Signal Conditioning and Shannon Theorem

[Dibbs]

Hi, 

I need to acquire a signal and then to condition it. I am planning on using the SCX-1102 which has a lowpass filter (2Hz).

I would like to know if this lowpass filter has to respect the shannon theorem and has to be > 2*fmax.

In my case.. the fmax of my signal is 1.5Hz.

Thank you! 

[CWolf]

Hello,

I assume you are referring to the Nyquist-Shannon sampling theorem that states that the sampling frequency must be at least twice the frequency of the signal.  This applies to sampling, not low pass filters.  Just make sure you sample at a high enough rate (more than twice, 10x is better, the expected frequency of your signal - including all frequency content, even frequencies that you would like to filter out), and then the filter will eliminate frequencies above 2 Hz.  

- Christina