Hello everybody!
-I´m trying to acquire a voltage analog signal (high frequency content) by using a BNC 2110 connected to a bord NI USB-6251. I was informed in this Labview Forum that NI USB-6251 has no programmable analog lowpass filter (or anti-aliasing filter), so that I cannot avoid Aliasing during the digitization of my signals. For my application, the cutoff frequency of the analogue lowpass filter should be equal to 100 kHz or higher (maximum of 500 kHz). A possible solution to solve my problem, would be to work with an external analog lowpass filter before digitizing the voltage signal. Based on this I would like to know:
1) Does National Instruments develop such external analog filters? I need a filter which also presents an analog output, so that I could also send the analog lowpass filtered signal to my NI USB-6251 in order to appropriately digitize it!
2) What model of external lowpass filter would be compatible with NI USB-6251?
Any help would be highly appreciated!
Best regards!