Yes, as I've specified, I am trying 1000 samples per second.. I've tried from 100 to about 5000, I think.. very easy to duplicate, just put a simulated sine wave, and then try any of the timing measurement or pulse measurements VIs and set the freg to less than 15 hz or lower . seems the measurement VI times out if it doesn't see a cycle within a certain time frame (absolute). It doesn't seem related to samples .. I don't know ..
Dave
