topic Re: How would I implement an eye diagram graph in LabVIEW in LabVIEW

How would I implement an eye diagram graph in LabVIEW

Michael.Johnson — Tue, 31 May 2005 10:34:13 GMT

Hi,

I am trying to implement an eye diagram program (as from a scope) using LabVIEW... is there a way I can get the same output/display/result using any of the LabVIEW built-in graph/chart controls? Is there an eye diagram chart/graph in LabVIEW?

Re: How would I implement an eye diagram graph in LabVIEW

Mache — Tue, 31 May 2005 16:29:36 GMT

Hi Michael,

Eye Diagram is nothing but an Overlaid Graph. Lets say you are acquiring data and if you took 5 Samples of this data and plotted them on a waveform Graph. You would get 5 distinct values. If you now took the next 5 Samples and plotted them on this same graph you would get the two 5-sample instances overlaid on each other. If you plotted 100 such 5-Sample plots on the same graph you would get an Eye diagram.

I am attaching a Vi with 3 Sample Points which have been Accumulated in 2-D array, The Columns are sample Points the rows the instance when the 3 readings are taken.

How you go about creating an eye diagram depends on your Application - No of Points, No of Samples etc. Also How you are getting your data and Storing it in an Array is left to you.

FYI, The example creates 7 Eyes depicting 8 Levels.

I hope this helps.

Re: How would I implement an eye diagram graph in LabVIEW

Mache — Tue, 31 May 2005 16:30:50 GMT

Missed the Vi.. Seems like Posting Scrren has a Way to take the attachment out

Re: How would I implement an eye diagram graph in LabVIEW

unclebump — Tue, 31 May 2005 18:12:25 GMT

Can you post it as 7.0 format??

Re: How would I implement an eye diagram graph in LabVIEW

PauloM — Tue, 31 May 2005 18:20:36 GMT

Hi,

Here's Mache's vi in 7.0 format.

Cheers,
Paulo

Re: How would I implement an eye diagram graph in LabVIEW

altenbach — Tue, 31 May 2005 18:36:53 GMT

If you are planning to accumulate thousands of traces, a graph seems inefficient. You could proably modify my earlier memorygraph example for two-color mode (zero: color1, !zero :color2). (Basically it uses a fixed size array and increments cells according to the data and displays the array in an intensity graph.)

Have a look at my demo VI (MemoryGraph03.vi, LabVIEW 7.0) discussed at the end of this earlier thread. 🙂

Re: How would I implement an eye diagram graph in LabVIEW

unclebump — Tue, 31 May 2005 18:37:52 GMT

Maybe a waterfall chart would work. I can't remember where I got this vi from.

Re: How would I implement an eye diagram graph in LabVIEW

unclebump — Tue, 31 May 2005 18:45:18 GMT

Here is a Labview pdf I found with google.

http://www.ni.com/pdf/products/us/032753305101.pdf

Re: How would I implement an eye diagram graph in LabVIEW

muhsen — Mon, 08 May 2006 11:25:12 GMT

Hi Michael,
did you mange get the eye diagram in your labview.

if it works with you, and you got the eye diagram on the labview, could you please help me. becasue i still didnt manage to get the eye diagram in labview.

cheers
muhsen

Re: How would I implement an eye diagram graph in LabVIEW

Seamus_C — Thu, 11 May 2006 13:06:36 GMT

Hi Muhsen,

What problem are you experiencing when trying to run this vo on your copy of LabVIEW? What version of LabVIEW have you?

Post back if you are still having difficulty.

Rgds,

Seamus C

Re: How would I implement an eye diagram graph in LabVIEW

muhsen — Fri, 12 May 2006 01:14:35 GMT

Hi Seamus C,
Thank you very much for your concern.
I’m using labview 7.
So far i didn’t mange to get the eye diagram on my Labview.
i have tried to link the previous recommended VI files (EyeExample.vi, or MemoryGraph03.vi) but it seems im not link them to my VI file properly or i have missed something.

Please let me know if you have any idea or if you can help me.
Regards
muhsen

Re: How would I implement an eye diagram graph in LabVIEW

Seamus_C — Fri, 09 Jun 2006 14:20:24 GMT

Hi muhsen

I have attached a copy of EyeExample again. You should be able to open it now. To open MemoryGraph you will need at least LabVIEW 7.1.

If you still cannot oen this let me know,

Rgds,
Seamus

Re: How would I implement an eye diagram graph in LabVIEW

muhsen — Sat, 10 Jun 2006 12:44:29 GMT

hi Seamus,
thank you very much for the file. the problem is how can i link this file to my vi file.
Looking forward to hearing from you
muhsen

Re: How would I implement an eye diagram graph in LabVIEW

Seamus_C — Mon, 12 Jun 2006 12:54:04 GMT

Hi Muhsen,

To call this VI from your program, you will have to set up this VI as a subvi. Please follow the following links to see how to create a subvi.

Also see attached the example. Your eye example being called as a subvi.

http://zone.ni.com/reference/en-XX/help/371361A-01/lvconcepts/creating_subvis/

http://zone.ni.com/reference/en-XX/help/lv/71/lvhelp/Opening_SubVI_Front_Panels/

Rgds,

Seamus