auto acquisition

[madd]

Hello 

i need a help in regards of spectrum acquisition i have frequency span of 50Mhz in which i can see spectrum(bell shaped/Gaussian)of 4Mhz, 8Mhz, 2Mhz . i want  to make an application which will stream to disk a spectrum when i mention the bandwidth of the spectrum (e.g i say in the span of 50Mhz i want to acquire all spectrums of 2Mhz). what is the appropriate way to do it how will i find the bandwidth's(upper and lower cut point to find the span's of 2Mhz signals)

 Regards
 Madd

[Steve_B]

Hi madd,

Your best approach to this application will be using the Spectral Measurements Toolkit because this has built in functionality that will make your analysis easier. The Basic Zoom Power Spectrum VI will allow you to get the power spectrum around a narrow bandwidth within your total signal. You would then be able to use the power spectrum to find the occupied bandwidth of your signal. I included an image that will show you the VIs I am referring to, but you can get the help file from a link below. I am not sure that you will be able to stream the results of this data to disk because of the karge amount of processing involved. The best approach for to try this would be to use a producer consumer loop to acquire the data and process the data in indepenent loops. The safest method would be to stream all of the data to disk and post process the results. 

NI Spectral Measurements Toolkit

https://www.ni.com/en/support/downloads/software-products/download.spectral-measurements-toolkit.htm...

LabVIEW Spectral Measurements Toolkit Help

https://www.ni.com/docs/en-US/bundle/370371k/page/download.html

 

Message Edited by Steve_B on 06-04-2009 06:42 PM