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Scope waveforms "out of sync"
Faringdon:
Hi,
How common is it in a scope, where you sample and hold 2 channels together....and they are not positioned properly with ref to each other in time...eg one is incorrectly time shifted? Is this common?
Say you have two signals, where they definitely pulse up at the same time.....but in the scope shot, they are not sync'd....because the scope is in error. Is this common?
Please also consider when say one channel is a big signal on 200x and 100V/sec, and the other channel is say 1V/div and on 20x magnification....is this error more likely then?
ataradov:
What? No, this is not common. This is not even a thing at all.
There may be some propagation delay differences between the channels, but they are not going to be significant compared to the sample rates.
Gyro:
Connect both probes to the same node and post a picture of the waveform and probes connected together. Only then can the bad workman stop blaming his tools and work out why the signals he thinks "definitely pulse up at the same time" in fact don't!
EDIT: This may be related to https://www.eevblog.com/forum/beginners/high-voltage-seen-when-scoping-with-diff-probe/ who knows.
wasedadoc:
It can happen. See around time 10:23 in https://www.youtube.com/watch?v=9cbK5o_7D6U&ab_channel=TechCornerTVElectronics%2CProjects%26Tutorials. Review of a small oscilloscope.
ataradov:
Ok, I assume we are talking about actual tools, not random junk for $20 from Aliexpress. Obviously absolutely anything can happen there.
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