Hi
I am having trouble analysing Power Spectrum and Power Spectrum Density. I am measuring signals from a channel from which I need to get the sq.Vrms values which is obtained by intergrating the area under the curve of a Lorentzian Peak from the Power Spectrum. I tried using both Power Spectrum and Power Spectrum density from the Express VIs. However as I increase the sampling rate from say 5000 samples to 20000 samples at 50KHz, the area under the resonance peak at roughly 15kHz keeps decreasing leading to a different value everytime I change the sampling rate. Is there an explanation to this ? I kept all the other factors like number of averages etc constant.
Would really appreciate the help
Thanks
