Hello all I recently bought an oscilloscope from Saelig the DS8102 with 100MHz bandwidth and 2GSa/s but I think I am beginning to run into a problem but I am still unsure if it is operator error or something wrong with the scope. First let me say that when I use the scope's test point which is a 5Vpp square wave at 5kHz the scope measures it perfect. (Here is the part which may seem childish) When I was playing around with the probe I noticed that is was giving me a perfect (well almost perfect) sine wave at 60 Hz at nearly 12Vpp when touching the probe and when I plug in a DC power supply into the same outlet it jumps up to nearly 18 Vpp even when the power supply is off. What I am thinking is that there may be an issue with the outlet itself and not my scope. I hope I am not overlooking something stupid but that is why I come to you all to maybe show me error in my ways.