Most Multifunction DAQ devices do not have differential AO.
Do you need accuacy or resolution? For most devices the accuracy is not as good as the resolution.
How fast do you need to update the outputs?
To get a resolution of 0.1 mV on a 10 V scale requires 1 part in 10^5, which is greater than 16 bits. The only NI devices I found with a quick search with higher resolution are the Dynamic Signal Acquisition devices. The NI 4461 (PCI or PXI) have 24 bit resolution and sample rates from 1 kS/s to 204.8 kS/s. It also has differential outputs. The accuracy is harder to evaluate because they only specify dynamic characteristics. It has a maximum DC offset of 1 mV (within 5 degrees and 24 hours of calibration). Look at the specifications carefully.
You should probably talk to your NI representative to get a thorough evaluation of whether this might be suitable for your needs.
Lynn
