Square Wave Frequency

[Pete.Dunc]

Hey guys,

Having a bit of trouble with my LabVIEW project.  The project will be taking a square wave which changes level for every heartbeat, this VI was just to simulate the input.  The front panel, block diagram and error message are shown (sorry for the big pic!);

Without the "timing and transition measurements" tool the program generates the wave I require.  I'm needing to sample the input wave for 6 seconds and scale this up to get a value for beats per minute.  I'm pretty much a novice so any and all help is appreciated!!

Thanks in advance,

Peter

[Dennis_Knutson]

You should use a graph and not a chart to display what signal is being generated. You would have seen that with the parameters you are using, the error message makes all the sense in world because you are generating such a small segment of the square wave. The frequency is NOT being calculated from the history data in the chart.

p.s. Questions like this should be posted to the LabVIEW board. It has nothing to do with NI counter hardware.

[Pete.Dunc]

Thank you for your advice, I think I see what's going wrong. 

I have other issues with this project so I'll start a new thread on the right board!

Peter