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Oscilloscope constant time base with varying amplitude?

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W4PJB:
Thanks for all of your replies! Sorry I'm so late getting back to this; I thought I had set e-mail notifications but I don't recall ever seeing one.

I'm traveling so it will be some time before I can get back to the bench, but this is some great brain-food in the meantime!

W4PJB:

--- Quote from: ebastler on February 18, 2024, 07:20:46 am ---So far, we have three very different interpretations of the OP's question. ("You want AC coupling", "You want auto-ranging, but that is not commonly available", "You want XY mode".) Maybe it's time for the OP to clarify?

--- End quote ---

I'd like to be able to raise the voltage on my adjustable power supply while keeping the signal centered vertically on the screen, so I can watch the noise signal change over various RPM. At low enough voltage division to see the noise signal, a small rise in voltage causes the trace to fly off the screen and I have to bring it back down using the vertical alignment.

I'd like the trace to stay on the 0 line of the Y axis regardless of amplitude. Thanks, I hope this makes more sense!

ebastler:
Thanks for the clarification. Setting the scope's input to "AC coupling" should do what you need then. It will remove the DC component and only pass the AC part, i.e. the noise.

W4PJB:

--- Quote from: ebastler on February 22, 2024, 02:51:09 pm ---Thanks for the clarification. Setting the scope's input to "AC coupling" should do what you need then. It will remove the DC component and only pass the AC part, i.e. the noise.

--- End quote ---

Thanks! Still very much learning this!

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