Signal Conditioning

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pxi 4472 as spectrum analyzer

hello, please help me out.

 

i want to use pxi 4472 card read dyanmic signal coming from vibration transducer.

i need to display 20 frequencies (less than 500Hz) that have high magnitude than other frequencies with resolution of (df)0.5Hz.

 

i used measure spectrum express vi to get the amplitude at difference frequencies,

but problem is execution time is around 2sec for resolution of 0.5Hz

 

my observation is resolution df= 1 / (no. of sample / sample rate) = sample rate/ no. of samples;

means at 0.5hz resolutions taking 2 sec

 

after execution of the program what ever output data not accurate.

 

suggest me.

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