DAQmx Trigger with Reference Analog Edge seems to require a minimum value of 2 for pretrigger samples per channel.
If correct, I do not see that mentioned in LabVIEW version 2017 Help nor DAQmx version 19.0
Other hardware configurations requiring a minimum value of 2 that I have experienced are related to clock ticks usage, for example with counter output pulse generation.
Originally posted to Multifunction DAQ board but no clarification provided there so posting here to LabVIEW board.
