#141: What is an Eye Pattern on an Oscilloscope - A Tutorial

This video describes the basic concept behind eye patterns on an oscilloscope and how they can be used to evaluate the quality and signal integrity of a serial bit stream or data stream. It discusses how signal impairments such as jitter, ringing, overshoot, undershoot, noise, etc. can all be evaluated on a serial bit stream using an eye pattern.

[Thinks-First]

Well explained as usual. Thanks, Alan. You are a Youtube treasure.

[PankajKumar-zrtv]

This is the best explanation on Earth. Learning by doing is really a thing!

[pyrokinetikrlz]

Great video. I am an electronic engineer for 8 years and this is the best explanation for an eye diagram so far

[lincolnkarim]

What you taught in 10 minutes took me ten years to learn on my own. Until now, I harbored the notion that NRZI had something to do with the uniformed arrangement of the bitstream.

[lustrias]

This video really helped me out on understanding the eye. A very nice way of building up the information. Thank you!

[jcims]

I started taking a passive interest in DSP and signal processing about two years ago, when I picked up my first RTL-based sdr and started decoding trunked radio and other digital modes.  I've seen many of these eye charts and constellations since then but nobody ever takes the time to explain how they work, which i can understand, but it can be frustrating.

So thank you for putting together a simple and extremely clear explanation of these figures and how they are useful.  

[Vexown]

Incredible explanation, shown on a real example - just what I needed, thank you!

[Jibaren]

I read a couple of articles explaining the eye pattern, but none of them is as clear as yours, thanks a lot

[mariekeniesten]

Thank you for this great explanation. You are now referenced in my graduation paper!

[snan]

This explanation is great! I'm not speaking english natively and you have explained this better than my electrronic proffessors in my native language years ago. Thank you : )

[aitelhajreda]

great video, reading about eye pattern is nothing compared when you see real experiment with great explanations. thanks

[MagnumCarta]

Dude, this was super awesome and resourceful! I am learning about eye diagrams for PCIe retimers. Your explanations help really narrow down what they speak about with signal loss.

[bobbetts]

Excellent. As a novice I found your video the best explanation of the eye pattern on the oscilloscope. Thanks for posting it.

[santhoshk]

U r d best, , , I searched a lot, , , many websites, for complete setup, to take reference for testing my board, u r d only one who showed complete setup

[ronaldlijs]

As ALWAYS, EXCELLENTLY explained, I myself never knew about the eye pattern, having worked with serial interfaces, anyway as usual THANKS and keep them coming!

[orbita]

Wow what a great explanation, shame i graduated before finding your videos.

[htify]

Thank you very much Sir. Your video helped me to reproduce the eye pattern at different frequencies for my presentation.

[ManWrenching]

Incredibly educational video. Much appreciated.

[juliatruchsess]

Very clear and concise explanation, thanks.

[BerettaDan]

Alan, I always enjoy your videos, but I really enjoy the ones where you repair a transceiver or other piece of ham electronics. Keep up the nice work!