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| UNI-T UT61E Multimeter teardown photos. |
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| wasyoungonce:
There are different versions with different pots ( dividor reference networks)so ensure you replace the OEM with the same specified value. |
| sonny:
--- Quote from: wasyoungonce on June 19, 2018, 11:03:59 am ---There are different versions with different pots ( dividor reference networks)so ensure you replace the OEM with the same specified value. --- End quote --- Hello, Thanks for your message. As far as I know VR1 is the same 3296X pot with 2k value for all UT61E in production (just different brands). Interesting enough in the manual says 1k for VR1. |
| joeqsmith:
--- Quote from: joeqsmith on April 09, 2017, 05:56:52 pm ---In Nov 2016, I had measured the temperature drift of my new UT61E and made a video were I compensated it. I had also changed out the one trimmer pot. Someone had asked about long term drift and I mentioned I would start collecting some data from mine. It sounds like some people are seeing a lot of drift. I can't help but wonder if this is operator or the meter. Anyway, here is some data from my UT61E after the temperature compensation taken on 11-21-16: 1mV: 1.02 1V: 1.0001 10V: 10.002 1nF: 1.003 I have had the meter apart a few times since then to make other modifications to it including the larger shunt for measuring 20A and attempting to improve the burden voltage in the uA range. However, I have been careful not to adjust the trimmers that would effect this little study. You can see the in the mV range the meter appears to have a change of 30uV. However, it's way to small of a change to hang my hat on and way too little time has passed. I would expect the meter would be fairly stable. Maybe people are using an unstable source to look at drift? --- End quote --- It's been another 6 months since I last measured the drift of my UT61E. |
| ziplock9000:
--- Quote from: escape on April 26, 2018, 12:56:29 pm ---Speaking of blow ups, I had a major brain fart yesterday... I had my UT61E in "A" position, test leads connected to COM and 10A sockets. One test lead was connected to negative terminal of a fully charged 12V car battery, and then I attempted to touch the positive battery terminal with the other test lead. I only touched the positive terminal for a split second since I saw a spark at the positive terminal and heard the DMM beep. The DMM still measures voltage, but not current on the 10A socket. Hopefully I only blew the fuse and nothing else. Is BS1362 the correct replacement fuse? I have the Chinese version, not the German version. Thanks! --- End quote --- You say German version.. Isn't it a European version because the reason it's different is due to European safety laws? |
| ProBang2:
--- Quote from: ziplock9000 on June 21, 2018, 03:21:23 am ---You say German version.. Isn't it a European version because the reason it's different is due to European safety laws? --- End quote --- Perhaps that is the case because: * It first popped up in Germany. * It seems to be like unobtanium, except from german suppliers. * It is labeled with the "GS" sign and independent tested from the german TÜV. Actually it should be even the "European Version". In Germany this version was necessary because of product liability. Regarding the european laws - let me make some examples, please: * A 9 year old boy from New York send a populated PCB to his grandpa in Berlin. The box includes the written message "Look! My first soldered PCB." - No Problem with the import to europe. It is clearly not commercial or available in higher counts. * A clever guy sells a self developed and manufactured special measurement device from Australia to europe. But sometimes the import was denied... - That is maybe because he does not marked his device with the "CE" sign. Every commercial product must be (at least) marked with this. With this sign the manufacturer assures that his product is made under consideration of the EU regulations. (Yes! That includes correct CAT ratings on DMM´s too! But remember: The manufacturer labels the products... Hence the "CE" sign is practically useless.) * Hans Schmidt from Munich ordered a CAT IV rated DMM direct from China. He used it in a CAT IV enviroment. The DMM broke down, he is now very crispy. - Because he is himself the importer of the DMM, there is no product liability involved. And there is no way to sue a manufacturer in China... * His brother, Peter, ordered the same DMM for himself. After his brother was well done and crunchy he selled his own device. Now is the buyer heavy injured by electrocution under similar circumstances as Hans. - Depending of the local laws is the importer (Peter!) legally responsible. Even as a private person. * Same case as 3, except: Hans bought the DMM from a german supplier (like Distrelec, Pollin etc.). - The supplier as the importer is full liable that the product he sells is fullfilling the claimed characteristics. Therefor he is fully legally responsible. I hope, I could made it clear. I know: Too much waffling... :blah: :blah: :blah: |
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