Hi all,
I'm doing a college project and I've been working on a vi to measure the phase difference across an RC circuit. I excite a sine wave of approx. 2kHz from LabVIEW. I then measure the output with two analog inputs across the resistor. There has been an inconsistency in the results measured.
I know the actual phase difference to be 1.5 radians, however when I run the program I get a value ranging from 1.5 - 1.75 radians (this value varies each time the program is run but remains constant for each running). It could be down to mulitplexing delay but the error is not consistent so I don't know how to account for it.
It was suggested on the forums to try a lower level vi's and that's where I'm having big difficulties. I can't seem to get them working and have no experience with them.
Below is two vi's. The first my express and working vi. Second my "attempt" at converting it to traditional vi's.
Could someone please have a look at them and help me identify any problems I'm almost out of time for my project so I don't have much time for my usual trial an error approach)
I haven't been able to get to the lab over the Easter break so one question I would ask is can I select two analog input channels from this set up?
The last time I tried this set up I was receiving no data on any of the vi's within the loop. Not even on the measurement graph.
Kind Regards.
