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Spikes and noise on Rigol DHO814

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jim_griff:
~17µs / ~58kHz switching frequency. The same frequency, but much higher in amplitude, when putting the probe next to the power brick. It's definitely the culprit.

jim_griff:

--- Quote from: jim_griff on March 14, 2024, 04:11:21 pm ---~17µs / ~58kHz switching frequency. The same frequency, but much higher in amplitude, when putting the probe next to the power brick. It's definitely the culprit.

--- End quote ---

Here are measurements with two probes. One sitting on the desk (yellow trace), the other by the Rigol PSU brick (blue trace).

Yellow is 500µV/div; Blue is 100mV/div
EDIT:(20MHZ B/W limit.)

Fungus:

--- Quote from: jim_griff on March 14, 2024, 03:32:19 pm ---The noise is definitely coming from the Rigol PSU brick.

--- End quote ---

...or through it from a dirty mains supply.

eTobey:

--- Quote from: Fungus on March 14, 2024, 09:38:26 pm ---
--- Quote from: jim_griff on March 14, 2024, 03:32:19 pm ---The noise is definitely coming from the Rigol PSU brick.

--- End quote ---

...or through it from a dirty mains supply.

--- End quote ---

So then where in the world can this signal come from? It must be somewhere between germany and UK? Maybe its the wind turbines in the sea??  :palm:

shapirus:

--- Quote from: eTobey on March 14, 2024, 10:09:43 pm ---So then where in the world can this signal come from? It must be somewhere between germany and UK? Maybe its the wind turbines in the sea??  :palm:

--- End quote ---
Nah it must be coming from the outer space, as I'm seeing it too:



This was captured with the probe in the 10:1 switch position and the ground attachment shorted to the tip, creating a loop, lying right on top of the PSU.

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