How can I determine the best order to execute my butterworth filter at?

I'm low-pass filtering of a signal that has been sampled at 200 Hz through a butterworth of 40 Hz. I need determine the optimal filter order. How can I create a quantitative comparison of the effects of filter butterworth on frequencies above 40 Hz according to various order?

I tried using the FFT to create a graph in the space of the frequencies, but do not know how to proceed. Any help would be greatly appreciated. I want to compare what the path immediately before and immediately after the butterworth filter.

Also there is another way to read in a column of numbers from a text file without using reading the measurement file Express VI?

Ok

Standard of comparison filters for roll-off slope is to consider the report of the frequencies to two different attenuations.  In general, this is done to-3dB and something else by example-60 dB.  You have your data plotted in a linear way. Maybe just by looking at the f(@0.75)/f(@0.25 report) would be sufficient for your needs.  Looking at your images: order 2 f(@0.75) ~ = 38.  f(@0.25) ~ = 60. Ratio = 1.58. Ratio of the order of 10 is 39/42 = 0.93.  If you want more big numbers for best performance use inverses.

Lynn

Tags: NI Software

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