I am using a Compact Fieldpoint cFP-AI-100 Analog Input module to measure vehicle acceleration. The acceleration input is 0volts equals 0g and 5volts equals 1g. The maximum frequency content is under .3 Hz. Do I need to utilize a hardware antialiasing filter at the input? Thank You!
The signal that you are sampling has a very slow frequency, so reaching a sampling frequency of .6Hz (the minimum sampling frequency without aliasing should not be an issue). The FP-AI-100 has a max update rate 357Hz. However, if you feel that you may be picking up stray frequencies from noise, such as 60Hz noise from a power line, you may want to use an anti-aliasing filter. You could use a low-pass filter with a cutoff of lets say 4Hz. This would remove any kind of interference that you may be sampling on that channel.