Lissajous figures

Discussion in 'General Electronics Chat' started by 76nemo, Sep 14, 2009.

  1. 76nemo

    Thread Starter Member

    Aug 2, 2008
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    I need help.

    I made a decade box to hook up to a scope to use as a curve tracer years ago to view lissajous figures. I can NOT for the life of me remember how to set up a scope to get this. I went to using a Huntron 2700 and got spoiled by it. I haven't set my box up to a scope in years.

    Can someone help me out???

    Much thanks in advance!!!!!
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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    You have to be able to run in X - Y mode. I always drove the horizontal with a sine wave from my signal generator, and applied the other signal to the vertical. Black Sabbath or organ music looks pretty good.
     
  3. hgmjr

    Moderator

    Jan 28, 2005
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    One thing, your scope must have an X-Y trace mode. Does your target scope have this feature?

    Beenthere got there ahead of me with the same comment.

    hgmjr
     
  4. 76nemo

    Thread Starter Member

    Aug 2, 2008
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    Yes, one of my scopes does.
     
  5. beenthere

    Retired Moderator

    Apr 20, 2004
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    Use that one.
     
  6. 76nemo

    Thread Starter Member

    Aug 2, 2008
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    Everyone at my new job is clueless to lissajous figures. I got spoiled with the Huntron at my old job. I could pinpoint problems very quick with it. I still have my decade box, I can't remember how to set up the darn scope to it. I have since gone into electrical work. I haven't used one in years, my box and a scope anyhow. I really appreciate your help guys/gals!!!!!!
     
  7. 76nemo

    Thread Starter Member

    Aug 2, 2008
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    I tried that and the figures were 90 degrees off. It's an old Tek scope and I can't remember the settings.......:rolleyes:
     
  8. 76nemo

    Thread Starter Member

    Aug 2, 2008
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    Phone break, be right back......
     
  9. SgtWookie

    Expert

    Jul 17, 2007
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    If they're 90° off, just swap the X and Y inputs.
    If they're then 180° off, invert one of the channels.
     
  10. 76nemo

    Thread Starter Member

    Aug 2, 2008
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    I don't remember my old scope having XY. I have had a Fluke 123 for awhile which does not have A vs. B and I thought it could still be used with my box. I haven't worked on a bench in years without a Huntron. I feel stupid. The Fluke 867B had that function. Working in the electrical field, I never had to use it. We always pawned electronic problems off on the intstrumentation guys. Now I am stumped.
     
  11. 76nemo

    Thread Starter Member

    Aug 2, 2008
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    We have three old Tek curve tracers in storage, but I will admit, I have NO idea how to use them correctly! These are older than me!
     
  12. hgmjr

    Moderator

    Jan 28, 2005
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    Depending on how old your old scope was it may not have had automatic horizontal sweep. In that case, you had X-Y sweep by default.

    hgmjr
     
  13. 76nemo

    Thread Starter Member

    Aug 2, 2008
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  14. SgtWookie

    Expert

    Jul 17, 2007
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  15. 76nemo

    Thread Starter Member

    Aug 2, 2008
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    Back to you tomorrow. Sorry for the double post, hope it gets removed. Let me look real quick, I'll be back after snack,........
     
  16. 76nemo

    Thread Starter Member

    Aug 2, 2008
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    2201:


    [​IMG]
     
  17. BillB3857

    Senior Member

    Feb 28, 2009
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    It looks like turning the time base fully CCW will give you X/Y.
     
  18. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
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    Lissajous figures are such fun and educational little "toys." I demonstrate them as soon as soon as I introduce AC circuit theory in my classes.

    Most dual trace scopes have the capability of X-Y traces, as well as many vintage scopes. For most Tek scopes, cranking the time base to the extreme left will place you in the X-Y mode. One of the input channels is thus converted to the X channel. The 2250 series scopes had a weird button combination to get into XY mode that I have to "relearn" every time I use them, though!

    Have fun!

    Eric
     
  19. Papabravo

    Expert

    Feb 24, 2006
    10,163
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    Dark Side of the Moon is awesome as well!
     
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