Basics Of Lissajous Patterns On An Oscilloscope




What do you think about this video?

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 ! 

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.

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

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.

Tyler Hanson: my god that was a beautiful circle

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. ;-)

Teksaur: Intriguing!

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.

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.

PraKhaR: It looks like a comet.

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 ?

Hugo Toledo: I just picked up a couple of 10Mhz oscopes for the kids to play with. Woohoo!!!

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.

Robert 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!

geckingen: cooool can you make a video explaining the RTTY-cross?

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.

Eric Haaland: Thank you for this! I'm a first year PhD student studying postural control and instability and we're learning about movements between the hips, knees, and ankles, and how they're coordinated. Many studies have used Lissajous figures as feedback for people to tell them how they're moving. This video really helped me grasp what was happening in reference to 0° and 180° measurements of relative phase between components of the body. Thank you, thank you, thank you!

Alex Camilo: Do you take requests? I would love to know what makes a "real" o-scope frontend different from one of the sub100 novelty scopes.

w2aew: If X is zero, then any input on Y will just create a vertical line

w2aew: Wow - very cool, and glad to help!

FuseBit: OK? ;)

starstruckself: so what happens when X input is zero and f becomes larger?

w2aew: Absolutely, link as many videos as you'd like.

KozmykJ: So if you put a Stereo signal into the scope instead of a Mono you'll get colour on your CRT ;^)

serginietor: Great! I did this in university last week and didn't really understand it until I saw this video. geez, you should have more views.. thanks!

Omnomnious: This is really a great video, great explanations as well. I really, really want an oscilloscope at my place but I don't know where to get one or how to get one without spending more than 150 bucks or so.

thachmonkey: Such a great instruction :D Thank you very much for the video :) It helps me a lot :)

Dave Sica: It's like the "Khan Academy" of scopes here!

Jeri Ellsworth: This takes me back. I spent hours making lissajous patterns on my homebrew oscope as a kid.

Orcinus24x5: This function is used to adjust tape heads in reel-to-reel and cassette tape decks, to get the phase between the channels perfectly aligned.

w2aew: Analog scopes do not need a trigger for a lissajous pattern. Some digital scopes do, but it still will not result in a stable display. Stable lissajous patterns only result from two signals that are synchronous and harmonically related. You may be confused the the term "trigger". It has nothing to do with a schmitt trigger. Please see my other videos on the triggering topic.

Ted Mieske: Good video tutorials! I'm thinking of adding a "Test Equipment Tutorials" to my web page. Do I have your permission to add your Video's? elecurls.tripod.com It would go under "How-Tos" page.

adoinstru: for a stable display on screen, vertical input and sweep generator output must be synchronized. Its all good, then why do we need another circuitry like "trigger circuit" and that too from specially schmitt trigger??

Mike M: got this topic on my metrology course but we lacked time to cover it properly. it looked like a fun thing to do and watch but i haven't understood it very well. this video made it clear for me. thanks

w2aew: I found that with my 2467 (non B) that the scope turns down the intensity dramatically in XY mode. It makes it look like it enabled the safety shutdown feature, but it didn't. I simply have to turn the intensity control up about 3/4.

Pasan Karunanayake: Thank you very much for the tutorial...

timma87698: Are you using any sort of trigger on this setting, or is it just a constant scan readout?

Vet: When I graduated High School, all I wanted to do was kick back and relax without having to do any homework. But I realized I have no money to do anything fun. So I went to a San Francisco Vet School to get trained to make money. But seeing your videos, I am gonna be an internet marketer on the side. Let me know if you have any tips. Thanks.
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Basics of Lissajous Patterns on an Oscilloscope
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Basics of Lissajous Patterns on an Oscilloscope