I've search high and low for info on how to calibrate a UT70D multimeter, including these forums, no luck. It has been posted here before, but that was a few years ago.
Basically its an 80,000 count device, quite nice and capable of good precision and it was spot on when I first got it maybe 6 or 7 years ago (Maplin). Now the voltage readings are significantly out and I'm hoping to fix it rather than put it in my junk pile.
I've totally disassembled it and there is not a single trimmer pot in sight, confirming the schematic (found in this forum)
I emailed Uni-T but as expected no response. There is no mention of it on their website, not even as discontinued, so they have probably totally abandoned it
Maybe its done via some key sequence? Anyone have the remotest idea?
Thanks