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UNI-T UT61E Multimeter teardown photos.

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mariush:
Make sure the infrared led actually works on the meter (use a digital camera or something which will show on the lcd the infrared). It should be fine.

Some of those cheap dongles use Prolific serial-to-usb chip CLONES ... the driver that windows loads detects they're clone chips or chips with the invalid prolific signature and will not work properly.

In your case, I would make sure the connectors are actually soldered properly on the pcb - the solder is often really bad on those.

Benik3:
It's strange that you didn't measured any voltage, because Logic 0 is high voltage, sou you should measure the max voltage at least on TX pin...

Nuno_pt:
Hi,

Has anyone see or try this mod for adding new functions ( http://mjlorton.com/forum/index.php?topic=285.0 ), and also this mod for external Vref from this Chinese forum ( http://forum.eepw.com.cn/thread/239953/1 ).

On another topic ( https://www.eevblog.com/forum/testgear/ut61e-drift-and-recalibration/15/ ) about the UT-61e stephenlm324 already did the external Vref mod along with replacing VR1 (2K pot) by 2 x resistors and 50Ohm pot and claims better accuracy and stability( page 2, post 18 ).

Amazing DMM.

lagman:

--- Quote from: mariush on December 24, 2013, 03:28:47 pm ---Make sure the infrared led actually works on the meter (use a digital camera or something which will show on the lcd the infrared). It should be fine.

Some of those cheap dongles use Prolific serial-to-usb chip CLONES ... the driver that windows loads detects they're clone chips or chips with the invalid prolific signature and will not work properly.

In your case, I would make sure the connectors are actually soldered properly on the pcb - the solder is often really bad on those.

--- End quote ---

Thanks for your reply. It took me a long time to test the DMM again as I was busy last week.

I checked that the IR led is working and it is blinking at about 2Hz. So I guess it works.

I tried different drivers but nothing seem to work...

I'm under Windows 7 64 bits and in device manager everything seems fine. The device is detected correctly and it created a virtual serial port (COM3). But when I try to connect to COM3 in the Uni-T software it does nothing. I also tried with UltraDMM but got the same results.

I'll now investigate the adapter itself to make sure there is no bad connection... But I'm quite desperate right now.

Thanks for your help!

lagman:
This is weird...
I got it to work, I don't know how. Then I restarted windows without touching the DMM or the serial adapter and now it doesn't work anymore.
This looks like it's either a bad solder joint (but I don't think so as I didn't touch anything) or a windows/driver problem.

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