waveform distortion

[ni5640]

Hi, 

I am using ni5640r to generate an array of signal and read it out from oscilloscope. Howevery, the waveform in the oscilloscope seems getting distortion. Can somebody help to find the reason?

Thanks

Austin

[Baji]

Post your Code.

[Jordan F]

Hi,

It would be helpful to give a little more information on your signal connections, generation rate, etc.  Something to initially check out though would be the probe compensation on your scope (adjust the compensating capacitor in the probe).  The document below shows how an overcompensated or undercompensated probe can affect a signal measurement.

http://zone.ni.com/devzone/cda/tut/p/id/4721 

Also, I would recommend to post this question on the IF-RIO discussion forum also which can be found here:

http://forums.ni.com/ni/board?board.id=ifrio 

Regards,

Message Edited by Jordan F on 07-27-2009 11:47 AM

[MattBradley]

Also, what scope are you using?

[ni5640]

Hi, everyone:

Thanks for your help.

I have tuned the capacitor on the probe. I don't think it has any problem.

I am using Tektronix MSO4104.

Thanks

Austin 

[Jordan F]

Hi Austin,

What is the type of probe you are using to connect the signals?  What is the generation rate you are using for the signal?  If you slow the generation rate do you still see the same type distortion?  Any detailed information on the setup would be helpful.  

Regards,

[Coq_Rouge]

Almost every digital scope has a functions named Bandwidth limitation or something like it. If this function is activated it could perhaps cause your problem. It is a wild guess. But check it out. Also ensure you have original scope probes.

Hope it helps you out....

[ni5640]

Hi, Everyone:

I have reduced the generation rate already and also I have changed the bandwith on the scope, but seems no those problems.

I have posted my code, so may be somebody can help me to fix that error.  This problem has tracing me for a long time.

Thanks

Austin