Hi. It seems to be DC coupled.
if you have one you can look in NI MAX test panel.
I have looked on the simulated one.
Thanks TIDAD. I don't have a physical 9223 yet (just trying to advise a customer whether it will do the required job) and I'm always a bit wary of virtual settings, but it does seem to be DC-coupled and that's what we're looking for, so I think we'll take a chance and order one.