Google Translation of Fred Boullot responce "to study the transfer transfer function of a filter, the best method consists with: 1/Installer the driver of instrument in LV of the generator of functions which will generate the sinusoidal signal. 2 To install the driver of instrument in LV of the oscilloscope which will measure the response of the filter. If they exist, these drivers are on ni.com/idnet If they are correctly installed, the icons appear in the pallet of functions > > E/S instruments > > Drivers of instruments. 3/Programmer the generator of functions so that it generates a signal multitone, i.e. composed of certain component counts sinusoidal varying of 10Hz with 10MHz (according to the values which you wish). You will find in enclosures an example of VI which describes such a signal. 4/Charger the signal multitone in the buffer of the generator of functions. 5/Synchroniser the generation of the signal multitone with the acquisition of the signal of answer. The apparatuses used not being Ni, we do not have an example of VI which makes a this study exactly. Cordially
