I just got my first multimeter (TekPower TP8268) and I've been try to test it out, but I have been getting some strange readings with the current measurement. I have an AC adaptor to DC 12v and 5A. Here are the results I got across various resistor readings.
10Mohm -> 164mA -> 12.3V 10Mohm -> 173mA -> 12.3V
Here's how I hooked it up:
DC pos --- RES --- Mult-In --- Mult-Out --- DC neg /ground
I can't seem to figure out how I could have gotten these readings. If my calculations are right with Ohm's Law, 12V / 10Mohm = 12 x 10-7A (or .12 uA). I made most of these readings on a breadboard, but I have a hard time thinking it would throw the readings off this much.
I did, temporarily, switch the fuses in the multimeter, so these readings are using the u/mA range, but the 20A fuse. I don't know if that could cause the problem, but that's a possibility.
So, does anyone have any idea what might be wrong? Are there any additional tests I could do to help me figure it out?