Electronics > Beginners
this calibration 3.3 sgianl for Probe Compensation is normal ?
ammjy:
Hello, EEVBlog users,
I have a question about oscilloscope probe compensation.
Please, see the attached figure.
I didn't use this oscilloscope long time. model is OWON VDS3102.
attached figure showing that 3.3V 1kHz siganl for probe compensation.
but, as you see, before signal fall down, graph is bounce one time.
is it normal ? could you give some advice ?
tggzzz:
If you are using a standard *10 "high" impedance probe, then the flat top indicates the probe is correctly compensated.
The spike you highlight is not normal, since it looks like it occurs before the transition. I suggest you zoom in on the spike.
If it disappears then it is an artefact of the scope, possibly during post-processing after capture. If it doesn't disappear then close examination might indicate the cause.
ammjy:
--- Quote from: tggzzz on December 12, 2019, 03:48:25 pm ---If you are using a standard *10 "high" impedance probe, then the flat top indicates the probe is correctly compensated.
The spike you highlight is not normal, since it looks like it occurs before the transition. I suggest you zoom in on the spike.
If it disappears then it is an artefact of the scope, possibly during post-processing after capture. If it doesn't disappear then close examination might indicate the cause.
--- End quote ---
Thanks you for your kind help, Mr. Tggzzz.
definitely my scope has problem. and now I remember before also my scope had this problem.
both two channel has same this problem from 3.3V 1kHz square wave source.
I should think how can I solve it.
tggzzz:
What is the timebase on that screendump?
Have you considered the possibility that the calibration signal is the problem? Do you have another source with a suitable edge?
ammjy:
--- Quote from: tggzzz on December 12, 2019, 04:56:39 pm ---What is the timebase on that screendump?
Have you considered the possibility that the calibration signal is the problem? Do you have another source with a suitable edge?
--- End quote ---
time base was 50ns/div,
yes I think so too. because, both two channel showing same problem.
I have a signal generator, so I will check with it again :) as soon as capture the graph, I will upload here !
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