I am a new Labview user, so some of this is a little overwhelming. I am using a cDAQ-9188 with several modules but the one I have having issues with is the 9411 that is being used to measure the speed off a torque meter.
I attached the program I set up. What I would like it to do is measure the number of edges over a 3 second interval so that I can divide by the number of pulses/revolution*60*1/3 to get rpm. However, the number of edges is not behaving in a linear fashion as I expected. I measured the speed of the shaft using a strobe light and graphed it vs. the number of edges. The results are attached on the excel file.
What am I missing? Should the number of edges not increase as I increase the speed of the shaft, or am I going about this all wrong and not measuring what I think I am?
Thanks in advance.