Hi,
First of all, forgive my English, i'm not a native speaker.
I'm starting to play with electronics (mostly arduino stuff) as a hobby, and i have an UT61E, bought a couple of years ago that just started reading lower voltage values.
I almost have no free time nowadays, so since i bought it i must have used it no more than 50 times or so. It justs sits on my bench.
Recently, i was building another variable power supply and the 61E was reading about half volt lower than the 5 volts the PSU was outputting. I thought that the PSU was falty, but the next day i tried my old, cheap multimeter and the PSU was spot on.
Since then i did more tests (with a new battery, other multimeters and a chinese voltage reference) and the 61E was the problem.
The problem also occur when measuring AC voltages, what supposed to be 126V was reading 106V.
I read about calibrating it and i did. It needed only a tiny movement on VR1 to fix DC and AC measurings (i did not try the rest of it's functions).
For a few moments it was right again, but the next morning the error showed up again, and that's about the same offset as before.
Does anyone knows what i should do to fix it?
I read about checking the resistor array or replacing the voltage reference, but could not find anything i could follow.
Thank you all in advance.
Daniel