It is single ended and when run by the software it is multiplexing all 16 adjacent channels.
I connect only first lets say the first three channels to signal sources by BNC cables; and the rest adjacent thirteen BNC inputs are not connected to anything i.e they are floating.
But the data I obtain at the end for the unconnected floating BNC channels have the same signal with the third channel. They copy the last connected channels's voltage signal.
How can this be explained?