Electronics > Beginners
Why is my oscilloscope showing a signal?
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StillTrying:
With only 2.5 samples per division and in dots mode, and going by its large amplitude for that high a frequency, is that 84MHz real or could it just be an aliasing effect. :-\

...I'm going for aliasing. :popcorn:
hermitengineer:

--- Quote from: StillTrying on November 17, 2019, 09:16:47 pm ---With only 2.5 samples per division and in dots mode, and going by its large amplitude for that high a frequency, is that 84MHz real or could it just be an aliasing effect. :-\

...I'm going for aliasing. :popcorn:

--- End quote ---

It may even be half that.  Isn't the 500Ms/s divided between the two channels?  If so, each trace gets 1.25 samples per division.  Or does the scope sample one trace on each pass and alternate between them?  I remember old analog scopes that did that.
tautech:
Change Trigger Holdoff to Close (minimum). (press the button)
Remove Ch2 probe, is the signal still there ?
If yes, then one by one turn OFF ever other thing within some meters proximity.
Wallwarts and anything running SMPS are notorious for EMI.
Careful elimination will find the culprit.
StillTrying:
What's the 84.11MHz 5Vpp signal like on 500 and 250ns/div.
hamster_nz:
Last time I had something like this it was a "Baby Monitor" on the other side of the wall, in the room next door.
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