I have a UEI DMM. Model 383, I believe. It's a handheld unit. I know it's old, cheap and I should get a good meter...
I tried to use the ammeter today, and it won't give a reading. The display shows "0.00" and when it's connected to a circuit, it displays, "-0.00"
I've only just used that feature recently and it worked a week or so ago. I was playing around with a generic clamp probe and may have blown the fuse then on mains power. Anyway, I tested it using a lit LED. I got zero on all scales. There are two jacks, one for low and one for high amps (2A max and a 10A max). I tried all scales with both jacks.
I opened it up expecting the fuses to be blown. The 2A buss fuse was blown, but the 10A fuse was not. Do you think the 2A fuse could prevent the 10A jack from working? Or is 20mA too low to be sensed on the 10A jack? It shows 3 decimal places on the low scale of the 10A jack. Looks like it would register. I could try a higher current. Or, I could short out the 2A fuse to test it, but since it's my ONLY tester, and I can't really afford a new one right now, I'd rather not muck it up. Anyone got any ideas?