Either I'm doing it wrong, or a Fluke 123 Scope meter can't show descent resolution of AC ripple on a DC line.
I set it to VAC & 5V/d. As expected, I see a nice 12VDC line with very little ripple resolution. I then increase resolution to 2V/d and the trace moves up and off screen, so I move the trace back into view. Still not a lot of AC ripple resolution at 2V/d so I try 1V/d. Now it moves off screen and I can't move the trace back into view.
So...how do you set the Fluke 123 to measure AC on the DC line with any amount of resolution?
I set it to VAC & 5V/d. As expected, I see a nice 12VDC line with very little ripple resolution. I then increase resolution to 2V/d and the trace moves up and off screen, so I move the trace back into view. Still not a lot of AC ripple resolution at 2V/d so I try 1V/d. Now it moves off screen and I can't move the trace back into view.
So...how do you set the Fluke 123 to measure AC on the DC line with any amount of resolution?
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