DataSheet.pdf
Folxs:

--- Quote from: frozenfrogz on December 20, 2019, 03:11:37 pm ---UART is on pins 20 / 21 of the DTM0660L as taken from: http://www.kerrywong.com/blog/wp-content/uploads/2016/04/DTM0660DataSheet.pdf

--- End quote ---
Are You sure 100% about that?
I have seen that, but this is two way UART - so I thought this is UART between EEPROM and DTM0660.
Does that IR RS232 is two way communication somehow? It shouldn't be only one way?
Best way to find out is to check in other multimeter based on DTM0660 and see where that IR diode resistor is connected and how.
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