To make thing simple I would say that if you are going to use the nana on voltage within the ranges either with an x1 or x10 probe that you should isolate the nano and make sure that you ave a full battery before you begin testing. After some conversation with my friend I found that as he was doing some testing the battery became low. He knew enough to shut of the nano and before connecting to the laptop, but forgot and maybe didn’t realize that with the ground from the probe connected that the minute he turned on the nano pow everthing went creating a ground loop. lygra and BenF are correct. This was a VFD that was spiking due to a faulty internal board. When he was testing with the nano disconnected he didn’t have an issue. It was only when the nano was grounded through the USB port on the laptop that the nano got destroyed as well as the laptop.
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