#48: Basics Of Lissajous Patterns On An Oscilloscope




What do you think about this video?

Kalkaekie: Very interesting !

Tenzin Kunsang: This one's really difficult to understand. ugh!

MrJohhhnnnyyy: Thanks for great educational video! I found the fact that pattern will move if there is phase shift very useful. Because now I can tell if there is phase shift or not with my single channel scope.

neters panic: The famous 465 Tektronih I have had in y-1978/79 it was 5600 USA $. really I loved him..... 

Jerome Tech: Lissajous pattern was heavily used in older microwave line of site microwave as a test patern also called a EYE Pattern. M/w would demodulated a recieve carrier to a intermediate frequency (lower frequency) from that demodulation productions you would get two sigals oftens called the I and Q.out of phase from each other. Once they are combimed you get the eye pattern indicator on the euipment...then you know your frequency is set correctly and in phase. Sorry....trying working on this stuff at 3am in a snow blizzard. lol

mike samaki: cool! thanks!

Micheal Double: Holy smokes that's too cool. I had no idea what that butting was for. Only that it always made a diagonal line. Thank you

roy douce: At college we used to feed 50 hertz in one input and run the time base at 15625 hz then feed a video signal in the z input at the rear of the scope to funky inverted tv picture amazing what you can do with scopes.

Admiral Quality: You mean monaural, not monochromatic (which means one color).

방석재: I performed same experiment as this one did but my phase difference is not uniform. Which means my Lissajous patterns on the oscilloscope was not stayed the same as this one did. Is this because of performance difference of the function generator? or something else

therealnightwriter: Another very good vid!

Jerome Tech: so these patterns are used as a quick glance that your euipment is in phase and frequency: thats the practical application. And some equipment has its on phas shift detector and indicator where you don't need a scope

Meera Makewar: how to adjust phase in this..? will any one explain.

Elvis brkič: This is very educational video, tnx for sharing!

BobWa43: Great video. Thanks

Daniel Lybaert: Thank You very match ! Reading 5 ore 10 books don't help me as match as Your educational video's. The governments better pay You for the teachings that You share with the public. It's also very economic because we don't have to move to schools ! 

Varianna12: Good--instructive.

Joseph Cella: :P

zoolkhan: another excellent lesson i was able to copy on my really old fleamarket oszilloscope... 

Tyler Hanson: my god that was a beautiful circle

Paul N: Thank you for the time you dedicate in preparing this tutorial..I found it very useful.They make me come back in my mind all the electronics i've learned when i was young... Thank you again.

caravanken1: I am very new to scopes and your wonderful presentation helps me become familiar with the scope and SigGen controls and what they do. I am a ham also and I want to get my Extra but did not want to just bone up on the Q & A's. So, I am opening a new hobby for me into electronics. Thanks for the tutorials and keep them coming.

g0fvt: As I child I found it was fun creating lissajous figures on an oscilloscope, in adult life they were a superb way to observe frequency errors. One such application was adjusting 5Mhz crystal oscillators used as equipment master oscillators to correlate with the 10Mhz output of a rubidium frequency standard. Although the rubidium standard could be used to clock a frequency counter it becomes tiresome using a counter with a 100s or 1000s gate time in order to achieve the necessary resolution. An excellent video once again.

Islam Negm: #Lissajou_curve دلوقتى علشان تفهموا بالضبط يعنى ايه Lissajou curve شوفوا الفيديو دا :) Basics of Lissajous Patterns on an Oscilloscope و العبوا بالأوسلسكوب فى الرابط دا http://www.magnet.fsu.edu/education/tutorials/java/lissajous

handsupbud: How can these patterns help us in trouble shooting or is it that it's just understanding why they occur? I'm unsure of their purpose.

PraKhaR: It looks like a comet.

Teksaur: Intriguing!

Sandeep Kapoor: You know what, you just told me how to make a rotating magnetic field by using 2 signals out of phase by 90 degrees. Thanks for sharing. 

Matheus Moreira: Okay?!

TheKelikat: нифига не понял ничё нового лак и ладно

JoeGancher: I am writing an exam in a week that asks to determine the unknown frequency, using XY mode and counting the nodes. They talk about horizontal and vertical loops. I don't quite understand as I don't see any horizontal loops in this vid. Also, if one has a scope why on earth would they measure frequency this way instead of the traditional cm X time base of 1 cycle ?

NinjaAdorable: Dude are you an Electronics Engineer ?? Good explanations. :D Plus you need big bucks for those gear !! 

TrickyNekro: About 5:40, if you have used a 1Hz signal you would see that 90° phase difference produces a clockwise movement but a 270° phase difference produces a counterclockwise signal! That´s a good way to understand which one is leading! Same thing happens with light and polarization plane, only some "enough" decades up in frequency. ;-)

Mark Zacharias: *ahem* ... monophonic. :-)

w2aew: You should be able to find a decent scope for $100 or less. I see them listed fairly often on Craigslist and other sites such as swap (dot) qth (dot) com, under the Test Equipment section.

orbiter8 (John): Brilliant examples and explanations. Thanks

w2aew: Yes, a Huntron uses XY mode, and is basically a more flexible version of what I show in my other video covering the Octopus Simple Component Tester using an Oscilloscope.

w2aew: No triggering. On an analog scope, XY mode is freerun.

w2aew: I'll add that to the list of future videos...

w2aew: Makes sense, good to know!

Tony T.: Thank you for this video and sharing your knowledge!

adoinstru: thanks a lot to you..really, very helpful.

Bob Darlington: Woah, I had a DuMont CRO as well. Big heavy rack mount box with banana jacks that I converted over to BNC when I was about 14. That thing was a crash course on calibration. Spend an hour warming up and calibrating to take a 15 second measurement. Can't say I miss those days!

w2aew: A single input waveform, no matter how complex, when applied to both X and Y would create a single diagonal line (indicating the signals are both in phase).

w2aew: Ooooo - good idea! I'll check it out!

ceMental: That's neat! Thanks for breaking it down for us. 73

keithostertag: Yea, I experiented with that a little but got mixed results, so I'd love to see some useful examples of using Lissajous patterns to view curves of various components. One thing I found out was that on my 465B scope channel one controls the "Y" and channel two controls the "X", opposite of many illustrations I've seen. (I think I remember that correctly...), which is OK, but a little confusing when it doesn't conform to conventional use.

w2aew: Good topic suggestion. I've added it to the list for a future video. In a nutshell though, a "proper" scope front end is very carefully designed with variable attenuators and gain stages to give very well controlled frequency and phase response, with excellent transient signal performance and predictable overload recovery - at ALL vertical scale settings. Many cheap scopes rely on scaling the signal after digitizing.

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#48: Basics of Lissajous Patterns on an Oscilloscope