QUOTE (Norm Kirchner @ Jan 30 2009, 12:37 AM)
Thank you, guys, for your prompt input. You all are saying the same thing and I agree. I think that I have enough data points to satisfy the basic Nyquist criterion, which requires that the data be sampled (at least) at twice the highest frequency of interest to avoid aliasing. In my case, I am sampling at 50kS/s. The FFT function I am using is giving me by default a spectrum with a range up to 25kHz. What I want to do is to reduce my frequency range to, say, 12.5kHz. This is in fact equivalent to sampling the data at 4 times the highest frequency of interest. So, I nead help locating a function in the LV-palette labyrinth which will allow me to input something (maximum frequncy, sampling rate, number of samples, or a combination of these). That way, I inclease the resolution. I hope my question is clearer.