I bought an old used analog oscilloscope last week. Our home has no ground, so my oscilloscope is not grounded and shows my high-frequency (example 16 MHz of XTAL) wave superimposed on a 50 Hz sinusoidal.
I think this happens because my scope is not grounded. How can I ground my scope when there is no ground in the home? Are there alternatives for electrical grounding?
In fact, I connect the scope's ground and signal to 2 pins of 16 MHz Arduino XTAL. I saw 16 MHz very noisy sinusoidal wave on scope, I played with trigger level so much to decrease the noise but not effected, and when I changed the time division to ms range, I saw 16 MHz sine wave ride on 50 HZ sine wave . Is it possible my scope was faulty or damaged?