I am working on an application where I need to acquire a given signal simultaneously on both channels A and B. I use a BNC splitter and BNC cables to connect to the digitizer. To test out the signal I apply a 5 V square wave on the split inputs.
I have noticed a discrepancy between the reading on both channels. Swapping the BNC inputs does not change the signals I am getting. I tried three 4227s, acquiring data using the SDK via LabVIEW, and also directly with Picoscope 6. Below is what I get:
I would expect the two channels to give me something very much identical unlike what I am seeing. Any idea?