Joey,
We only offer one SCXI module with VAC excitation, but the highest voltage it can give is 3 Vrms (1-3 Vrms) and in frequency from 2.5 to 10 kHz. You can take a look to it by going to the main page at www.ni.com, and then click on the link for "Product Catalog", then select "Products and Services" and select "Signal Conditioning"... then select "SCXI", then "SCXI Analog Input", and then on the select box that says "Signal Conditioning Feature" select "Excitation"...and then click on the "SCXI 1540" link... or follow this link as well...
SCXI 1540 Catalog Page In your case if you really need the 10VAC excitation, you most probably are going to need an external excitation source.
Good luck!...
Nestor Sanchez
Applications Engineer
National Instruments
Nestor