I have the same problem. Same hardware of 6133 also, with bnc-2110. I want to capture a signal from channel ai0 using an external trigger source which is connected to PFI0. I doubt its my code as it is quite similar to the examples 204226.vi and 200007.vi supplied by the NI website, I always get the same error of Invalid Analog Trigger Source from all 3 VIs.
Anyone?