analog filtering with Labview versus electronic filtering

[akcay]

I have been into signal conditioning with LabView. I want to discuss with you guys software conditioning versus hardware coditionin, especially filterinf (i.e. bandpas filtering) an analog signal. Is there anybody out there who uses LabView for sotware conditinin and/or who compared software conditioning (implementing bandpass filter in Labview) to hardware conditioning (filter the signal electronically before data acquisition)? How satisfactory are LabView results?

Thank you guys. I am looking forward to reading your ideas.

[altenbach]

If all your signals are well within the sampling rate of your digitizer, digital filtering is OK. Analog filtering is required if the raw signal contains frequcies that are higher than the Nyquist frequency, because they would show up aliased to lower frequecies and no digital filter will later be able to differentiate them from a real frequencies.