Multimeter reads false overflow on the milliamp scale
First of all, thanks for all your answers and proposals. As @brhans said, something could be broken, so I checked the internal connections from the mA input. Very soon I had to remove the dial to keep following the lines (broke that too, but managed to fix it) and I got in a place where something looked kinda strange.

A very small black thingy (could be a diode) was broken and one part was at a 90 degrees angle with the other while remaining soldered. It seemed like it was soldered that way to begin with (though I remember I used to be able to measure current before, but I'm not sure I even knew how when I bought it).

I shorted where it was supposed to be and tried to measure again and this time I got a value! I soldered to keep it shorted, screwed the multimeter and it seems to be working fine now. Though I still haven't ascertain the values I measure with the theory... I'll edit when I do.

Thanks again everyone!



Edit:







simulate this circuit &ndash; Schematic created using CircuitLab

With this schematic I took some measurements, changing the R1.

Resistance - Measured Current (Theoretical Current) Scale
47k - 0.129 (0.128) 2m
10k - 0.607 (0.6) 2m
1k - 5.49 (6.0) 20m
470 - 11.42 (12.77) 20m
330 - 16.14 (18.18) 20m
165 - 1.0 (36.36) 200m
110 - 1.4 (54.55) 200m

So I can see that the 2m scale is highly accurate, then the 20m is somewhere close and then there is the 200m...



Edit2:

I remember seeing some potentiometers inside the multimeter, so I opened it once again. I tested for DC current, voltage and resistance while toying with them.

The 2 potentiometers at the bottom seemed to change nothing, so I returned them to their starting value (I hope so anyway).

The 1 at the top though, had some effect to DC current and voltage measurements. Unfortunately the effect was across every range and in anyway was more of a finetune. So I returned that too to starting value and now I'm left with accurate measurements up to 2mA, close enough up to 20mA and then I have to go to the 20A input and see up to 2 decimals...

I'm not a professional, so I can deal with that, since it's fine to help me find the current requirements of different components and the rest I can find from Ohm's law.

Cheers!