Here's the short version of my question with probably a few built in assumptions:
I'm using an NI PCIe-6321 DAQ. I used a signal generator to send a 10 V square wave and measured through an AI channel on the DAQ. The result shows the signal going from very near zero (~0.07 V) to 10.75 V, not 10 V. Why?
Longer version: I took measurements using a torque transducer with a Data Translation DAQ and a different computer a while back. The measurements matched theory well, so I trust them. Fast forward, I repeat with this new NI DAQ and a new computer, and there's about a factor of two difference in the results. Since I have theory to compare to, I don't trust the NI results. I simultaneously recorded on the old set up just as above and the DT DAQ shows a ~0.07 to 10 V square wave. In other words, same minimum, different maximum. What's going on?