Electronics > Beginners
Oscilloscope doubles as radio station!
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viperidae:
It doesn't take much transmission power to pick up a signal on an FM radio in the same room.
Here's a circuit that consumes ~200uW and transmits "up to 50m"
https://makezine.com/projects/make-tiny-fm-transmitter-spying/
Tomorokoshi:
Does it change if you change sample rates, memory depth, time base, number of channels, etc.?
Rerouter:
What Tomorokoshi Is trying to pin down is if its the power supply or not, Another thing could be sticking a phone or something on the front USB jack to pull some current.

If its the power supply you may be able to kill it by fitting a clip on ferrite bead near where the power cord exits the device,

If its the PLL or some sampling clock that changes when you change your time scales, see if there are any firmware updates, they may have corrected it.
xavier60:
I had a troublesome amount of hash getting into measurements with my HP 54645.
When I eventually suspected the caused being its own SMPS, I confirmed it by varying the main voltage to it and noticed a corresponding shift in time between the busts of damped oscillation that were making up the hash.
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