Sound and Vibration toolkit for vibration analysis

Question

Hi guys! I am new to Labview. I am trying to use Sound and Vibration toolkit to analyse the accelerometer signal mounted on a motor through myRio. The analysis are spectral map, order tracking, power spectrum, order spectrum etc. But nothing can be seen from the output graph. The only result I get is from vibration level.
Attached is a screen shot of my vi and actual vi file. Am I doing it correctly? I really need your help guys....
Thanks.
Attachments:
Vib.vi ‏384 KB

Answer 1

SK,
You have serious problems in your File.VI.  Why are your writing to your file and then reading it right back?  Worse, there is no guarantee that the File write will actually occur before the File Read.  You have a race condition set up there between those two Spreadsheet File VI's.
If you want to maintain a history of whatever has already been written to the file, you should be building it into an array and storing in a shift register.  Even if your File.vi would by chance work the way you want it to, storing data in the file system is much slower than maintaining your data in memory.
As for your while loop, it is going to run as fast as it can with respect to all the functions occurring inside of it.  Is it possible you are getting 14 iterations of that while loop for each frequency step that is occurring?
Message Edited by Ravens Fan on 07-25-2009 01:35 AM