You should certainly be seeing that 1V ptp signal on that 2.5VDC
carrier without filtering. There are all kinds of external circuits you
could use to filter out the DC component, but it concerns me that
you're not seeing your AC signal at all currently. Could you possibly
post a screenshot of what you're seeing?
Regarding setting an offset in the FieldPoint AI module, currently
there's no way to go about that. In LabVIEW or any other language you
could simply subtract 2.5V from the value you're getting from your
FieldPoint Read to have it plot with a 0 V offset, but this isn't going
to change the resolution for your signal. Try posting a screenshot of
the output of your FieldPoint reads (I'm assuming you're going to a
chart or a graph). That may help us see what's going on.
LabVIEW Integration Engineer with experience in LabVIEW Real-Time, LabVIEW FPGA, DAQ, Machine Vision, as well as C/C++. CLAD, working on CLD and CLA.