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Oscilloscope constant time base with varying amplitude?
W4PJB:
Is there a way to set an oscilloscope to maintain the amplitude on the zero axis while measuring in the time base? Case in point; measuring noise on a DC motor over varying voltage / amperage. I’d like to be able to increase the voltage while monitoring the noise feedback, which is the critical measurement.
Scope is an Aligent 54621A, if that matters. But this should really apply to all scopes, really.
dmulligan:
Change the input from DC to AC.
2N3055:
Only scope I know that has built in autoranging (like a multimeter) is Picoscope.
I also know that Siglent touch scopes that have DVM option, you can enable DVM on a channel and enable autoranging in DVM and it will, as a side effect, auto-range scope display for that channel.
Your scope cannot automatically auto-range..
csuhi17:
There is a description of the channel coupling in the PDF below.
You need the AC coupling to cut off the DC component and only see the AC, i.e. the noise.
Did you think of this?
My mistake, I only wanted to upload pages 122-123 :palm:
Maybe Dave's video can help you.
It's true that the video is about testing the noise of the DC power supply, but I think it can help you too.
pdenisowski:
--- Quote from: W4PJB on February 17, 2024, 04:41:11 am ---Is there a way to set an oscilloscope to maintain the amplitude on the zero axis while measuring in the time base? Case in point; measuring noise on a DC motor over varying voltage / amperage. I’d like to be able to increase the voltage while monitoring the noise feedback, which is the critical measurement.
--- End quote ---
I'm not sure I completely understand the measurement you'd like to make, but I'm wondering if XY mode might be useful here
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