Hi.. I have been trying for some time now to program a virtual oscilloscope using Labview software and the USB-6009 DAQ hardware. This has been my best attempt to date: http://www.andthenbam.com/FievelScope.vi I seem to only be able to measure frequencies up to 5 Hz, then signal frequencies begin to repeat themselves. I am aware that this device is capable of MUCH faster speeds. I would appreciate it if anyone could take a look at my VI and recommend a fix. Acquisition mode: 1 Sample (on demand) Buffer: 100 samples I have not been successful in getting any of the other acquisition modes to work. Please help! Here I am explaining my problem: http://www.youtube.com/watch?v=k8oI9mL8ZD4 Ty

Your problem is that you are setup to do a single sample on demand. This means that you are counting on the loop to set your acquisition rate. You likely actually want Continuous Samples with a rate that is much higher, depending on what you are trying to capture. It looks like you are trying to sample every 100ms. That is 10Hz. So based on Nyquist, 5Hz is the maximum frequency you can sample. Anything more than that will alias down into the 0-5Hz range.

LabVIEW

Virtual Oscilloscope; Slow Data Acquisition (5 Hz limit)

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Oh.. haha! Thanks for spelling it out for me.

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LabVIEW

Virtual Oscilloscope; Slow Data Acquisition (5 Hz limit)

Re: Virtual Oscilloscope; Slow Data Acquisition (5 Hz limit)