Signal analysis for DAQ

[Labviewuser3]

Hello,

what is the easiest way in performing signal analysis on a signal from a DAQ device?

For example if i can obtain a sine wave signal from a DAQ ,how can i program labview to give me a indication if the signal is correct ie. sine wave, ampltude, frequency, etc etc

 with the option of setting the error of eg. 3%

and also if the curve is unorthordox, can you plot points if the ideal signal, to determine and compare it to the signal obtained from the DAQ and say if it is ok ? with the option of error.

[Hillman]

Hi Labviewwuser3,

Good afternoon and I hope your well. Thanks for your post.

You have many options to analyses your signal.

The easiest is maybe an express VI called Equal, it allows you test if two waveforms are the same, greater, less and within tolerance (error).

More in depth you could use some of the VIs in the maths>> Signal processing >>Signal Operation such as peak detection. You could then compare the locations of peaks and amplitude. 

You could also do this on a point by point basses or on a complete waveform...

Hope this helps to get you started, 

Message Edited by Hillman on 12-18-2008 01:31 PM

[Labviewuser3]

Are there any tutorials available on the point by point analysis of an aquired signal?

[Dennis_Knutson]

First, you need to understand that the point-by-point functions are typically used when you acquire a single point with your acquisition - not a complete waveform - hence the name 'point-by-point'. If that is what you are doing, there are some shipping examples. Just do a search for 'point' in the example finder. Otherwise, determine what parameters of the waveform you need to measure and look at the functions on the Signal Processing>Waveform Measurements palette. On the Waveform Monitoring sub-palette, you will find some mask functions. There are shipping examples of the basic measurements and mask functions. Also look at the express VIs on the Express VIs>Signal Analysis palette. Each express VI and regular function is explained in the on-line help.