Electronics > Beginners

Why can't I see bouncing of switch on oscilloscope screen?

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denizoguz:
I'm trying to view bouncing of a simple switch on the oscilloscope. I have prepared a simple breadboard circuit (power->switch->resistor->ground). The problem is, it is displayed as perfect square/rectangle on the scope. I have attached a photo of scope screen and circuit. Please help me to identify why I can't catch bouncing of the switch on the scope. I don't think it this is a non-bouncing switch. As you can see it is rising 0 to 9v within 150uSec and staying there. I have tried a few different switches. Resistor in the picture is 220ohm 0.5w resistor.

denizoguz:
Sorry, I forgot to include other attachments. Here they are.

Gyro:
Are you sure you are triggering on the switch closing - they sometimes open cleanly but always bounce on close. Try triggering on the falling edge.


P.S. Welcome to the forum.  :)

Nerull:
Are you capturing on a slow timebase and then zooming in? That nice slow linear transition between 0 and 9V indicates a lack of sample points between them. It's drawing a smoothed approximation.

denizoguz:

--- Quote from: denizoguz on April 05, 2019, 08:10:52 pm ---I'm trying to view bouncing of a simple switch on the oscilloscope. I have prepared a simple breadboard circuit (power->switch->resistor->ground). The problem is, it is displayed as perfect square/rectangle on the scope. I have attached a photo of scope screen and circuit. Please help me to identify why I can't catch bouncing of the switch on the scope. I don't think it this is a non-bouncing switch. As you can see it is rising 0 to 9v within 150uSec and staying there. I have tried a few different switches. Resistor in the picture is 220ohm 0.5w resistor.


--- End quote ---

Yes. I have just learned zooming in and capturing is different than capturing first and zooming after. I'm having difficulty to capture when I zoom on time scale. I can set my scopes trigger to capture on rising edge and it is doing it but when I do it is stopping recording immediately. That is I can't see what happens after rising edge. It just stops.

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