I'm having a problem with my Arduino, I think I broke it when I tried to learn some things about measuring the voltage.
I plugged my Arduino board into a 12V 500 mA DC power adapter as I ussually do, then I tried to measure the voltage. I connected a wire to the 5V and a wire to the Ground in the Power PINs and set my multimeter to 200V in the DCV section. After that, I connected the red probe from multimeter to 5V wire and the black to the Ground and the value showed on the multimeter's LCD was 4.95 or something like that.
I think I've connected the multimeter for about 10-15 seconds and the red and black probe were correctly connected to the multimeter. Also, I am pretty sure that I didn't touched the 5V and GND pins together because I know that would mess up any circuit.
After that operation I think I destroyed the board because every time when I connect it to the PC or power adapter, it heats.
My questions are:
1. When I want to measure my Arduino, it's better to plug in the USB, instead of power adapter?
2. The 200V DCV was too big and that caused a short circuit on my board?
3. In the multimeter manual I read something about the red probe that should be connected to a different terminal if the current exceeds 200 mA (in some manuals the value is 100 mA), could that cause problems given that my power adapter current is 500 mA?"Plug in connector for red (positive) test lead for all voltage, resistance and current ( up to 200mA ) measurements." (from Manual)
4. Also in the multimeter manual I read that the terminal for 10 mA must be used for a maximum 10 seconds and the interval between measurements must be at least 15 minutes, but I didn't used that terminal, but it's specified that rule is for current only."Plug in connector for red (Positive) test lead for current ( between 200mA and 10A ) measurement. There is no fuse for "10A" jack. To use safely, each measurement can not last for more than 10 seconds, and the interval between each measurement must be more than 15 minutes." (from Manual)
Please provide an answer to my problem, I hope I described it in detail. I don't want to ruin another Arduino board