1. Is it this a common design, to have the Voltage input shared with the amps input (mA, uA in this case). I'd imagine you'd easily blow the 400mA fuse if you're measuring voltage and change the dial to the A.
I have looked at several meters where they share inputs like yours. The worst ones will fuse all of the other functions with the current. So you have your meter in the mA and blow a fuse, the entire meter is dead. Not as common but I run into them. I've looked at a lot of low end meters and use one still for my garage work. I wouldn't use one in CAT III even though many claim they are fine for that environment but they have their place.
Yea this design in itself is perfectly safe/usable etc so long as it’s designed correctly. One of my most enjoyable things to do is watch BigClive continue to find lower bars for sketchy/unsafe products and watch then as he spends 3 minutes to sketch out a PCB that’s better in every way and includes the added bonus of no longer being deadly if you touch it while charging
The deadly Dalek that sent mains power through the USB port’s metal facade, and all because of a little LED light that served no purpose was connected in a way that made the whole unit unsafe ...that was one of my favorites
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