I have looked at the construction and i like it pretty much seems to have both ptc and movs and a bunch of serial resistors on the input 3 x 33m and 4 x 2.5m before the input of the ic seems pretty ok and after i saw the other side of the pcb i am pretty happy with this unit.So updated the post with more images of both sides of the pcb, and i changed the thread name as it became a teardown lol.
![]() Voltcraft Vc 960 Software Engineering Serial Resistors OnWould have been nice to see the other side of the board for further comments. It looks like a special though, the board and input terminals look different. I was planning to post a teardown of it here (already made the photos), but never got around to it and Hagis2k beat me to it. ![]() In my country Conrad nowadays sells this meter for 125,- which is in my opinion way too much. If you are a hobbyist on a tight budget (or are just a cheapskate like me) in need of a DMM and can get this one for less than 70,- Id say go for it. A Gossen 12S with half the count (3,100) has a far better performance, at 0.251 digit, instead of 0.68 digits. I couldnt find a MOV on that board, which is strange, considering the trouble they went through to make an average meter as safe as possible. Hz is also pretty limiting for a true RMS meter. Unless you get any response from Conrad or UNI-T (I wouldnt hold my breath until that happens), probably your best bet would be the datasheet I linked here before and a bit of reverse engineering to figure out what the pots in this meter do. Before you start playing with these you better have access to some kind of reference that is significantly more accurate than the stated accuracy of your meter. The VC-850 is simply not a precision instrument and it is not going to be no matter what you do with it. ![]() Compared to my Fluke 179 (stated DC volts accuracy: 0.092 digits, which is average at best but still a lot better than the VC-850), I noticed that the divergence is not uniform across the voltage range. At some voltages the indication on the VC-850 is a few counts higher than on the Fluke 179, at other voltages it is a few counts lower, and at some voltages they pretty much agree. I.e. a simple adjustment wont make those all go away.
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