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| Oscilloscope probe questions |
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| Sniper1:
So I know when to use ac coupling and differential probes. But what is the use case for ac coupled differential probes? Asking since besides rf stuff I can't imagine a use case where you would want ac coupling instead of dc. Maybe to reduce input capacitance a bit I can't think of anything else. Can anyone enlighten me please. Also what is the proper schematic? --- End quote --- I know that this is the simplified schematic for single ended DC and AC coupled probes For differential DC it is this: https://postimg.cc/d739NDb6 But for AC coupled differential i cant get some good schematics online and am not sure if it is something like the upper one or the lower one? https://postimg.cc/23kn01nZ The upper one sort of makes more sense since it is symmetrical input but i am not sure if it is useful IRL since it will only probe pure AC signals The lower one makes sense in the way that it uses a line as a reference then removes the DC offset from another line BUT it will distorts the thing that is probed a lot more on 1 line then the other . Can someone please explain how AC coupled differential probes work ? or direct me to some good resources? (not sure if they even exist IRL [i sort of filled the gap in the probe types....) |
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