Looking for function or vi to calculate 1/2 power points of data obtained from peak detection vi

[fgowash]

I am analyzing vibration data and need a function or vi that will operate on peak data returned from the LabView Peak detection function and provides 1/2 power points or sideband frequencies. These are needed to compute a "Q" factor. So far I have not been able to find anything.

Thanks, Fran

[JLS]

Hello,

It sounds like you may simply need to search an array for values which are 1/2 the array's maximum value, or perhaps use some other algorithm to extract that data.  The idea is that, even if you don't find this functionality already implemented, you should have to tools to readily implement it!  More specifically, you may be interested in the search array function, and the array min max function.

Best Regards,

JLS

[preston_johnson]

The sound and vibration toolset may help here.  there are several vibration level measurements including peak.  With the advanced FFT functions in the Sound and Vibration tools, the zoom FFT can be used to identify and find sidebands and associated amplitudes. 

here is a link to the manual

https://www.ni.com/docs/en-US/bundle/labview-sound-and-vibration-toolkit/page/svmain/svmain.html

here is a link to the toolset

https://www.ni.com/en-us/shop/product/labview-sound-and-vibration-toolkit.html

please note the bullets on the above page (about half way down) noting peak detection, etc.