3 images. Cold, warmed up 15 minutes, and warmed up 15 minutes and pressed AUTO.
As you can see line is bellow center on cold, and there is more noise.
Root temperature is about 18C.
Back in August, root temperature was around 25C. Back then there wasn't such a difference and so I did not pay attention to this.
Though, what I've noticed, noise is calculated, if we drop vertical scale, noise is going to be less. In picture vertical scale is 10V, if I drop it down to 1V, V, Vpp & RMS will be lower.
Indeed, now that I began paying attention to the noise, I got scared, prior to reading this thread I thought my scope got broken (after I hooked it up to output of Baofeng UV-5R)
This is screenshot of scope warmed up & hooked up to internal wavegen, 1.000 0kHz, 1.00Vpp, square