| Electronics > Beginners |
| Need help Understanding Oscope vs Multimeter Readings |
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| skinny:
--- Quote from: Brumby on May 30, 2018, 02:40:16 am ---Here it is ... flapping in the breeze and no other connection visible on the scope. --- End quote --- Corrected the issue with the hanging lead and got the same response. Did this for both a battery and the DC power supply voltage source. |
| alsetalokin4017:
I think that the vertical jitter is because the probe isn't grounded and you are picking up the usual 60Hz from the powerlines. Ground the probe to the negative power rail of the circuit and this should stabilize. The other thing: Please change the timebase to display only one cycle, so we can see just where on the upward slope of the pulse the scope is triggering. This may reveal more information for us to mull over. |
| Brumby:
While we're on the subject, ground connections for battery operated projects are usually quite straightforward. Same thing for isolated bench supplies ... but it is always good to have seen this video of Dave's - especially on gear that has its own power supply... |
| Brumby:
--- Quote from: skinny on May 30, 2018, 02:43:32 am --- --- Quote from: Brumby on May 30, 2018, 02:40:16 am ---Here it is ... flapping in the breeze and no other connection visible on the scope. --- End quote --- Corrected the issue with the hanging lead and got the same response. Did this for both a battery and the DC power supply voltage source. --- End quote --- * scratches head * ... and the coupling has been set back to DC on the scope? |
| Brumby:
What about the power rails on the left? Are they connected? I briefly saw something red in the bottom left corner of the video when you first turned towards the breadboard, but I have no idea if the second set of power rails are actually connected... |
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