how to generate circle in oscilloscope(cro)?

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#1 21657751 26 Feb 2011 09:57

Rasina Irfhan Rasina Irfhan

Anonymous

Post #1
21657751 26 Feb 2011 09:57

1)memory devices should not be used....
2)to generate a picture like half sun....with center full round
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#2 21657752 26 Feb 2011 16:12

Cody Miller Cody Miller

Anonymous

Post #2
21657752 26 Feb 2011 16:12

You will need to put your scope in XY mode. XY mode allows you plot channel one vs. channel two. The voltages on each channel need to be a sinusoid with a phase shift on 90 degrees relative to one another.
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#3 21657753 26 Feb 2011 19:06

Gary Crowell Gary Crowell

Anonymous

Post #3
21657753 26 Feb 2011 19:06

A circle on a scope, and other shapes, are called Lissajous Figures. This looks like a good site for an explanation:

http://www.jmargolin.com/mtest/LJfigs.htm

And Cody is correct, of course.
#4 21657754 28 Feb 2011 00:25

Joshua Bishop Joshua Bishop

Anonymous

Post #4
21657754 28 Feb 2011 00:25

Just curious if this has any practical applications. What would this be used for?
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#5 21657755 28 Feb 2011 18:57

Joe Wolin Joe Wolin

Anonymous

Post #5
21657755 28 Feb 2011 18:57

Robotics are certainly a field that requires XY and sometimes Z control.
#6 21657756 01 Mar 2011 05:52

Joshua Bishop Joshua Bishop

Anonymous

Post #6
21657756 01 Mar 2011 05:52

I'm not sure if I understand... hopefully it's just because my question wasn't clear. Is there any practical application to creating a circle on an oscilloscope? I just don't see the tie in with robotics, unless this is a control systems issue...
#7 21657757 01 Mar 2011 16:13

Joe Wolin Joe Wolin

Anonymous

Post #7
21657757 01 Mar 2011 16:13

Thanks for clarifying.

I'm thinking maybe you would use this for special analysis curves such as an IV-curve of a component, gain analysis, or some type of hysteresis curve.
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#8 21657758 05 Apr 2011 14:26

Todd Hayden Todd Hayden

Anonymous

Post #8
21657758 05 Apr 2011 14:26

The only practical application I remember from years ago in college labs is that you get a "quick visual comparison" of the signals driving the inputs. The number of lobes in the figure indate harmonics and the eccentricity indicates relative amplitudes.

It's more art than science, and I'd say it's a lost art.
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how to generate circle in oscilloscope(cro)?

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