My name is Nick. I’m a idiotic prideful 17 year old who didn’t think he needed to watch a youtube video before using his dad's oscilloscope. What makes this post more ironic is that I purchased an “oscilloscope tutor kit” which is just a PCB and tutorials to teach me how to use an oscilloscope. Where my trouble came in was it didn’t come with a power supply and it says “9V AC" on the PCB next to the barrel jack.
I found a very old AC bench power supply in my barn and checked it with a multimeter until the voltage read 9V RMS. I cut the end off of an extension cable and soldered that to a barrel jack that fit the socket. This is my first problem - I soldered the ground of the connector to the neutral wire not knowing there was a difference between neutral and ground. After that, having only used a multimeter before, I connected the ground of the oscilloscope lead directly to the grounded outer part of the barrel connector which tripped a GFCI and killed the power in my basement. Being the idiot I am, I reset the GFCI and did it again to the same result. The probe was in 10x mode if that helps at all.
Since it was only 9V RMS and I was in 10x mode on the lead, did I still harm and or destroy my dad's oscilloscope? I am very sorry for the length of this post and how basic it is but I need help.