Electronics > Beginners

oscilloscope display explanation wanted

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txx4488:
Can someone explain me how does a high speed signal is displayed in low  refresh rate of LCD  in modern oscilloscope ?

ataradov:
The signal is captured in the memory and then shown on the display. There are gaps between captures. That's why you get a characteristic like waveforms/second.

xrunner:

--- Quote from: txx4488 on December 12, 2018, 01:45:22 am ---Can someone explain me how does a high speed signal is displayed in low  refresh rate of LCD  in modern oscilloscope ?

--- End quote ---

Not quite sure exactly what you mean, but if it's set to trigger on the "high speed" signal, it's just going to display a snapshot on the screen. All the processing makes this possible given a certain bandwidth specification of the scope. If it's not triggered and the horizontal time/div is not set right, then it will look like a mess.

Maybe if that is not the answer you are looking for someone else will be along to assist you better.  :)

Edit: Oh Ataradov got to it first.

txx4488:
So what might be the time delay between signal captured and signal displayed on lcd ?

 

ataradov:

--- Quote from: txx4488 on December 12, 2018, 02:02:43 am ---So what might be the time delay between signal captured and signal displayed on lcd ?

--- End quote ---
Much faster than your eyes reaction time. But it also depends on your time scale. You can set 10 sec/div and see the signal with your eyes in real time.

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