Vianney,
The following links will give you more information on FieldPoint and sampling rates.
http://zone.ni.com/devzone/conceptd.nsf/webmain/2124F6BBD29663D886256CB80054DBD7
http://zone.ni.com/devzone/conceptd.nsf/webmain/A14D3C3314A0E24A86256DBE00664943
http://forums.ni.com/ni/board/message?board.id=110&message.id=455&requireLogin=False
http://forums.ni.com/ni/board/message?board.id=110&message.id=1681&requireLogin=False
Regards,
Aaron
LabVIEW Champion, CLA, CPI